Sciences and Exploration Directorate

Brief Bio


Assistant Astronomer, University of Chicago, Yerkes Observatory 1970-1972
Assistant Astronomer, Kitt Peak National Observatory, Tucson, AZ 1972-1975
Principal Engineer, Lockheed Electronics, Houston, TX 1975-1977
Astronomer, GSFC 1977-Present
Associate Chief, Laboratory for Astronomy and Solar Physics 1983-1993
Mission Scientist, Astro-1, 1982-1992
Deputy Principal Investigator, Space Telescope Imaging Spectrograph, 1984-2009

Current Projects


Observational studies of Eta Carinae and the Homunculus coupled with modeling the massive binary winds and modeling the massive ejecta. Atomic/molecular spectroscopy of Eta Carinae with Herschel, HST, VLT. Searching for missing mass in the Crab SNR.

Stars

Ongoing observations with HST, CHANDRA, Herschel, ESO's VLT and other facilities. Several collaborations leading to modeling which includes 3D wind-wind interaction studies with smoothed particle hydrodynamics, radiation transfer; atomic, molecular and dust evolution of the expanding Homunculus and Little Homunculus.

Positions/Employment


Astrophysicist

NASA/GSFC - Greenbelt, MD

June 1977 - Present


Education


BS Physics, MIT 1966
PhD Astrophysics, Cornell, 1971
XMBA, Loyola College, 1985

Professional Societies


American Astronomical Society

1967 - Present


International Astronomical Union

1975 - Present


Astronomical Society of the Pacific

1973 - Present


Royal Astronomical Society of Canada

2007 - Present

Professional Service


Member, multiple thesis examination committees.
Member, multiple NASA and NSF review panels.
Member, advisory committe for Native American Tribal Colleges

Awards


Goddard Award of Merit

ScD, South Dakota School of Mines and Technology

NASA Exceptional Achievement Medal 1992

NASA Equal Opportunity Medal 1998

HST National Resource Award, Group Achievement Award, 1999

STIS Servicing Mission Group Achievement Award, 1998

Honored Guest – Black Hills Powwow 2005

Grants


Currently a half dozen grants active. Several dozen in the past decade

HST, Herschel, CHANDRA Observing programs - NASA, STScI - Awarded: 2012-11-29


Dates:  - 

Publications


Refereed

Cordiner, M. A., H. Linnartz, N. L. Cox, et al. J. Cami, F. Najarro, C. R. Proffitt, R. Lallement, P. Ehrenfreund, B. H. Foing, T. R. Gull, P. J. Sarre, and S. B. Charnley. 2019. Confirming Interstellar C60 + Using the Hubble Space Telescope The Astrophysical Journal 875 (2): L28 [10.3847/2041-8213/ab14e5]

Cordiner, M. A., N. L. Cox, R. Lallement, et al. F. Najarro, J. Cami, T. R. Gull, B. H. Foing, H. Linnartz, D. J. Lindler, C. R. Proffitt, P. J. Sarre, and S. B. Charnley. 2017. Searching for Interstellar C60+ Using a New Method for High Signal-to-noise HST/STIS Spectroscopy The Astrophysical Journal 843 (1): L2 [10.3847/2041-8213/aa78f7]

Corcoran, M. F., J. Liburd, D. Morris, et al. C. M. Russell, K. Hamaguchi, T. R. Gull, T. I. Madura, M. Teodoro, A. F. Moffat, N. D. Richardson, D. J. Hillier, A. Damineli, and J. H. Groh. 2017. The 2014 X-Ray Minimum of η Carinae as Seen by Swift The Astrophysical Journal 838 (1): 45 [10.3847/1538-4357/aa6347]

Weigelt, G., K.-H. Hofmann, D. Schertl, et al. N. Clementel, M. F. Corcoran, A. Damineli, W.-J. de Wit, R. Grellmann, J. Groh, S. Guieu, T. Gull, M. Heininger, D. J. Hillier, C. A. Hummel, S. Kraus, T. Madura, A. Mehner, A. Mérand, F. Millour, A. F. Moffat, K. Ohnaka, F. Patru, R. G. Petrov, S. Rengaswamy, N. D. Richardson, T. Rivinius, M. Schöller, M. Teodoro, and M. Wittkowski. 2016. VLTI-AMBER velocity-resolved aperture-synthesis imaging of η Carinae with a spectral resolution of 12 000 Astronomy & Astrophysics 594 A106 [10.1051/0004-6361/201628832]

Richardson, N. D., T. I. Madura, L. St-Jean, et al. A. F. Moffat, T. R. Gull, C. M. Russell, A. Damineli, M. Teodoro, M. F. Corcoran, F. M. Walter, N. Clementel, J. H. Groh, K. Hamaguchi, and D. J. Hillier. 2016. To v_∞ and beyond! The He I absorption variability across the 2014.6 periastron passage of η Carinae Monthly Notices of the Royal Astronomical Society 461 (3): 2540-2558 [10.1093/mnras/stw1415]

Madura, T. I., T. R. Gull, S. P. Owocki, et al. J. H. Groh, A. T. Okazaki, and C. M. Russell. 2012. Constraining the absolute orientation of η Carinae’s binary orbit: a 3D dynamical model for the broad [Fe iii] emission★ Monthly Notices of the Royal Astronomical Society 420 (3): 2064-2086 [10.1111/j.1365-2966.2011.20165.x]

Madura, T. I., T. R. Gull, S. P. Owocki, A. T. Okazaki, and C. M. Russell. 2011. Constraining the Properties of the Eta Carinae System via 3-D SPH Models of Space-Based Observations: The Absolute Orientation of the Binary Orbit SociŽtŽ Royale des Sciences de Li?ge, Bulletin, vol 80, p 694-698 (Proceedings of the 39th Li?ge Astrophysical Colloquium, held in Li?ge 12-16 July 2010, edited by G Rauw, M De Becker, Y NazŽ, J-M Vreux, P Williams) 80 694

Bautista, M. A., M. MelŽndez, H. Hartman, T. R. Gull, and K. Lodders. 2011. The abundance of iron-peak elements and the dust composition in _ Carinae: manganese Monthly Notices of the Royal Astronomical Society 410 2643 [10.1111/j.1365-2966.2010.17642.x]

Oegerle, W. R., L. Feinberg, L. Purves, et al. T. Hyde, H. Thronson, J. Townsend, M. Postman, M. Bolcar, J. Budinoff, B. Dean, M. Clampin, D. Ebbets, Q. Gong, T. Gull, J. Howard, A. Jones, R. Lyon, B. Pasquale, C. Perrygo, S. Smith, P. Thompson, and B. Woodgate. 2010. ATLAST-9.2: A Deployable Large Aperture UVOIR Space Telescope American Astronomical Society, AAS Meeting #215, #48002; Bulletin of the American Astronomical Society, Vol 42, p569 215 569

Oegerle, W. R., L. D. Feinberg, L. R. Purves, et al. T. T. Hyde, H. A. Thronson, J. A. Townsend, M. Postman, M. R. Bolcar, J. G. Budinoff, B. H. Dean, M. C. Clampin, D. C. Ebbets, Q. Gong, T. R. Gull, J. M. Howard, A. L. Jones, R. G. Lyon, B. A. Pasquale, C. Perrygo, J. S. Smith, P. L. Thompson, and B. E. Woodgate. 2010. ATLAST-9.2m: a large-aperture deployable space telescope Space Telescopes and Instrumentation 2010: Optical, Infrared, and Millimeter Wave Edited by Oschmann, Jacobus M, Jr; Clampin, Mark C; MacEwen, Howard A Proceedings of the SPIE 7731 81 [10.1117/12.857622]

Groh, J. H., K. E. Nielsen, A. Damineli, et al. T. R. Gull, T. I. Madura, D. J. Hillier, M. Teodoro, T. Driebe, G. Weigelt, H. Hartman, F. Kerber, A. T. Okazaki, S. P. Owocki, F. Millour, K. Murakawa, S. Kraus, K. Hofmann, and D. Schertl. 2010. Detection of high-velocity material from the wind-wind collision zone of Eta Carinae across the 2009.0 periastron passage Astronomy and Astrophysics 517 (A9): 17pp [10.1051/0004-6361/200913937]

Bruhweiler, F. C., R. Freire Ferrero, M. O. Bourdin, and T. R. Gull. 2010. The Young Interstellar Bubble Within the Rosette Nebula The Astrophysical Journal 719 1872 [10.1088/0004-637X/719/2/1872]

Nielsen, K. E., G. V. Kober, K. Weis, et al. T. R. Gull, O. Stahl, and D. J. Bomans. 2009. Eta Carinae Across the 20035 Minimum: Analysis in the Visible and Near-Infrared Spectral Region The Astrophysical Journal Supplement 181 473 [10.1088/0067-0049/181/2/473]

Bautista, M. A., C. Ballance, T. R. Gull, et al. H. Hartman, K. Lodders, M. Martínez, and M. B. Melendez. 2009. Scandium and chromium in the strontium filament in the Homunculus of η Carinae Monthly Notices of the Royal Astronomical Society 393 1503 [10.1111/j.1365-2966.2008.14246.x]

Nielsen, K. E., and T. R. Gull. 2009. Eta Carinae: an Astrophysical Laboratory Physica Scripta 134 4002 [10.1088/0031-8949/2009/T134/014002]

Gull, T. R., K. E. Nielsen, M. F. Corcoran, et al. T. I. Madura, S. P. Owocki, C. M. Russell, D. J. Hillier, K. Hamaguchi, G. V. Kober, K. Weis, O. Stahl, and A. T. Okazaki. 2009. The extended interacting wind structure of Eta Carinae Monthly Notices of the Royal Astronomical Society 396 1308 [10.1111/j.1365-2966.2009.14854.x]

Gull, T. R. 2009. The Variable 6307 Å Emission Line in the Spectrum of Eta Carinae: Blueshifted [S III] λ6313 from the Interacting Winds The Publications of the Astronomical Society of the Pacific 121 1213 [10.1086/648537]

Henley, D. B., M. F. Corcoran, J. M. Pittard, et al. I. R. Stevens, K. Hamaguchi, and T. R. Gull. 2008. Chandra X‐Ray Grating Spectrometry of η Carinae near X‐Ray Minimum. I. Variability of the Sulfur and Silicon Emission Lines The Astrophysical Journal 680 (1): 705-727 [10.1086/587472]

Hagen Bauer, W., T. R. Gull, and P. D. Bennett. 2008. Spatial Extension in the Ultraviolet Spectrum of VV Cephei The Astronomical Journal 136 1312 [10.1088/0004-6256/136/3/1312]

Nielsen, K. E., M. F. Corcoran, T. R. Gull, et al. D. J. Hillier, K. Hamaguchi, S. Ivarsson, and D. J. Lindler. 2007. η Carinae across the 2003.5 Minimum: Spectroscopic Evidence for Massive Binary Interactions The Astrophysical Journal 660 (1): 669-686 [10.1086/513006]

Nielsen, K. E., S. Ivarsson, and T. R. Gull. 2007. Eta Carinae across the 20035 Minimum: Deciphering the Spectrum toward Weigelt D The Astrophysical Journal Supplement Series 168 289 [10.1086/509785]

Walborn, N. R., N. Smith, I. D. Howarth, et al. G. Vieira Kober, T. R. Gull, and J. A. Morse. 2007. Interstellar Absorption-Line Evidence for High-Velocity Expanding Structures in the Carina Nebula Foreground The Publications of the Astronomical Society of the Pacific 119 156 [10.1086/511756]

Weigelt, G., S. Kraus, T. Driebe, et al. R. G. Petrov, K. Hofmann, F. Millour, O. Chesneau, D. Schertl, F. Malbet, J. D. Hillier, T. R. Gull, K. Davidson, A. Domiciano de Souza, P. Antonelli, U. Beckmann, Y. Bresson, A. Chelli, M. Dugué, G. Duvert, S. Gennari, L. Glück, P. Kern, S. Lagarde, E. Le Coarer, F. Lisi, K. Perraut, P. Puget, F. Rantakyrö, S. Robbe-Dubois, A. Roussel, E. Tatulli, G. Zins, M. Accardo, B. Acke, K. Agabi, E. Altariba, B. Arezki, E. Aristidi, C. Baffa, J. Behrend, T. Blöcker, S. Bonhomme, S. Busoni, F. Cassaing, J. Clausse, J. Colin, C. Connot, A. Delboulbé, P. Feautrier, D. Ferruzzi, T. Forveille, E. Fossat, R. Foy, D. Fraix-Burnet, A. Gallardo, E. Giani, C. Gil, A. Glentzlin, M. Heiden, M. Heininger, O. Hernandez Utrera, D. Kamm, M. Kiekebusch, D. Le Contel, J. Le Contel, T. Lesourd, B. Lopez, M. Lopez, Y. Magnard, A. Marconi, G. Mars, G. Martinot-Lagarde, P. Mathias, P. Mège, J. Monin, D. Mouillet, D. Mourard, E. Nussbaum, K. Ohnaka, J. Pacheco, C. Perrier, Y. Rabbia, S. Rebattu, F. Reynaud, A. Richichi, A. Robini, M. Sacchettini, M. Schöller, W. Solscheid, A. Spang, P. Stee, P. Stefanini, M. Tallon, I. Tallon-Bosc, D. Tasso, L. Testi, F. Vakili, O. von der Lühe, J. Valtier, M. Vannier, N. Ventura, K. Weis, and M. Wittkowski. 2007. Near-infrared interferometry of η Carinae with spectral resolutions of 1 500 and 12 000 using AMBER/VLTI Astronomy and Astrophysics 464 87 [10.1051/0004-6361:20065577]

Hamaguchi, K., M. F. Corcoran, T. R. Gull, et al. K. Ishibashi, J. M. Pittard, D. J. Hillier, A. Damineli, K. Davidson, K. E. Nielsen, and G. V. Kober. 2007. X-Ray Spectral Variation of η Carinae through the 2003 X-Ray Minimum The Astrophysical Journal 663 522 [10.1086/518101]

Gull, T. R., G. V. Kober, and K. E. Nielsen. 2006. Eta Carinae across the 20035 Minimum: The Character and Variability of the Ejecta Absorption in the Near-Ultraviolet The Astrophysical Journal Supplement Series 163 173 [10.1086/500113]

Fruchter, A. S., A. J. Levan, L. Strolger, et al. P. M. Vreeswijk, S. E. Thorsett, D. Bersier, I. Burud, J. M. Castro Cerón, A. J. Castro-Tirado, C. Conselice, T. Dahlen, H. C. Ferguson, J. P. Fynbo, P. M. Garnavich, R. A. Gibbons, J. Gorosabel, T. R. Gull, J. Hjorth, S. T. Holland, C. Kouveliotou, Z. Levay, M. Livio, M. R. Metzger, P. E. Nugent, L. Petro, E. Pian, J. E. Rhoads, A. G. Riess, K. C. Sahu, A. Smette, N. R. Tanvir, R. A. Wijers, and S. E. Woosley. 2006. Long γ-ray bursts and core-collapse supernovae have different environments Nature 441 463 [10.1038/nature04787]

Bautista, M. A., H. Hartman, T. R. Gull, N. Smith, and K. Lodders. 2006. [TiII] and [NiII] emission from the strontium filament of η Carinae Monthly Notices of the Royal Astronomical Society 370 1991 [10.1111/j.1365-2966.2006.10624.x]

Kraemer, S. B., D. M. Crenshaw, J. R. Gabel, et al. G. A. Kriss, H. Netzer, B. M. Peterson, I. M. George, T. R. Gull, J. B. Hutchings, R. F. Mushotzky, and T. J. Turner. 2006. Simultaneous Ultraviolet and X‐Ray Observations of the Seyfert Galaxy NGC 4151. II. Physical Conditions in the UV Absorbers The Astrophysical Journal Supplement Series 167 (2): 161-176 [10.1086/508629]

Hillier, D. J., T. R. Gull, K. E. Nielsen, et al. G. Sonneborn, R. C. Iping, N. Smith, M. F. Corcoran, A. Damineli, F. W. Hamann, J. C. Martin, and K. Weis. 2006. The UV Scattering Halo of the Central Source Associated with η Carinae The Astrophysical Journal 642 1098 [10.1086/501225]

Kober, G. V., T. R. Gull, K. Nielsen, et al. F. Bruhweiler, K. Verner, O. Stahl, K. Weis, and D. Bomans. 2005. Elemental and Molecular Relative Abundances in the Ejecta of Eta Carinae Bulletin of the American Astronomical Society 37 #114.09-

Grady, C., B. Woodgate, C. Bowers, et al. T. Gull, L. Sitko, and L. Sitko. 2005. Coronagraphic Imaging of Pre-Main-Sequence Stars with the Hubble Space Telescope Space Telescope Imaging Spectrograph. I. The Herbig Ae Stars The Astrophysical Journal 630 958 [10.1086/430731]

Ruiz, J. R., D. M. Crenshaw, S. B. Kraemer, et al. G. A. Bower, T. R. Gull, J. B. Hutchings, M. E. Kaiser, and D. Weistrop. 2005. Probing the Kinematics of the Narrow-Line Region in Seyfert Galaxies with Slitless Spectroscopy: Observational Results The Astronomical Journal 129 73 [10.1086/426372]

Davidson, K., J. Martin, R. M. Humphreys, et al. K. Ishibashi, T. R. Gull, O. Stahl, K. Weis, D. J. Hillier, A. Damineli, M. Corcoran, and F. Hamann. 2005. A Change in the Physical State of ? Carinae? The Astronomical Journal 129 900 [10.1086/427132]

Gull, T. R., G. Vieira, F. C. Bruhweiler, et al. K. E. Nielsen, E. M. Verner, and A. Danks. 2005. The Absorption Spectrum of High-Density Stellar Ejecta in the Line of Sight to η Carinae The Astrophysical Journal 620 442 [10.1086/426885]

Weis, K., O. Stahl, D. J. Bomans, et al. K. Davidson, T. R. Gull, and R. M. Humphreys. 2005. VLT UVES Observations of the Balmer Line Variations of η Carinae during the 2003 Spectroscopic Event The Astronomical Journal 129 1694 [10.1086/428005]

Nielsen, K. E., T. R. Gull, and G. Vieira Kober. 2005. The Ultraviolet Spectrum of η Carinae: Investigation of the Ejecta Absorption The Astrophysical Journal Supplement Series 157 138 [10.1086/427437]

Stahl, O., K. Weis, D. J. Bomans, et al. K. Davidson, T. R. Gull, and R. M. Humphreys. 2005. A spectroscopic event of η Car viewed from different directions: The data and first results Astronomy and Astrophysics 435 303 [10.1051/0004-6361:20042547]

Johansson, S., T. R. Gull, H. Hartman, and V. S. Letokhov. 2005. Metastable hydrogen absorption in ejecta close to η Carinae Astronomy and Astrophysics 435 183 [10.1051/0004-6361:20041193]

Verner, E. M., F. C. Bruhweiler, and T. R. Gull. 2005. The Binarity of η Carinae Revealed from Photoionization Modeling of the Spectral Variability of the Weigelt Blobs B and D The Astrophysical Journal 624 973 [10.1086/429400]

Verner, E. M., F. C. Bruhweiler, K. E. Nielsen, et al. T. R. Gull, G. Vieira Kober, and M. F. Corcoran. 2005. Discovery of CH and OH in the -513 km s-1 Ejecta of η Carinae The Astrophysical Journal 629 1034 [10.1086/431917]

Shibanov, Y. A., J. Sollerman, P. Lundqvist, T. Gull, and D. Lindler. 2005. The near-UV pulse profile and spectrum of the pulsar PSR B0656+14 Astronomy and Astrophysics 440 693 [10.1051/0004-6361:20052987]

Das, V., D. M. Crenshaw, J. B. Hutchings, et al. R. P. Deo, S. B. Kraemer, T. R. Gull, M. E. Kaiser, C. H. Nelson, and D. Weistrop. 2005. Mapping the Kinematics of the Narrow-Line Region in the Seyfert Galaxy NGC 4151 The Astronomical Journal 130 945 [10.1086/432255]

Bender, R., J. Kormendy, G. Bower, et al. R. Green, J. Thomas, A. C. Danks, T. Gull, J. B. Hutchings, C. L. Joseph, M. E. Kaiser, T. R. Lauer, C. H. Nelson, D. Richstone, D. Weistrop, and B. Woodgate. 2005. HST STIS Spectroscopy of the Triple Nucleus of M31: Two Nested Disks in Keplerian Rotation around a Supermassive Black Hole The Astrophysical Journal 631 280 [10.1086/432434]

Kraemer, S. B., I. M. George, D. M. Crenshaw, et al. J. R. Gabel, T. J. Turner, T. R. Gull, J. B. Hutchings, G. A. Kriss, R. F. Mushotzky, H. Netzer, B. M. Peterson, and E. Behar. 2005. Simultaneous Ultraviolet and X‐Ray Observations of Seyfert Galaxy NGC 4151. I. Physical Conditions in the X‐Ray Absorbers The Astrophysical Journal 633 (2): 693-705 [10.1086/466522]

Grady, C. A., B. E. Woodgate, C. W. Bowers, et al. T. R. Gull, M. L. Sitko, W. J. Carpenter, D. K. Lynch, R. W. Russell, R. B. Perry, G. M. Williger, A. Roberge, J. Bouret, and M. Sahu. 2005. Coronagraphic Imaging of Pre–Main‐Sequence Stars with the Hubble Space Telescope Space Telescope Imaging Spectrograph. I. The Herbig Ae Stars The Astrophysical Journal 630 (2): 958-975 [10.1086/430731]

Iping, R. C., G. Sonneborn, T. R. Gull, D. L. Massa, and D. J. Hillier. 2005. Detection of a Hot Binary Companion of η Carinae The Astrophysical Journal 633 L37 [10.1086/498268]

Smith, N., J. A. Morse, T. R. Gull, et al. D. J. Hillier, R. D. Gehrz, N. R. Walborn, M. Bautista, N. R. Collins, M. F. Corcoran, A. Damineli, F. Hamann, H. Hartman, S. Johansson, O. Stahl, and K. Weis. 2004. Kinematics and Ultraviolet to Infrared Morphology of the Inner Homunculus of η Carinae The Astrophysical Journal 605 405 [10.1086/382185]

Cohen, M., H. Van Winckel, H. E. Bond, and T. R. Gull. 2004. Hubble Space Telescope Imaging of HD 44179, The Red Rectangle The Astronomical Journal 127 2362 [10.1086/382902]

Hartman, H., T. Gull, S. Johansson, N. Smith, and H. E. . 2004. Identification of emission lines in the low-ionization strontium filament near Eta Carinae Astronomy and Astrophysics, v419, p215-224 (2004) 419 215 [10.1051/0004-6361:20035647]

Smith, N., J. A. Morse, N. R. Collins, and T. R. Gull. 2004. The Purple Haze of ? Carinae: Binary-induced Variability? The Astrophysical Journal 610 L105 [10.1086/423341]

Verner, E., F. Bruhweiler, D. Verner, et al. S. Johansson, T. Kallman, and T. Gull. 2004. Fe II Diagnostic Tools for Quasars The Astrophysical Journal 611 780 [10.1086/422303]

Corcoran, M. F., K. Hamaguchi, T. Gull, et al. K. Davidson, R. Petre, D. J. Hillier, N. Smith, A. Damineli, J. A. Morse, N. R. Walborn, E. Verner, N. Collins, S. White, J. M. Pittard, K. Weis, D. Bomans, and Y. Butt. 2004. Waiting in the Wings: Reflected X-Ray Emission from the Homunculus Nebula The Astrophysical Journal 613 381 [10.1086/423024]

Chu, Y., R. A. Gruendl, R. M. Williams, T. R. Gull, and K. Werner. 2004. The Nebular Environment and Enigmatic Hard X-Ray Emission of the Hot DO White Dwarf KPD 0005+5106 The Astronomical Journal 128 2357 [10.1086/424942]

Proffitt, C. R., K. Sahu, M. Livio, et al. J. Krist, D. Calzetti, R. Gilliland, C. A. Grady, D. Lindler, B. E. Woodgate, S. R. Heap, M. Clampin, T. R. Gull, and C. M. Lisse. 2004. Limits on the Optical Brightness of the ε Eridani Dust Ring The Astrophysical Journal 612 481 [10.1086/422549]

Hartman, H., A. Derkatch, M. P. Donnelly, et al. T. Gull, A. Hibbert, S. Johansson, H. Lundberg, S. Mannervik, L. Norlin, D. Rostohar, P. Royen, and P. Schef. 2003. The FERRUM Project: Experimental transition probabilities of [Fe II] and astrophysical applications Astronomy and Astrophysics, v397, p1143-1149 (2003) 397 1143 [10.1051/0004-6361:20021557]

Smith, N., K. Davidson, T. R. Gull, K. Ishibashi, and D. J. Hillier. 2003. Latitude-dependent Effects in the Stellar Wind of η Carinae The Astrophysical Journal 586 432 [10.1086/367641]

Verner, E., F. Bruhweiler, D. Verner, S. Johansson, and T. Gull. 2003. Revisited Abundance Diagnostics in Quasars: Fe II/Mg II Ratios The Astrophysical Journal 592 L59 [10.1086/377571]

Grady, C. A., C. R. Proffitt, E. Malumuth, et al. B. E. Woodgate, T. R. Gull, C. W. Bowers, S. R. Heap, R. A. Kimble, D. Lindler, P. Plait, and A. Weinberger. 2003. Coronagraphic Imaging with the Hubble Space Telescope and the Space Telescope Imaging Spectrograph The Publications of the Astronomical Society of the Pacific 115 1036 [10.1086/377083]

Malumuth, E. M., R. S. Hill, T. Gull, et al. B. E. Woodgate, C. W. Bowers, R. A. Kimble, D. Lindler, P. Plait, and M. Blouke. 2003. Removing the Fringes from Space Telescope Imaging Spectrograph Slitless Spectra The Publications of the Astronomical Society of the Pacific 115 218 [10.1086/345913]

Ishibashi, K., T. R. Gull, K. Davidson, et al. N. Smith, T. Lanz, D. J. Lindler, K. Feggans, E. M. Verner, B. E. Woodgate, R. A. Kimble, C. W. Bowers, S. B. Kraemer, S. R. Heap, A. C. Danks, S. P. Maran, C. L. Joseph, M. E. Kaiser, J. L. Linsky, F. Roesler, and D. Weistrop. 2003. Discovery of a Little Homunculus within the Homunculus Nebula of η Carinae The Astronomical Journal 125 3222 [10.1086/375306]

Corcoran, M., J. H. Swank, K. Ishibashi, et al. T. Gull, R. Humphreys, A. Damineli, N. Walborn, D. J. Hillier, K. Davidson, S. M. White, R. Petre, J. Pittard, Y. Butt, and K. Verner. 2002. Recent X-ray Variability of Eta Car Approaching The X-ray Eclipse Bulletin of the American Astronomical Society 34 1184-

Bautista, M. A., T. R. Gull, K. Ishibashi, H. Hartman, and K. Davidson. 2002. Excitation of Srii lines in Eta Carinae Monthly Notices of the Royal Astronomical Society 331 875 [10.1046/j.1365-8711.2002.05250.x]

Van Winckel, H., M. Cohen, and T. R. Gull. 2002. The ERE of the ``Red Rectangle" revisited Astronomy and Astrophysics, v390, p147-154 (2002) 390 147 [10.1051/0004-6361:20020623]

Hutchings, J. B., D. M. Crenshaw, S. B. Kraemer, et al. J. R. Gabel, M. E. Kaiser, D. Weistrop, and T. R. Gull. 2002. Balmer and He I Absorption in the Nuclear Spectrum of NGC 4151 The Astronomical Journal 124 2543 [10.1086/344080]

King, N. L., A. Nota, J. R. Walsh, et al. N. Panagia, T. R. Gull, A. Pasquali, M. Clampin, and L. E. Bergeron. 2002. A Hubble Space Telescope Polarization Study of Dust in the η Carinae Homunculus The Astrophysical Journal 581 285 [10.1086/344168]

Verner, E. M., T. R. Gull, F. C. Bruhweiler, et al. S. Johansson, K. Ishibashi, and K. Davidson. 2002. The Origin of Fe II and [Fe II] Emission Lines in the 4000-10000 Å Range in the BD Weigelt Blobs of η Carinae The Astrophysical Journal 581 1154 [10.1086/344443]

Tripp, T. M., E. B. Jenkins, G. M. Williger, et al. S. R. Heap, C. W. Bowers, A. C. Danks, R. Davé, R. F. Green, T. R. Gull, C. L. Joseph, M. E. Kaiser, D. J. Lindler, R. J. Weymann, and B. E. Woodgate. 2002. The Heavy-Element Enrichment of Lyα Clouds in the Virgo Supercluster The Astrophysical Journal 575 697 [10.1086/341338]

Davidson, K., N. Smith, T. R. Gull, K. Ishibashi, and D. J. Hillier. 2001. The Shape and Orientation of the Homunculus Nebula Based on Spectroscopic Velocities The Astronomical Journal 121 1569 [10.1086/319419]

Bower, G. A., R. F. Green, R. Bender, et al. K. Gebhardt, T. R. Lauer, J. Magorrian, D. O. Richstone, A. Danks, T. Gull, J. Hutchings, C. Joseph, M. E. Kaiser, D. Weistrop, B. Woodgate, C. Nelson, and E. M. Malumuth. 2001. Evidence of a Supermassive Black Hole in the Galaxy NGC 1023 from the Nuclear Stellar Dynamics The Astrophysical Journal 550 75 [10.1086/319730]

Joseph, C. L., D. Merritt, R. Olling, et al. M. Valluri, R. Bender, G. Bower, A. Danks, T. Gull, J. Hutchings, M. E. Kaiser, S. Maran, D. Weistrop, B. Woodgate, E. Malumuth, C. Nelson, P. Plait, and D. Lindler. 2001. The Nuclear Dynamics of M32. I. Data and Stellar Kinematics The Astrophysical Journal 550 (2): 668-690 [10.1086/319781]

Kraemer, S. B., D. M. Crenshaw, J. B. Hutchings, et al. I. M. George, A. C. Danks, T. R. Gull, M. E. Kaiser, C. H. Nelson, D. Weistrop, and G. L. Vieira. 2001. Space Telescope Imaging Spectrograph Echelle Observations of the Seyfert Galaxy NGC 4151: Physical Conditions in the Ultraviolet Absorbers The Astrophysical Journal 551 671 [10.1086/320244]

Gull, T. R. 2001. η Carinae and Other Mysterious Stars: Hidden Opportunities for Emission Spectroscopy The Publications of the Astronomical Society of the Pacific 113 512 [10.1086/319539]

Hillier, D. J., K. Davidson, K. Ishibashi, and T. R. Gull. 2001. On the Nature of the Central Source in η Carinae The Astrophysical Journal 553 837 [10.1086/320948]

Smette, A., A. S. Fruchter, T. R. Gull, et al. K. C. Sahu, L. Petro, H. Ferguson, J. Rhoads, D. J. Lindler, R. Gibbons, D. W. Hogg, C. Kouveliotou, M. Livio, D. Macchetto, M. R. Metzger, H. Pedersen, E. Pian, S. E. Thorsett, R. A. Wijers, J. P. Fynbo, J. Gorosabel, J. Hjorth, B. L. Jensen, A. Levine, D. A. Smith, T. Cline, K. Hurley, and J. Trombka. 2001. Hubble Space Telescope STIS Observations of GRB 000301C: CCD Imaging and Near-Ultraviolet MAMA Spectroscopy The Astrophysical Journal 556 70 [10.1086/321585]

Zethson, T., T. R. Gull, H. Hartman, et al. S. Johansson, K. Davidson, and K. Ishibashi. 2001. Sr II and [Sr II] Emission in the Ejecta of η Carinae The Astronomical Journal 122 322 [10.1086/321119]

Gebhardt, K., T. R. Lauer, J. Kormendy, et al. J. Pinkney, G. A. Bower, R. Green, T. Gull, J. B. Hutchings, M. E. Kaiser, C. H. Nelson, D. Richstone, and D. Weistrop. 2001. M33: A Galaxy with No Supermassive Black Hole The Astronomical Journal 122 2469 [10.1086/323481]

Ruiz, J. R., D. M. Crenshaw, S. B. Kraemer, et al. G. A. Bower, T. R. Gull, J. B. Hutchings, M. E. Kaiser, and D. Weistrop. 2001. Kinematics of the Narrow-Line Region in the Seyfert 2 Galaxy Markarian 3 The Astronomical Journal 122 2961 [10.1086/323917]

Grady, C. A., E. F. Polomski, T. Henning, et al. B. Stecklum, B. E. Woodgate, C. M. Telesco, R. K. Piña, T. R. Gull, A. Boggess, C. W. Bowers, F. C. Bruhweiler, M. Clampin, A. C. Danks, R. F. Green, S. R. Heap, J. B. Hutchings, E. B. Jenkins, C. Joseph, M. E. Kaiser, R. A. Kimble, S. Kraemer, D. Lindler, J. L. Linsky, S. P. Maran, H. W. Moos, P. Plait, F. Roesler, J. G. Timothy, and D. Weistrop. 2001. The Disk and Environment of the Herbig Be Star HD 100546 The Astronomical Journal 122 3396 [10.1086/324447]

Kaiser, M. E., L. D. Bradley, J. B. Hutchings, et al. D. M. Crenshaw, T. R. Gull, S. B. Kraemer, C. H. Nelson, J. Ruiz, and D. Weistrop. 2000. The Resolved Narrow-Line Region in NGC 4151 The Astrophysical Journal 528 260 [10.1086/308143]

Nelson, C. H., D. Weistrop, J. B. Hutchings, et al. D. M. Crenshaw, T. R. Gull, M. E. Kaiser, S. B. Kraemer, and D. Lindler. 2000. Space Telescope Imaging Spectrograph Long-Slit Spectroscopy of the Narrow-Line Region of NGC 4151 I Kinematics and Emission-Line Ratios The Astrophysical Journal 531 257 [10.1086/308456]

Davidson, K., K. Ishibashi, T. R. Gull, R. M. Humphreys, and N. Smith. 2000. η Carinae: Testing a Binary Orbit Model with the Hubble Space Telescope/Space Telescope Imaging Spectrograph The Astrophysical Journal 530 L107 [10.1086/312502]

Kraemer, S. B., D. M. Crenshaw, J. B. Hutchings, et al. T. R. Gull, M. E. Kaiser, C. H. Nelson, and D. Weistrop. 2000. Space Telescope Imaging Spectrograph Long-Slit Spectroscopy of the Narrow-Line Region of NGC 4151 II Physical Conditions along Position Angle 221 deg The Astrophysical Journal 531 278 [10.1086/308457]

Bower, G. A., R. F. Green, A. C. Quillen, et al. A. Danks, T. Gull, J. Hutchings, C. Joseph, M. E. Kaiser, D. Weistrop, B. Woodgate, E. M. Malumuth, and C. Nelson. 2000. The Ionization Source in the Nucleus of M84 The Astrophysical Journal 534 189 [10.1086/308741]

Johansson, S., T. Zethson, H. Hartman, et al. J. O. Ekberg, K. Ishibashi, K. Davidson, and T. Gull. 2000. New forbidden and fluorescent Fe III lines identified in HST spectra of eta Carinae Astronomy and Astrophysics, v361, p977-981 (2000) 361 977

Crenshaw, D. M., S. B. Kraemer, J. B. Hutchings, et al. L. D. Bradley, T. R. Gull, M. E. Kaiser, C. H. Nelson, J. R. Ruiz, and D. Weistrop. 2000. A Kinematic Model for the Narrow-Line Region in NGC 4151 The Astronomical Journal 120 1731 [10.1086/301574]

Crenshaw, D. M., S. B. Kraemer, J. B. Hutchings, et al. A. C. Danks, T. R. Gull, M. E. Kaiser, C. H. Nelson, and D. Weistrop. 2000. Space Telescope Imaging Spectrograph Echelle Observations of NGC 4151: Variable Ionization of the Intrinsic UV Absorbers The Astrophysical Journal 545 L27 [10.1086/317333]

Sollerman, J., P. Lundqvist, D. Lindler, et al. R. A. Chevalier, C. Fransson, T. R. Gull, C. S. Pun, and G. Sonneborn. 2000. Observations of the Crab Nebula and Its Pulsar in the Far-Ultraviolet and in the Optical The Astrophysical Journal 537 861 [10.1086/309062]

Maran, S. P., G. Sonneborn, C. S. Pun, et al. P. Lundqvist, R. C. Iping, and T. R. Gull. 2000. Physical Conditions in Circumstellar Gas Surrounding SN 1987A 12 Years after Outburst The Astrophysical Journal 545 390 [10.1086/317809]

Non-Refereed

Postman, M., V. Argabright, B. Arnold, et al. D. Aronstein, P. Atcheson, M. Blouke, T. Brown, D. Calzetti, W. Cash, M. Clampin, D. Content, D. Dailey, R. Danner, R. Doxsey, D. Ebbets, P. Eisenhardt, L. Feinberg, A. Fruchter, M. Giavalisco, T. Glassman, Q. Gong, J. Green, J. Grunsfeld, T. Gull, G. Hickey, R. Hopkins, J. Hraba, T. Hyde, I. Jordan, J. Kasdin, S. Kendrick, S. Kilston, A. Koekemoer, B. Korechoff, J. Krist, J. Mather, C. Lillie, A. Lo, R. Lyon, P. McCullough, G. Mosier, M. Mountain, B. Oegerle, B. Pasquale, L. Purves, C. Penera, R. Polidan, D. Redding, K. Sahu, B. Saif, K. Sembach, M. Shull, S. Smith, G. Sonneborn, D. Spergel, P. Stahl, K. Stapelfeldt, H. Thronson, G. Thronton, J. Townsend, W. Traub, S. Unwin, J. Valenti, R. Vanderbei, M. Werner, R. Wesenberg, J. Wiseman, and B. Woodgate. 2009. Advanced Technology Large-Aperture Space Telescope (ATLAST): A Technology Roadmap for the Next Decade eprint arXiv:09040941 0904 941

Grady, C. A., B. E. Woodgate, C. W. Bowers, et al. T. R. Gull, M. L. Sitko, and Et al.. 2005. Coronagraphic Imaging of Pre-Main-Sequence Stars with the Hubble Space Telescope Space Telescope Imaging Spectrograph I The Herbig Ae Stars The Astrophysical Journal 630 958 [10.1086/43073]