Dr. Guillermo Gonzalez

RESEARCH SCIENTIST II, Center for Applied Optics

Biography

Dr. Guillermo Gonzalez received his B.S. degrees in Astronomy and Physics from the University of Arizona (1987), then his M.S. and Ph.D. degrees in Astronomy from the University of Washington (1990 and 1993, respectively) conducting photometric and spectroscopic analyses of W Virginis and post-AGB stars. Then, he was at the University of Texas at Austin as a post-doc for three years. While there, he frequently observed at the McDonald Observatory in west Texas, where he obtained high-resolution spectra of stars. He discovered that stars are more likely to host giant planets if they are metal-rich. He did a second post-doc at the University of Washington, where he continued to work on spectroscopy of evolved stars and stars hosting Doppler-detected planets and developed the Galactic Habitable Zone concept. He then joined the Astronomy and Physics Department at Iowa State University. There he continued working on astrobiology topics and evolved stars, taught astronomy courses, and served as the director of the Fick Observatory. He went on to do similar work at Grove City College for five years, followed by Ball State University for six years, where he taught astronomy and physics courses. He joined UAH in 2019.

    Dr. Gonzalez’s interests include astrobiology, quantitative stellar spectroscopy, stellar photometric variability, and ancient astronomical observations.

    He has published two books over 80 peer-reviewed papers.


Education

  • Ph.D. 1993 The University of Washington, Seattle, WA., Astronomy, Advisor: George Wallerstein, Dissertation: “A Study of the UV-Bright Stars in omega CEN and the Type II Cepheid ST PUP”
  • M.S. 1990 The University of Washington, Seattle, WA. Astronomy

Previous Positions

  • June 2019 to Present: Research Scientist II, CAO-UAH
  • August 2013 to May 2019: Assistant Professor, Ball State University-Astronomy and Physics
  • June 2008 to July 2013: Associate Professor, Grove City College-Physics
  • August 2001 to May 2008: Assistant Professor, Iowa State University-Astronomy and Physics
  • October 1996 to July 2001: Post-doc, University of Washington-Astronomy
  • October 1993 to October 1996: Post-doc, University of Washington-Astronomy

Publications

  • “New constraints on T Prior to the Second Century AD,” Gonzalez, G., Monthly Notices of the Royal Astronomical Society, 482(2), pp. 1452-1455, (2019)
  • “Constraining T from Babylonian Lunar Appulse and Occultation Observations,” Gonzalez, G., Monthly Notices of the Royal Astronomical Society, 470(2), pp. 1436-1441, (2017)
  • “A Revised Gyro-Age for M 67 from Kepler/K2-Campaign-5 Light Curves,” Gonzalez, G., Monthly Notices of the Royal Astronomical Society 463(4), pp. 3513-3519, (2016)
  • “Variability among stars in the M 67 field from Kepler/K2-Campaign-5 light curves,” Gonzalez, G., Monthly Notices of the Royal Astronomical Society 459(1), pp. 1060-1068, (2016)
  • “Parent stars of extrasolar planets - XV. Host star rotation revisited with Kepler data,” Gonzalez, G., Monthly Notices of the Royal Astronomical Society 450(3), pp. 3227-3232, (2015)
  • “Parent stars of extrasolar planets - XIV. Strong evidence of Li abundance deficit,” Gonzalez, G., Monthly Notices of the Royal Astronomical Society 446(1), pp. 1020-1025, (2015)
  • “Solar system chemical abundances corrected for systematics,” Gonzalez, G., Monthly Notices of the Royal Astronomical Society 443(1), pp. L99-L103, (2014)
  • “The metallicity dependence of giant planet incidence,” Gonzalez, G., Monthly Notices of the Royal
  • “Parent stars of extrasolar planets - XIII. Additional evidence for Li abundance anomalies,” Gonzalez, G., Monthly Notices of the Royal Astronomical Society 441(2), pp. 1201-1208, (2014)
  • “Setting the stage for habitable planets,” Gonzalez, G., Life 4(1), pp. 35-65, (2014) (Special issue, “Planet formation and the rise of life”)
  • “Parent stars of extrasolar planets - XII. Additional evidence for trends with v sin i, condensation temperature and chromospheric activity,” Gonzalez, G., Monthly Notices of the Royal Astronomical Society 416(1), pp. L80-L83, (2011)
  • “The two metallicity groups of the globular cluster M 22: a chemical perspective,” Marino, A.F., Sneden, C., Kraft, R.P., Wallerstein, G., Norris, J.E., da Costa, G., Milone, A.P., Ivans, I.I., Gonzalez, G., Fulbright, J.P., Hilker, M., Piotto, G., Zoccali, M., Stetson, P.B., Astronomy & Astrophysics 532, id.A8, 24 pp., (2011)
  • “Parent stars of extrasolar planets - XI. Trends with condensation temperature revisited,” Gonzalez, G., Carlson, M.K., Tobin, R.W., Monthly Notices of the Royal Astronomical Society 407(1), pp. 314-320, (2010)
  • Parent stars of extrasolar planets - X. Lithium abundances and v sini revisited,” Gonzalez, G., Carlson, M.K., Tobin, R.W., Monthly Notices of the Royal Astronomical Society 403(3), pp. 1368-1380, (2010)
  • “Effects of the Planar Galactic Tides and Stellar Mass on Comet Cloud Dynamics,” Masi, M., Secco, L., Gonzalez, G., The Open Astronomy Journal 2, pp. 74-89, (2009)
  • “Stars with planets and the thick disk,” Gonzalez, G., Monthly Notices of the Royal Astronomical Society 399(1), pp. L103-L107, (2009)
  • “Mutual eclipses in the Solar System,” Gonzalez, G., Astronomy & Geophysics 50(2), pp. 2.17-2.19, (2009)
  • “Parent stars of extrasolar planets - IX. Lithium abundances,” Gonzalez, G., Monthly Notices of the Royal Astronomical Society 386(2), pp. 928-934, (2008)
  • “Correlations between lithium and technetium absorption lines in the spectra of Galactic S stars,” Vanture, A.D., Smith, V.V., Lutz, J., Wallerstein, G., Lambert, D.L., G Gonzalez, G., Publications of the Astronomical Society of the Pacific 119, pp. 147-155, (2007)
  • 2007. “Parent stars of extrasolar planets - VIII. Chemical abundances for 18 elements in 31 stars,” Gonzalez, G., Laws, C., Monthly Notices of the Royal Astronomical Society 378, pp. 1141-1152, (2007)
  • “Condensation temperature trends among stars with planets,” Gonzalez, G., Monthly Notices of the Royal Astronomical Society 367, pp. L37-L41, (2006)
  • “The Sun’s interior metallicity constrained by neutrinos,” Gonzalez, G., Monthly Notices of the Royal Astronomical Society 370, pp. L90-L93, (2006)
  • “Indium abundance trends among sun-like stars,” Gonzalez, G., Monthly Notices of the Royal Astronomical Society 371, pp. 781-785, (2006)
  • “The chemical compositions of stars with planets: A review,” Gonzalez, G., Publications of the Astronomical Society of the Pacific 118, pp. 1494-1505, (2006)
  • “Habitable zones in the universe,” Gonzalez, G., Origins of Life and Evolution of the Biosphere 35, pp. 555-606, (2005)
  • “Abundance analyses of field RV Tauri stars. VI. An extended sample,” Giridhar, S., Lambert, D.L., Reddy, B.E., Gonzalez, G., D Yong, D., The Astrophysical Journal 627, pp. 432-445, (2005)
  • “‘Sculptor-ing’ the Galaxy? The chemical compositions of red giants in the Sculptor dwarf spheroidal galaxy,” Geisler, D., Smith, V.V., Wallerstein, G., Gonzalez, G., Charbonnel, C., The Astronomical Journal 129, pp. 1428-1442, (2005)
  • “Elemental abundances of three red giants in Terzan 7, a globular cluster associated with the Sagittarius galaxy,” Tautvaišienė, G., Wallerstein, G., D Geisler, D., Gonzalez, G., C Charbonnel, C., The Astronomical Journal 127, pp. 373-379, (2004)
  • “On the question of a metallicity spread in globular cluster M22 (NGC 6656),” Ivans, I.I., Sneden, C., Wallerstein, G., Kraft, R.P., Norris, J.E., Fulbright, J.P., Gonzalez, G., Memorie della Societa Astronomica Italiana 75, pp. 286-289, (2004).
  • “Reseeding of early Earth by impacts of returning ejecta during the late heavy bombardment,” Wells, L.E., Armstrong, J.C., Gonzalez, G., Icarus 162, pp. 38-46, (2003)
  • “Parent stars of extrasolar planets. VII. New abundance analyses of 30 systems,” Laws, C., Gonzalez, G., Walker, K.M., Tyagi, S., Dodsworth, J., Snider, K., Suntzeff, N.B., The Astronomical Journal 125, pp. 2664-2677, (2003)
  • “A reevaluation of the super-lithium-rich star in NGC 6633,” Laws, C., Gonzalez, G., The Astrophysical Journal 595, pp. 1148-1153, (2003)
  • “Colloquium: Stars, planets, and metals,” Gonzalez, G., Reviews of Modern Physics 75, pp. 101-120, (2003)
  • “A reinvestigation of the possible metallicity spread in NGC 3201,” Covey, K.R., Wallerstein, G., Gonzalez, G., Vanture, A.D., Suntzeff, N.B., Publications of the Astronomical Society of the Pacific 115, pp. 819-824, (2003)
  • “Optical and infrared photometry of the unusual Type Ia supernova 2000cx,” Candia, P., Krisciunas, K., Suntzeff, N.B., González, D., Espinoza, J., Leiton, R., Rest, A., Smith, R.C., Cuadra, J., Tavenner, T., Logan, C., Snider, K., Thomas, M., West, A.A., Gonzalez, G., Gonzalez, S., Phillips, M.M., Hastings, N.C., McMillan, R., Publications of the Astronomical Society of the Pacific 115, pp. 277-294, (2003)
  • “A search for 6-Li in stars with planets,” Reddy, B.E., Lambert, D.L., Laws, C., Gonzalez, G., Covey, K., Monthly Notices of the Royal Astronomical Society 335, pp. 1005-1016, (2002)
  • “Spectroscopic analysis of two carbon-rich post-asymptotic giant branch stars,” Reddy, B.E., Lambert, D.L., Gonzalez, G., Yong, D., The Astrophysical Journal 564, pp. 482-494, (2002)
  • “Stellar atmospheres of nearby young solar analogs,” Gaidos, E.J., Gonzalez, G., New Astronomy 7, pp. 211-226, (2002)
  • “Rummaging through Earth's attic for remains of ancient life,” Armstrong, J.C., Wells, L.E., Gonzalez, G., Icarus 160, pp. 183-196, (2002)
  • “The spectrum of VY Canis Majoris in 2000 February,” Wallerstein, G., Gonzalez, G., Publications of the Astronomical Society of the Pacific 113, pp. 954-956, (2001)
  • “A differential spectroscopic analysis of 16 Cygni A and B,” Laws, C., Gonzalez, G., The Astrophysical Journal 553, pp. 405-409, (2001)
  • “Parent stars of extrasolar planets. VI. Abundance analyses of 20 new systems,” Gonzalez, G., Laws, C., Tyagi, S., Reddy, B.E., The Astronomical Journal 121, pp. 432-452, (2001)
  • “The Galactic habitable zone: Galactic chemical evolution,” Gonzalez, G., Brownlee, D., Ward, P.D., Icarus 152, pp. 185-200, (2001)
  • “Chemical compositions of four metal-poor giant stars,” Giridhar, S., Lambert, D.L., Gonzalez, G., Pandey, G., Publications of the Astronomical Society of the Pacific 113, pp. 519-528, (2001)
  • “The nature of super-metal-rich stars. Detailed abundance analysis of 8 super-metal-rich star candidates,” Feltzing, S., Gonzalez, G., Astronomy and Astrophysics 367, pp. 253-265, (2001)
  • “The carbon cepheid RT Trianguli Australis: Additional evidence of triple-α and CNO cycling,” Wallerstein, G., Matt, S., Gonzalez, G., Monthly Notices of the Royal Astronomical Society 311, pp. 414-422, (2000)
  • “Elemental abundances in evolved supergiants. II. The young clusters h and χ Persei,” Gonzalez, G., Wallerstein, G., The Astronomical Journal 119, pp. 1839-1847, (2000)
  • “Elemental abundances in the inner Galaxy open cluster M11,” Gonzalez, G., Wallerstein, G., Publications of the Astronomical Society of the Pacific 112, pp. 1081-1088, (2000)
  • “Parent stars of extrasolar planets. V. HD 75289,” Gonzalez, G., Laws, C., The Astronomical Journal 119, pp. 390-396, (2000)
  • “Abundance analyses of field RV Tauri stars. V. DS Aquarii, UY Arae, TW Camelopardalis, BT Librae, U Monocerotis, TT Ophiuchi, R Scuti, and RV Tauri,” Giridhar, S., Lambert, D.L., Gonzalez, G., The Astrophysical Journal 531, pp. 521-536, (2000)
  • “The chemical compositions of the SRd variable stars. III. KK Aquilae, AG Aurigae, Z Aurigae, W Leo Minoris, and WW Tauri,” Giridhar, S., Lambert, D.L., Gonzalez, G., Publications of the Astronomical Society of the Pacific 112, pp. 1559-1566, (2000)
  • “The CaII-M_v correlation (Wilson-Bappu effect) calibrated by Hipparcos parallaxes,” Wallerstein, G., Machado-Pelaez, L., Gonzalez, G., Publications of the Astronomical Society of the Pacific 111, pp. 335-341, (1999)
  • “Stellar evolution in fast forward,” Vanture, A.D., Gonzalez, G., Astronomy and Geophysics 40, pp. 1.14-1.16, (1999)
  • “The 1995-96 decline of R Coronae Borealis: High-resolution optical spectroscopy,” Kameswara Rao, N., Lambert, D.L., Adams, M.T., Doss, D.R., Gonzalez, G., Hatzes, A.P., James, C.R., Johns-Krull, C.M., Luck, R.E., Pandey, G., Reinsch, K., Tomkin, J., Woolf, V.M., Monthly Notices of the Royal Astronomical Society 310, pp. 717-744, (1999)
  • “Parent stars of extrasolar planets. IV. 14 Herculis, HD 187123, and HD 210277,” Gonzalez, G., Wallerstein, G., Saar, S.H., The Astrophysical Journal Letters 511, pp. L111-L114, (1999)
  • “Elemental abundances in evolved supergiants. I. NGC 330, a young SMC cluster,” Gonzalez, G., Wallerstein, G., The Astronomical Journal 117, pp. 2286-2295, (1999)
  • “Wonderful eclipses,” Gonzalez, G., Astronomy and Geophysics 40, pp. 3.18-3.20, (1999)
  • “Are stars with planets anomalous?,” Gonzalez, G., Monthly Notices of the Royal Astronomical Society 308, pp. 447-458, (1999)
  • “Is the Sun anomalous?,” Gonzalez, G., Astronomy and Geophysics 40, 5.25-5.29, (1999)
  • “The chemical compositions of the SRd variable stars. II. WY Andromedae, VW Eridani, and UW Librae,” Giridhar, S., D L Lambert, D.L., Gonzalez, G., Publications of the Astronomical Society of the Pacific 111, pp. 1269-1274, (1999)
  • “Elemental abundances in five stars in M54, a globular cluster associated with the Sagittarius galaxy,” Brown, J.A., Wallerstein, G., Gonzalez, G., The Astronomical Journal 118, pp. 1245-1251, (1999)
  • “Elemental abundances in giants in NGC 3201, a globular cluster with a retrograde orbit,” Gonzalez, G., Wallerstein, G. The Astronomical Journal 116, pp. 765-781, (1998)
  • “Parent stars of extrasolar planets III: Cancri revisited,” Gonzalez, G., A D Vanture, A.D., Astronomy and Astrophysics 339, pp. L29-L32, (1998)
  • “FG Sagittae: A newborn R Coronae Borealis star?,” Gonzalez, G., Lambert, D.L., Wallerstein, G., Rao, N.K., Smith, V.V., McCarthy, J.K., The Astrophysical Journal Supplement Series 114, pp. 133-149, (1998)
  • “Spectroscopic analyses of the parent stars of extrasolar planetary system candidates,” Gonzalez, G., Astronomy and Astrophysics 334, pp. 221-238, (1998)
  • “The chemical compositions of the SRd variable stars. I. XY Aquarii, RX Cephei, AB Leonis, and SV Ursae Majoris,” Giridhar, S., Lambert, D.L., Gonzalez, G., Publications of the Astronomical Society of the Pacific 110, pp. 671-675, (1998)
  • “Abundance analyses of field RV Tauri stars. IV. AD Aquilae, DS Aquarii, V360 Cygni, AC Herculis, and V453 Ophiuchi,” Giridhar, S., Lambert, D.L., Gonzalez, G., The Astrophysical Journal 509, pp. 366-378, (1998)
  • “Lithium and r-process abundances in the population II cepheid M5 v42,” Carney, B.W., Fry, A.M., Gonzalez, G., The Astronomical Journal 116, pp. 2984-2992, (1998)
  • “Spectral variability of the binary HR 4049,” Bakker, E.J., Lambert, D.L., Van Winckel, H., McCarthy, J.K., Waelkens, C., Gonzalez, G., Astronomy and Astrophysics 336, pp. 263-275, (1998)
  • “The chemical composition of IRAS 05341+0852: A post-AGB F supergiant with 21 micron emission,” Reddy, B.E., Parthasarathy, M., Gonzalez, G., Bakker, E.J., Astronomy and Astrophysics 328, pp. 331-338, (1997)
  • “On the hydrogen deficient nature of Z Umi,” Goswami, A., Rao, N.K., Lambert, D.L., Gonzalez, G., Publications of the Astronomical Society of the Pacific 109, pp. 796-798, (1997)
  • “Abundance analyses of the field RV Tauri variables: EP Lyrae, DY Orionis, AR Puppis, and R Sagittae,” Gonzalez, G., Lambert, D.L., Giridhar, S., The Astrophysical Journal 479, pp. 427-440, (1997)
  • “Abundance analyses of field RV Tauri variables. III. DY Aquilae, SS Geminorum, CT Orionis, and CE Virginis,” Gonzalez, G., Lambert, D.L., Giridhar, S., The Astrophysical Journal 481, pp. 452-466, (1997)
  • “Abundance analyses of Type II cepheids in globular clusters,” Gonzalez, G., Lambert, D.L., The Astronomical Journal 114, pp. 341-351, (1997)
  • “Ground-level humidity, pressure and temperature measurements during the October 24, 1995 total solar eclipse,” Gonzalez, G., Kodaikanal Observatory Bulletins 13, pp. 151-154, (1997)
  • “The stellar metallicity-giant planet connection,” Gonzalez, G., Monthly Notices of the Royal Astronomical Society 285, pp. 403-412, (1997)
  • “The carbon cepheid V553 cen: Evidence of triple-alpha and CNO cycling,” Wallerstein, G., Gonzalez, G., Monthly Notices of the Royal Astronomical Society 282, pp. 1236-1246, (1996)
  • “ST Pup: A binary Type II cepheid with a peculiar chemical composition,” Gonzalez, G., Wallerstein, G., Monthly Notices of the Royal Astronomical Society 280, pp. 515-536, (1996)
  • “A fine abundance analysis of four stars in the Per cluster- a cautionary tale,” Gonzalez, G., Lambert, D.L., The Astronomical Journal 111, pp. 424-438, (1996)
  • “The lithium content and other properties of F2-G5 giants in the Hertzsprung gap,” Wallerstein, G., Bohm-Vitense, E., Vanture, A.D., Gonzalez, G., The Astronomical Journal 107, pp. 2211-2221, (1994)
  • “Study of the UV-bright stars in Cen. II: Abundances and evidence for evolutionary mixing,” Gonzalez, G., Wallerstein, G., The Astronomical Journal 108, pp. 1325-1349, (1994)
  • “A photometric study of the UV-bright stars in Cen,” Gonzalez, G., The Astronomical Journal 108, pp. 1312-1324, (1994)
  • “An abundance analysis of ROA 24, a likely post-AGB star in Omega Centauri,” Gonzalez, G., Wallerstein, G., Monthly Notices of the Royal Astronomical Society 254, pp. 343-354, (1992)
  • “Washington photometry of nearby F, G, and K dwarfs,” Gonzalez, G., Piche, F., The Astronomical Journal 103, pp. 2048-2062, (1992).
  • “Stellar wind paleontology. II - Faint halos and historical mass ejection in planetary nebulae,” Balick, B., Gonzalez, G., Frank, A., Jacoby, G., The Astrophysical Journal 392, pp. 582-596, (1992)
  • “Using geomagnetic indices to forecast the next sunspot maximum,” Gonzalez, G., Schatten, K.H., Solar Physics, 114, pp. 189-192, (1987)