Position: Research Professor Office: Stadium 123B Phone: 303-492-4051 FAX: 303-492-4052 Email:thomas.ayres@colorado.edu
Teaching Interests:
Stellar atmospheres and radiative transfer
Introductory astronomy
Internal processes (in gases and plasmas)
Scale model solar system displays
APS 5730 (Stellar Exteriors) Fall 2001
Research Interests:
High-energy stellar astrophysics
Chromospheres, coronae, and winds
Infrared solar astronomy
Stellar atmospheres modeling
Solar-stellar connection
Ultraviolet spectroscopy
Spacecraft instrumentation
Image processing and visualization
Atomic and molecular processes
Recent Publications (2000- 2009):
Ayres, T.R., 2002, "Does the Sun have a full-time COmosphere?", Ap.J., 575, 1104-1115.
Ayres, T.R., Brown, A., Harper, G., Osten, R., Linsky, J., Wood, B., and Redfield, S. 2002, "Space Telescope Imaging Spectrograph Survey of Far-Ultraviolet Coronal Forbidden Lines in Late-Type Stars", Ap.J., in press.
Osten, R., Ayres, T., Brown, A., Linsky, J., and Krishnamurthi, A. 2002, "Chandra, EUVE, and VLA Observations of the Active Binary Sigma2 Coronae Borealis", Ap. J., in press.
Simon, T., Ayres, T., Redfield, S., and Linsky, J. 2002, "Limits on Chromospheres and Convection Among the Main-Sequence A Stars", Ap. J., 579, 800-809.
Ayres, T.R., Osten, R.A., and Brown, A. 2001, “3 Ms in the
Life of Beta Ceti: Sustained Flare Activity on a Clump Giant Detected by the
Extreme Ultraviolet Explorer”, Ap. J. Lett., 562, L83.
Clayton, G.C. and Ayres, T.R. 2001, “Long-Slit Observations
of Extended C II l1335 Emission Around V854 Centauri and RY Sagittarii”, Ap.
J., 560, 986.
Ayres, T.R., Brown, A. , Osten, R., Huenemoerder, D., Drake,
J. , Brickhouse, N., and Linsky, J. 2001, “Chandra, EUVE, HST and VLA Multiwavelength
Campaign on HR 1099: Instrumental Capabilities, Data Reduction, and Initial
Results”, Ap. J., 549, 554.
Ayres, T.R. 2000, "The SOHO-Stellar Connection", Solar
Physics, 193, 273.
Simon, T. and Ayres, T.R. 2000, “71
Tauri: Hyades Enigma Resolved”?, Ap. J., 539, 325.
Publications (1995-1999):
Ayres, T.R. 1999, "Digging Deeper in the Coronal Graveyard: Postscript",
Ap.J., 525, 1009.
Ayres, T.R., Osten, R.A., and Brown, A. 1999, "The Rise and Fall of µ
Velorum: A Remarkable Flare on a Yellow Giant Star Observed with the Extreme
Ultraviolet Explorer", Ap.J., 526, 445.
Ayres, T.R. 1999, "Sleuthing the Dynamo II. HST Goddard High Resolution
Spectrograph Observations of Solar-Type Dwarfs in Young Galactic Clusters",
Ap.J. (Part I), 525, 240.
Clayton, G., Ayres, T.R., Lawson, W., Drilling, J., Woitke, P., and Asplund,
M. 1999, "First Observations of an R Coronae Borealis Star with the Space
Telescope Imaging Spectrograph: RY Sagittarii Near Maximum Light", Ap.J.,
515, 351.
Simon, T. and Ayres, T.R. 1998, "High-Excitation Emission Lines in the Far-Ultraviolet
Spectrum of the Late A Star alpha Cephei", Ap.J.Lett., 500,
L37.
Brunner, A., Clayton, G., and Ayres, T.R. 1998, "A Search for an Emission-Line
Region in the Hydrogen-deficient Carbon Star HD 182040", PASP, 110,
1412.
Ayres, T., Simon, T., Stern, R., Drake, S., Wood, B., and Brown, A. 1998,
The Coronae of Moderate Mass Giants in the Hertzsprung Gap and the Clump,
Ap.J., 496, 428.
Wood, B., Linsky, J., and Ayres, T. 1997, Evaluating Possible Heating Mechanisms
Using the Transition Region Line Profiles of Late-Type Stars, Ap.J.,
478, 745.
Ayres, T. 1997, Evolution of the Solar Ionizing Flux, JGR Planets,
102, 1641.
Piskunov, N., Wood, B., Linsky, J., Dempsey, R., and Ayres, T. 1997, Local
Interstellar Medium Properties and Deuterium Abundances for the Lines of Sight
toward HR 1099, 31 Comae, beta Ceti, and beta Cassiopeiae, Ap.J., 474,
315.
Ayres, T.R. 1997, "Stellar Spectroscopy with HST," in Cool Star, Stellar
Systems, and the Sun," 9th Cambridge Workshop, 109, 215.
Ayres, T. 1997, "Thermal Bifurcation as a Driver of Stellar Surface Inhomogeneities,"
in Stellar Surface Structure, IAU Symp. 176, 371.
Wanders, I., Peterson, B., Alloin, D., Ayres, T. et al. 1997, "Steps Toward
Determination of the Size and Structure of the Broad-Line Region in Active
Galactic Nuclei. XI. Intensive Monitoring of the Ultraviolet Spectrum of NGC
7469," Ap.J., 113, 69.
Ayres, T.R., Brown, A., Harper, G., Pennett, P., Linsky, J., Carpenter,
K., and Robinson, R. 1997, "Digging Deeper in the Coronal Graveyard," Ap.J.,
491, 876.
Ayres, T.R. and Rabin, D. 1996, "Observations of Solar Carbon Monoxide with
an Imaging Infrared Spectrograph. I. Thermal Bifurcation Revisited", Ap.J.,
460, 1042.
Ayres, T.R., Simon, T., Stauffer, J., Stern, R., Pye, J., and Brown, A.
1996, "Sleuthing the Dynamo: HST Faint Object Spectrograph Observations of
Solar-Type Dwarfs in Young Galactic Clusters", Ap.J., 473, 279.
Ayres, T.R. and 23 co-authors, 1995, "The RIASS Coronathon: Joint X-ray
and Ultraviolet Observations of Normal F-K Stars", Ap.J.Suppl., 96,
223.
Ayres, T.R. 1995, "Hot Times in the Hertzsprung Gap" in Astrophysics
in the Extreme Ultraviolet", eds. S. Bowyer and R. Malina, Kluwer, p.
113.
Ayres, T.R. 1995, "Thermal Bifurcation Revisited" in Infrared Tools for
Solar Astrophysics: What's Next?", eds. J.R. Kuhn and M.J. Penn (Singapore:
World Scientific), p. 289.
