Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...195.7804b&link_type=abstract
American Astronomical Society, 195th AAS Meeting, #78.04; Bulletin of the American Astronomical Society, Vol. 31, p.1487
Astronomy and Astrophysics
Astronomy
Scientific paper
We have detected emission from quiescent, molecular hydrogen gas in the disk around the classical T Tauri star TW Hya in the 1-0 S(1) line at 2.12183 μ m, through high resolution spectroscopy using CSHELL on NASA's Infrared Telescope Facility. The H2 line emission most likely is the result of excitation in the innermost region of the disk by stellar X-rays. This result demonstrates that X-ray ionization is a viable mechanism for excitation of H2 in the gaseous disks of classical T Tauri stars. In addition, from these high resolution spectra we have measured the radial velocities of three T Tauri stars in the TW Hya Association. We find that the radial velocity of CD-33o7795 is very similar to the known radial velocites of both TW Hya and HD 98800. This result lends support to the hypothesis that these stars share a common origin in a now-dispersed molecular cloud. This work is supported by NASA grants NAG5-8295, NAG5-4428, and GO07861.01-96A to Vanderbilt University.
Bary Jeffery S.
Kastner Joel H.
Weintraub David A.
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