HST/GHRS Observations of Molecular H_2 Lyman Band Emission in Pre-Main Sequence Stars

Details HST/GHRS Observations of Molecular H_2 Lyman Band Emission in Pre-Main Sequence Stars HST/GHRS Observations of Molecular H_2 Lyman Band Emission in Pre-Main Sequence Stars

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...186.0906w&link_type=abstract

American Astronomical Society, 186th AAS Meeting, #09.06; Bulletin of the American Astronomical Society, Vol. 27, p.825

Astronomy and Astrophysics

Astronomy

Scientific paper

We will present HST/GHRS spectra of 9 low mass PMS stars. All 7 classical T Tauri stars show evidence for H_2 Lyman band emission lines. Emission in the Lyman band arises from either shock-excited gas or in gas at temperatures of 2000-4000K. In the latter case, the emission can be used to probe the innermost portion of the circumstellar gaseous disks (within about 10 stellar radii). Comparison of large and small aperture spectra show that all the H_2 emission from T Tauri arises within 15 AU of the star. Two naked T Tauri stars, with ages of ~ 2 Myr, do not show evidence of H_2 emission. This has implications for the clearing times of the gaseous components of the circumstellar disks of PMS stars.

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