Fluorescent H2 in HST/STIS FUV spectra of TTSs

Details Fluorescent H2 in HST/STIS FUV spectra of TTSs Fluorescent H2 in HST/STIS FUV spectra of TTSs

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...199.6006h&link_type=abstract

American Astronomical Society, 199th AAS Meeting, #60.06; Bulletin of the American Astronomical Society, Vol. 33, p.1394

Astronomy and Astrophysics

Astronomy

Scientific paper

We survey Lyman-band H2 fluorescence in the FUV spectrum of the CTTSs T Tau, DF Tau, RU Lupi, DG Tau and , and the wTTS V836 Tau, as observed with HST/STIS using the E140M grating and a 0.2″ x 0.06″ aperture. The H2 is electronically excited by the broad red wing of Lyα from lower levels of 1 to 2 eV, consistent with an H2 gas temperature of 2000-3000 K. This process occurs in CTTSs because the red wing of Lyα is significantly enhanced by accretion onto the star. We analyze the velocity shifts, narrow widths, and fluxes of these lines, and discuss the origin of these lines in the circumstellar environment. We also observed extended H2 from T Tau using a 52''x0.2″ slit in the G140L mode of HST/STIS. We compare the extended emission to the on-source emission, as observed with the small aperture using E140M, and discuss the physical implications for differences in these spectra.

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