FUSE Observations of Molecular Hydrogen in PMS Stars

Details FUSE Observations of Molecular Hydrogen in PMS Stars FUSE Observations of Molecular Hydrogen in PMS Stars

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003csss...12..717h&link_type=abstract

The Future of Cool-Star Astrophysics: 12th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun (2001 July 30 - August

Astronomy and Astrophysics

Astrophysics

2

Cttss, Herbig Ae/Be, Star Formation, Circumstellar Disks, H2, Fuse

Scientific paper

Pre-main sequence stars exhibit rich molecular hydrogen emission and absorption spectra in the FUV. We survey four PMS stars that have been observed with FUSE: the Classical T Tauri Stars TW Hya and V4046 Sgr, and the Herbig Ae/Be stars AB Aur and DX Cha. The spectrum of TW Hya and V4046 Sgr show H2 fluorescence in Lyman (B-X) and Werner (C-X) bands caused by photoexcitation by Lyα, H2 absorption occurs against line and continuum emission in the spectrum of AB Aur and DX Cha. We measure column densities of log(NH_2)=20.2 ± 0.2 cm-2 towards AB Aur and log(NH_2)=19.4± 0.2 cm-2 towards DX Cha. The rotational excitation temperature of the H2 gas around DX Cha varies from 300--500 K for different rotational levels, compared with 65--450 K the gas around AB Aur. We discuss the circumstellar origin of H2 emission and absorption.

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