Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21733913f&link_type=abstract
American Astronomical Society, AAS Meeting #217, #339.13; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
We present new far-UV spectroscopic observations of a sample of classical T Tauri stars obtained with the HST-Cosmic Origins Spectrograph. The combination of very low background and moderate spectral resolution allow us to unambiguously measure the processes that contribute to the far-UV continuum emission in these systems: hot chromospheric accretion, electron-excited H2, and CO A-X band emission. Previous observations have lacked the sensitivity to detect this faint emission or the spectral resolution to study the composition of this ``continuum'' in detail. We show that the accretion spectrum can be fit in a continuous manner from the far-UV to the optical in some systems. The far-UV spectrum of CO has been identified and modeled for the first time in a protostellar/protoplanetary disk. The electron impact spectrum of H2 has been modeled, and results indicate that the red far-UV color ratio and attenuation of discrete Werner band features is consistent with absorption by hydrocarbons in the inner disk.
Brown Adrian
France Kevin
Harper Graham M.
Herczeg Gregory J.
Linsky Jeffrey L.
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