Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aspc..348..300c&link_type=abstract
Astrophysics in the Far Ultraviolet: Five Years of Discovery with FUSE ASP Conference Series, Vol. 348, Proceedings of the Confe
Astronomy and Astrophysics
Astrophysics
Scientific paper
Since the discovery of Vega's (A0 V) large thermal IR excess over the extrapolated stellar photospheric radiation, dust disks around a large fraction of main-sequence A-type stars have been found by IRAS and ISO. Subsequent visual and ultraviolet observations of two of these stars, Beta Pic (A5 V) and 51 Oph (A0 V), have revealed a dynamic circumstellar gas disk. Although the amount of gas around main sequence A-type stars is much less than around T Tauri stars, circumstellar gas plays a crucial role in planet system formation. Many circumstellar absorption lines in the far-ultraviolet wavelength range are excellent diagnostics of circumstellar gas properties. We have obtained and analyzed FUSE spectra of two main-sequence A-type stars (2 And and δ UMa) to study the origin of their circumstellar gas disks and the possible link between their circumstellar gas and dust.
Cheng Kwang-Peng
Neff James E.
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