Astronomy and Astrophysics – Astronomy
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.7505c&link_type=abstract
American Astronomical Society Meeting 210, #75.05; Bulletin of the American Astronomical Society, Vol. 39, p.182
Astronomy and Astrophysics
Astronomy
Scientific paper
Since the discovery of Vega's (A0 V) large thermal infrared excess over the expected photospheric flux, dust disks have been found around a large fraction of main-sequence A-type stars. We have completed optical, infrared, ultraviolet, and far-ultraviolet spectroscopic surveys of nearby main-sequence A-type stars. With intensive follow-up ground-based observations, we have identified five of these stars with variable circumstellar gas similar to that seen in spectra of Beta Pictoris. All five stars have also been observed with Spitzer/MIPS. This carefully-selected sample allows us study the evolution of both gas and dust in the circumstellar disks of A-type stars. We are using these multiwavelength observations to answer the following questions: Are A-type stars with circumstellar gas and those with dust disks in the same evolutionary stage? Do dust disks develop only after most of the first generation gas has disappeared? Is the observed circumstellar gas second generation, formed from destruction of falling comets or planetesimals through collisions and evaporation?
Cheng Kwang-Ping
Neff James
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