Computer Science
Scientific paper
Jun 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20707a&link_type=abstract
Spitzer Proposal ID #20707
Computer Science
Scientific paper
One of the main discoveries of the IRAS mission was that main-sequence stars can be accompanied by circumstellar dust disks (Vega phenomenon). In this proposal we investigate a sample of 62 Vega candidate stars, whose infrared excess above the photosphere - indication for the presence of a disk - was in most cases already measured by ISO or IRAS. All stars are in the spectral range of F0-F9, resulting in a rather homogeneous sample in terms of stellar mass and luminosity. On the basis of IRS and MIPS observations, we study (i) the temporal evolution of debris disks, focusing on the evolution of the geometrical structure of the disk and of grain processing of the disk material; (ii) individual systems with very high fractional luminosity; (iii) old stars with warm debris disks; and (iv) debris disks in young moving groups. Our results will be used to verify model predictions for F stars, and they can also be compared with the outcome of similar programs dedicated to A- and G-type stars.
Ábrahám Peter
Apai Daniel
Grady Carol
Henning Thomas
Kiss Csaba
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