Bright Stars with Spitzer 24 μm Excesses in Boötes and FLS

Details Bright Stars with Spitzer 24 μm Excesses in Boötes and FLS Bright Stars with Spitzer 24 μm Excesses in Boötes and FLS

Nov 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010vaoa.conf...84h&link_type=abstract

"Evolution of Cosmic Objects through their Physical Activity, Proceedings of the Conference dedicated to Viktor Ambartsumian's 1

Physics

Scientific paper

Optically bright stellar sources (V<15) with fnu (24 μm) > 1 mJy are identified in a survey with the Multiband Imaging Photometer on Spitzer (MIPS) within 8.2 deg2 of the NOAO Deep Wide-Field Survey region in Boötes (NDWFS) and within 5.5 deg2 for the Spitzer Extra-Galactic First Look Survey (FLS). 128 stars are identified in Bootes and 140 in the FLS, and their photometry is given. Stars are classified using spectra from the Digitized First Byurakan Survey (DFBS) and (K-[24]) colors are determined using K magnitudes from the 2MASS survey to search for 24 μm excesses. In the combined sample of 268 stars, 26 have excesses with (K-[24]) > 0.2. The star with the greatest (K-[24]) excess is a variable star; the remaining 25 stars have 0.2 < (K-[24]) < 0.7 and are candidates for having debris disks. Using limits on absolute magnitude derived from proper motions, it is estimated that at least 12 of the stars with excesses are main sequence stars, and estimates derived from the distribution of apparent magnitudes indicate that 22 are main sequence stars. These estimates lead to the conclusion that between 5% and 10% of the main sequence field stars in these samples have hot debris disks. For comparison using the same (K-[24]) > 0.2 criterion for defining an excess, 5 of 69 bright, main sequence FGK field stars in a previous Spitzer survey show excesses.

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