IPHAS A-type Stars with Mid-IR Excesses in Spitzer Surveys

Details IPHAS A-type Stars with Mid-IR Excesses in Spitzer Surveys IPHAS A-type Stars with Mid-IR Excesses in Spitzer Surveys

Nov 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010hia....15..815h&link_type=abstract

Highlights of Astronomy, Volume 15, p. 815-815

Astronomy and Astrophysics

Astronomy

Stars: Circumstellar Matter, Planetary Systems: Proto-Planetary Disks

Scientific paper

The Isaac Newton Photometric H-Alpha Survey (IPHAS) provides (r′-Hα)-(r′-i′) colors, which can be used to select AV0-5 Main Sequence star candidates (age~20-200 Myr). By combining a sample of 23050 IPHAS-selected A-type stars with 2MASS, GLIMPSE and MIPSGAL photometry we searched for mid-infrared excesses attributable to dusty circumstellar disks. Positional cross-correlation yielded a sample of 2692 A-type stars, of which 0.6% were found to have 8-μm excesses above the expected photospheric values. The low fraction of main sequence stars with mid-IR excesses found in this work indicates that dust disks in the terrestrial planet zone of Main Sequence intermediate mass stars are rare. Dissipation mechanisms such as photo-evaporation, grain growth, collisional grinding or planet formation could possibly explain the depletion of dust detected in the inner regions of these disks.

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