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

Published online by Cambridge University Press:  21 October 2010

Antonio S. Hales
Affiliation:
Joint ALMA Observatory, Av. El Golf 40, Piso 18, Santiago, Chile, email: ahales@alma.cl
Michael J. Barlow
Affiliation:
Joint ALMA Observatory, Av. El Golf 40, Piso 18, Santiago, Chile, email: ahales@alma.cl
Janet E. Drew
Affiliation:
Joint ALMA Observatory, Av. El Golf 40, Piso 18, Santiago, Chile, email: ahales@alma.cl
Yvonne C. Unruh
Affiliation:
Joint ALMA Observatory, Av. El Golf 40, Piso 18, Santiago, Chile, email: ahales@alma.cl
Robert Greimel
Affiliation:
Joint ALMA Observatory, Av. El Golf 40, Piso 18, Santiago, Chile, email: ahales@alma.cl
Michael J. Irwin
Affiliation:
Joint ALMA Observatory, Av. El Golf 40, Piso 18, Santiago, Chile, email: ahales@alma.cl
Eduardo González-Solares
Affiliation:
Joint ALMA Observatory, Av. El Golf 40, Piso 18, Santiago, Chile, email: ahales@alma.cl
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Abstract

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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.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2010

References

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