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

  • Antonio S. Hales (a1), Michael J. Barlow (a1), Janet E. Drew (a1), Yvonne C. Unruh (a1), Robert Greimel (a1), Michael J. Irwin (a1) and Eduardo González-Solares (a1)...

Abstract

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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References

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Drew, J. E. et al. 2005, MNRAS, 362, 753
Hales, A. S. et al. , 2009, ApJ, 695, 75
Uzpen, B., Kobulnicky, H. A., Semler, D. R., Bensby, T., & Thom, C. 2008, ApJ, 685, 1157
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IPHAS A-type Stars with Mid-IR Excesses in Spitzer Surveys

  • Antonio S. Hales (a1), Michael J. Barlow (a1), Janet E. Drew (a1), Yvonne C. Unruh (a1), Robert Greimel (a1), Michael J. Irwin (a1) and Eduardo González-Solares (a1)...

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