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Newly identified main-sequence A stars with circumstellar dust
Cheng, K.-P.; Bruhweiler, F. C.; Kondo, Y.; Grady, C. A.
AA(NASA, Goddard Space Flight Center, Greenbelt, MD), AB(Catholic University of America, Washington), AC(NASA, Goddard Space Flight Center, Greenbelt, MD), AD(Catholic University of America, Washington)
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 396, no. 2, Sept. 10, 1992, p. L83-L86. (ApJL Homepage)
Publication Date:
NASA/STI Keywords:
A Stars, Infrared Sources (Astronomy), Main Sequence Stars, Stellar Envelopes, Astronomical Catalogs, Extrasolar Planets, Faint Objects, Infrared Astronomy Satellite, Infrared Cirrus (Astronomy), Planetary Evolution
Bibliographic Code:


The IRAS Faint Source Survey data base and the ADDSCAN/SCANPI software are used to search for systems with circumstellar dust in two samples: all of the 62 A stars in Woolley's catalog, which lie near the main sequence and are typically within 25 pc of the sun, and all A stars in the Bright Star Catalogue with mV in the range 4-5 and v sin i not less than 100 km/s. In the first sample, 11 nearby A stars having (12)-(25) and (25)-(60) colors consistent with circumstellar dust are found. The analysis of the second sample demonstrates that the use of the FSS data base increases the likelihood of identifying A stars with circumstellar dust fainter than mV = 4. Three more new dusty systems are found in this sample. Beta Pictoris (A5 IV-V) is the only star within 25 pc of the sun that displays IR colors indicative of both warm and cool dust. It is inferred from the absence of cool dust in the vast majority of the systems that the dust disks of these stars are much less extended than that seen around Beta Pictoris.

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