Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...368..264a&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 368, Feb. 10, 1991, p. 264-271.
Astronomy and Astrophysics
Astronomy
56
Early Stars, Infrared Sources (Astronomy), Main Sequence Stars, Stellar Envelopes, A Stars, F Stars, G Stars, Infrared Astronomy Satellite, K Stars, Statistical Analysis, Stellar Spectrophotometry
Scientific paper
The identification of Vega-like main-sequence stars with 10-micron excess would permit important measurements of the spatial extent of the radiating material with ground-based telescopes. In fact, 55 of the 548 nearby A, F, G, and K dwarfs with IRAS catalog magnitudes at 12 microns appear to have excess 12-micron flux. However, for only two of these stars, Beta Pic and Zeta Lep, was it possible, using small-aperture photometry at 2.2 and 10 microns, to verify that the 12-micron excess is with high likelihood associated with the star. For the remaining stars the apparent 12-micron color of the 106 A, F, G, and K stars in the observing program is only 0.02 mag. Excess flux due to a Vega-like cloud which may surround some of the sources in the observing program, like Alpha Lyrae, is thus typically not detectable at 10 microns.
Aumann Hartmut H.
Probst Ronald G.
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