Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....60..405h&link_type=abstract
Astronomy and Astrophysics, vol. 60, no. 3, Sept. 1977, p. 405-412. Research supported by the Science Research Council.
Astronomy and Astrophysics
Astronomy
13
Carbon Stars, Cosmic Dust, Giant Stars, Infrared Astronomy, M Stars, Stellar Magnitude, Astronomical Catalogs, Brightness, Galactic Radiation, Main Sequence Stars, Sky Surveys (Astronomy), Stellar Envelopes, Stellar Luminosity
Scientific paper
A reliable subcatalog of 216 of the brighter sources listed in the AFCRL Infrared Sky Survey is compiled and used to obtain an interim estimate of the composition of the IR sky. It is found that most of the bright IR sources are normal cool giant stars with no excess radiation at 4 microns and that stars of type M5 to M8 tend to have slight 11- and 20-micron excesses, which is consistent with the mass loss characteristic of their Mira-type variability. Based on differences in apparent luminosity at 4, 11, and 20 microns, all the sources in the subcatalog are divided into the categories 'stars', 'circumstellar dust shells', and 'dust clouds'. The distribution of dust clouds is shown to be consistent with a disk population having a surface density of about one per sq kpc for absolute magnitudes (at 20 microns) of -14.5 to -21.5, and the number of such clouds in the Galaxy is estimated to be of the order of 750.
Harris Stephen
Rowan-Robinson Michael
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