IRAS variables as galactic structure tracers - Classification of the bright variables

Details IRAS variables as galactic structure tracers - Classification of the bright variables IRAS variables as galactic structure tracers - Classification of the bright variables

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...411..188a&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 411, no. 1, p. 188-199.

Astronomy and Astrophysics

Astronomy

16

Asymptotic Giant Branch Stars, Galactic Structure, Infrared Astronomy Satellite, Infrared Stars, Mira Variables, Astronomical Catalogs, Carbon Stars, Milky Way Galaxy, Sky Surveys (Astronomy)

Scientific paper

The characteristics of the 'bright infrared variables' (BIRVs), a sample consisting of the 300 brightest stars in the IRAS Point Source Catalog with IRAS variability index VAR of 98 or greater, are investigated with the purpose of establishing which of IRAS variables are AGB stars (e.g., oxygen-rich Miras and carbon stars, as was assumed by Weinberg (1992)). Results of the analysis of optical, infrared, and microwave spectroscopy of these stars indicate that, out of 88 stars in the BIRV sample identified with cataloged variables, 86 can be classified as Miras. Results of a similar analysis performed for a color-selected sample of stars, using the color limits employed by Habing (1988) to select AGB stars, showed that, out of 52 percent of classified stars, 38 percent are non-AGB stars, including H II regions, planetary nebulae, supergiants, and young stellar objects, indicating that studies using color-selected samples are subject to misinterpretation.

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