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IRAS variables as galactic structure tracers - Classification of the bright variablesThe 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.
Document ID
19930057620
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Allen, L. E. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Kleinmann, S. G. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Weinberg, M. D. (Massachusetts Univ. Amherst, United States)
Date Acquired
August 16, 2013
Publication Date
July 1, 1993
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 411
Issue: 1
ISSN: 0004-637X
Subject Category
ASTROPHYSICS
Funding Number(s)
CONTRACT_GRANT: F19628-91-K-0021
CONTRACT_GRANT: NAG5-1999
Distribution Limits
Public
Copyright
Other