Photometry of masing and nonmasing OH/IR stars

Details Photometry of masing and nonmasing OH/IR stars Photometry of masing and nonmasing OH/IR stars

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj.....99.1232l&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 99, April 1990, p. 1232-1242. Research supported by the University of Minnesota.

Astronomy and Astrophysics

Astronomy

27

Infrared Photometry, Infrared Stars, Interstellar Masers, Water Masers, Infrared Astronomy Satellite, Interstellar Extinction, Stellar Color, Stellar Luminosity, Stellar Spectrophotometry

Scientific paper

Broadband infrared photometry performed on a sample of 60 stars with IRAS colors in the range displayed by Type II OH/IR stars is reported. All of the stars have been tested for 1612 MHz OH maser emission by Eder, Lewis, and Terzian (1988), but emission has been detected in only 27 of them. A morphological comparison is made between the masing and nonmasing groups to discern whether masering is correlated with near- and middle-infrared properties. Both groups have the same scale height perpendicular to the galactic plane and share many characteristics in common with the local Mira population. Where the IRAS colors of the two groups overlap significantly, no statistically significant difference in the K - L color distribution is found. Using theoretical models relating this color and the strength of the 9.7 micron silicate feature to the optical depth of the circumstellar dust shell, it is found that red giant dust shells need a minimum optical depth of tau(9.7) about 0.1 to support maser emission. Stars with a silicate feature in absorption only occur at low galactic latitudes, whereas stars with the feature in emission are found at all latitudes. It is concluded that interstellar extinction is partly responsible for this effect.

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