Candidate OH/IR stars in the outer parts of our Galaxy

Details Candidate OH/IR stars in the outer parts of our Galaxy Candidate OH/IR stars in the outer parts of our Galaxy

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...267...39b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 267, no. 1, p. 39-53.

Astronomy and Astrophysics

Astronomy

42

Hydroxyl Emission, Infrared Astronomy Satellite, Infrared Stars, Milky Way Galaxy, Stellar Luminosity, Asymptotic Giant Branch Stars, Galactic Evolution, Spatial Distribution

Scientific paper

The nature of a sample of IRAS candidate OH/IR stars outside the solar circle is investigated with additional information from near infrared photometry and radio OH(1612 MHz) measurements. It is shown that the sample is contaminated by a very large fraction (about 55 percent) of objects not on the Asymptotic-Giant Branch (AGB) and also by a small fraction of carbon-rich AGB stars (about 10 percent). In contradiction to Habing (1988), we conclude that there is no thick disc of OH/IR stars in the outer Galaxy and no strict cutoff of the thin disc. The small number of OH/IR stars in the outer Galaxy are most likely of a high mass (2-3 solar masses) based on their luminosity estimates in excess of 10 exp 4 solar luminosities. We also discuss the differences in appearance of the OH/IR stars in the outer Galaxy with those from the inner regions. We believe that the objects of larger galactic radii have lower dust-mass-loss rates and that this is caused by a lower metallicity of these stars.

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