Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991acasn..32...17s&link_type=abstract
(Acta Astronomica Sinica, vol. 32, no. 1, 1991, p. 17-27) Chinese Astronomy and Astrophysics (ISSN 0275-1062), vol. 15, Sept. 19
Astronomy and Astrophysics
Astronomy
4
Hydroxyl Emission, Infrared Photometry, Interstellar Masers, Stellar Evolution, Infrared Astronomy Satellite, Infrared Spectra, Infrared Stars, Mira Variables, Red Giant Stars, Stellar Luminosity
Scientific paper
Results of near-infrared observations of 17 stars of different OH maser types including their J, H, and K magnitudes and fluxes are presented. Their IRAS counterparts are identified. From a simultaneous analysis of their near-infrared, far-infrared and OH radio data are used to derive their near- and far-infrared luminosities L1 and L2, infrared gradients S1, characteristics S10 of the silicate 10-micron feature, and the mass loss rate of the central star M. It is found that, for all OH maser types, L1, L2, S1 and S10 all tend to increase with increasing mass loss rate. This shows that, for the red giants in the AGB subbranch, there exists indeed a tightly connected evolutionary sequence from optical Mira stars to optically invisible OH/IR stars, from OH-1665/1667 masers to OH-1612 masers.
Fang Geng
Sun Jin
Wei Han
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