Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...250..351l&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 250, no. 2, Oct. 1991, p. 351-360.
Astronomy and Astrophysics
Astronomy
5
Hydroxyl Emission, Infrared Sources (Astronomy), M Stars, Mass To Light Ratios, Stellar Luminosity, Infrared Photometry, Infrared Spectroscopy, Stellar Envelopes, Stellar Evolution
Scientific paper
This study presents photometric and spectroscopic data, obtained in the infrared bands JHKLM and covering an interval of about 2000 d, for OH/IR 285.05 + 0.07 and OH/IR 286.50 + 0.06. Both objects are variable, the first one with a characteristic time of about 1500 d and a bolometric amplitude of about 1 mag, and the second one with a period of 515 +/-6 d, and an amplitude of 1.0 mag. The evolutionary status of these objects is discussed. OH/IR 185.05 + 0.07 may be a core-burning supergiant whereas OH/IR 186.50 + 0.06 is most likely an AGB star radiating near or above the maximum luminosity expected for a star with an electron-degenerate carbon-oxygen core. It is possible that the latter has developed an electron-degenerate oxygen-neon core. The existence of AGB stars with a period longer than 800 d is discussed, and it is suggested that galactic type-II OH/IR sources with a period longer than 800 d could be only supergiants.
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