Astronomy and Astrophysics – Astronomy
Scientific paper
May 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...231..404v&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 231, no. 2, May 1990, p. 404-418. Research supported by NWO.
Astronomy and Astrophysics
Astronomy
55
Asymptotic Giant Branch Stars, Galactic Nuclei, Infrared Stars, Stellar Evolution, Infrared Astronomy Satellite, Mira Variables, O Stars, Stellar Luminosity, Stellar Spectra
Scientific paper
The analyses of the IRAS Galactic-bulge sources made by Habing (1986, 1987) are repeated using more accurate selection criteria and additional observations made available in the last few years. Thirty seven objects were selected that lie in the general direction of the Galactic bulge and display similar IRAS colors. Bolometric corrections at 12 microns and pulsation amplitudes of the observed sample were used to translate the observed 12-micron flux density distribution of this sample into a distribution of mean luminosities. The periods and luminosities for the OH/IR stars in the bulge of the Galaxy were found to fit very well into the period-luminosity relation found for Mira variables, confirming the hypothesis that the OH/IR stars in the Galactic bulge are evolved from the Miras. From the luminosity function, it is concluded that the Miras and the OH/IR stars in the Galactic bulge have low mass progenitors (1.0-1.4 solar mass) and are 7-10 Gyr old.
Habing Harm J.
van der Veen E. C. J. W.
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