Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...241.1045b&link_type=abstract
Astrophysical Journal, Part 1, vol. 241, Nov. 1, 1980, p. 1045-1049.
Astronomy and Astrophysics
Astronomy
16
Astronomical Spectroscopy, Binary Stars, Stellar Evolution, Ultraviolet Astronomy, Asymptotic Giant Branch Stars, Galactic Nuclei, Orbital Elements, Stellar Luminosity, Stellar Mass
Scientific paper
A spectroscopic study of the high-latitude B5 III star HD 137569, which has been identified as a Population II ultraviolet-bright star, is presented. High-dispersion spectra in the range 3700-4930 A were obtained with a Cassegrain spectrograph on a 1.88-m telescope which included the interstellar K line, C II at 4267 A, and all H and He I lines lying between H beta and H 16. Measurements indicate the system is a single-line spectroscopic binary with a period of 529.8 days and no evidence of a Balmer progression. An upper limit of 1.5 solar masses is adopted for the mass of the visible star, and it is found that the invisible star is most likely the more massive of the two. Consideration of the evolutionary status of the system indicates that HD 137569 can evolve as a single star if the present mass of the visible star does not exceed six solar masses and the evolutionary models do not underestimate the radius attained near the peak of the asymptotic giant branch.
Bolton Charles T.
Thomson James R.
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