Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...121...85g&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 121, no. 1, May 1983, p. 85-90. Research sponsored by the Deutsche Forschungsg
Astronomy and Astrophysics
Astrophysics
11
Binary Stars, Helium, Nonequilibrium Thermodynamics, O Stars, Stellar Spectra, Subdwarf Stars, Balmer Series, Iue, Line Spectra, Orbital Elements, Ultraviolet Spectra, Visible Spectrum
Scientific paper
Spectra of the binary system HD 128220 were taken in the UV and in the visual. The hot component - an O subdwarf - is analysed by means of non-LTE calculations. The cool companion has an effective temperature about 5500 ± 500K (Type G). The discussion of the stellar parameters arrives at results which agree with those derived from the mass function (Wallerstein and Wolff, 1966): if both components have about the same mass, these masses lie above 3 M_sun;. An O subdwarf of such a high mass has not yet been found and may be a supernova candidate. However, within the error margin of the orbital data also a mass ratio of MO/MG = 0.5 cannot be excluded, which would lead to stellar parameters which are more common for sdO's.
Gruschinske J.
Hamann Wolf-Rainer
Kaufmann J. P.
Kudritzki Rolf Peter
Simon K. P.
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