Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...267l..31h&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 267, no. 1, p. L31-L34.
Astronomy and Astrophysics
Astrophysics
41
Carbon Stars, Stellar Spectra, Visible Spectrum, White Dwarf Stars, Companion Stars, Emission Spectra, Line Spectra
Scientific paper
We report the identification of PG0824+289 with a unique double-lined spectroscopic binary consisting of a hot DA white dwarf and a dwarf carbon star. Balmer line emission and possible spectrum variability indicate a close system. A model atmosphere analysis of the hot DA star results in T(eff) = 40,000 K and Mv = 9.2 m. The dwarf carbon star contributes 25 percent to the (Greenstein) v magnitude of 14.22 m from which an absolute magnitude of Mv = 10.4 m results. It is only the sixth dwarf carbon star discovered so far and the first one in a double-lined spectroscopic binary. It bears some resemblance to the prototype carbon dwarf G77-61 and is the first system that allows the binary model for the origin of the dwarf carbon stars to be tested in detail. While all other known dC stars belong to population II, the small proper motion of PG0824+289 indicates that it is a population I star.
Bade Norbert
Heber Uli
Jordan Stefan
Voges Wolfgang
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