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Title:
Double Degenerates among DA white dwarfs
Authors:
Bragaglia, Angela; Greggio, Laura; Renzini, Alvio; D'Odorico, Sandro
Affiliation:
AA(Bologna, Universita, Italy), AB(Bologna, Universita, Italy), AC(Bologna, Universita, Italy), AD(European Southern Observatory, Garching, Federal Republic of Germany)
Publication:
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 365, Dec. 10, 1990, p. L13-L17. Research supported by the Ministero dell'Universita e della Ricerca Scientifica e Tecnologica. (ApJL Homepage)
Publication Date:
12/1990
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
DEGENERATE MATTER, DOUBLE STARS, SUPERNOVAE, WHITE DWARF STARS, RED DWARF STARS, ROCHE LIMIT, STELLAR ENVELOPES, STELLAR MASS EJECTION
DOI:
10.1086/185877
Bibliographic Code:
1990ApJ...365L..13B

Abstract

The results of a spectroscopic survey of catalog white dwarfs in search of radial velocity variations indicative of a binary motion are reported. In a sample of 54 DA white dwarfs, one Double Degenerate (DD) system with a period of 1.15 days (the shortest period DD system yet discovered) is found. Two other excellent and two good DD candidates, and two white dwarf + red dwarf pairs were also found. If all the candidates should be confirmed, this would indicate a frequency of about 13 percent of interacting binaries in an unbiased sample of evolved stars, with a DD frequency of about 10 percent. These results suggest fairly large values for the common-envelope parameter alpha, implying that a source of energy other than orbital may be required to eject the envelope during common-envelope events. Finally, in combination with previous evidence our result implies that DDs with WD components of the DA variety are unlikely to be the precursors of Type I supernovae, but DDs with non-DA components remain very attractive candidates.

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