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Title:
59 Cyg - A second Be binary with a hot, compact companion
Authors:
Maintz, M.; Rivinius, T.; Stahl, O.; Stefl, S.; Appenzeller, I.
Affiliation:
AA(Landessternwarte, Konigstuhl 12, D-69117, Heidelberg, Germany), AB(Landessternwarte, Konigstuhl 12, D-69117, Heidelberg, Germany), AC(Landessternwarte, Konigstuhl 12, D-69117, Heidelberg, Germany), AD(Astronomical Institute, Academy of Sciences of the Czech Republic, Ondrejov), AE(Landessternwarte, Konigstuhl 12, D-69117, Heidelberg, Germany)
Publication:
Publications of the Astronomical Institute of the Academy of Sciences of the Czech Republic (ISSN 1211-9105), Vol. 93, p. 21-28 (PAICz Homepage)
Publication Date:
12/2005
Origin:
AUTHOR
Keywords:
59 Cyg, Be + sdO binaries, evolved binaries, phi Per
Bibliographic Code:
2005PAICz..93...21M

Abstract

The Be star 59 Cyg was directly confirmed to be an evolved Be binary with a sdO companion (Be+sdO) by a weak HeII 4686 absorption. Orbital elements and stellar masses were determined. The orbital period was found to be 28.192+-0.004d with a slightly eccentric orbit of e = 0.11+-0.005. The mass of the secondary is located in the range between 1.56 and 2.3 Mȯ. Thus, 59 Cyg most likely resembles the well known Be+sdO binary phi Per in an earlier stage. Characteristic features for Be binaries with sdO or white dwarf companions were identified. They can be used for an easier identification of further evolved Be binaries or candidate systems.
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