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- W2598055254 abstract "In this study the importance of close binary evolution for Be star formation was investigated. The Be star 59 Cygni was confirmed to be an evolved binary with a sdO companion. The companion was confirmed by a weak helium II absorption. Orbital elements and stellar masses were determined. In the spectrum of 59 Cygni, characteristic features were identified. These are a single-peaked emission component, a phase-locked V/R variability, and a knotty structure of the absorption lines. According to Stefl et al. (2000), these features are caused by a hot, compact companion (sdO or WD) that photoionizes a sector of the disc of the Be star. Assuming this model and a code of Hummel and Stefl (2001) the emission variability of 59 Cygni was successfully reproduced. The features, observed in the spectrum of 59 Cygni, were confirmed for the Be+sdO binary phi Persei and for HR2142, too. Hence, these features were taken as indicators for Be binaries with hot, compact companions. HR2142 was confirmed to be a Be+sdO binary. The spectral variability of further candidates was examined. It was suggested that FY CMa is a Be+sdO binary and that kappa Draconis is a Be+WD binary. The assumption that a fraction of the Be stars formed by mass and angular momentum transfer in close binary systems was confirmed." @default.
- W2598055254 created "2017-04-07" @default.
- W2598055254 creator A5090263793 @default.
- W2598055254 date "2003-01-01" @default.
- W2598055254 modified "2023-09-23" @default.
- W2598055254 title "Be binary stars with hot, compact companions" @default.
- W2598055254 doi "https://doi.org/10.11588/heidok.00004343" @default.
- W2598055254 hasPublicationYear "2003" @default.
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