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Título del libro: B(e) Phenomenon: Forty Years Of Studies Título del capítulo: Short-Term Spectral Variability in the Binary FS CMa-Type Object MWC 728
Autores UNAM: SERGUEI JARIKOV;
Autores externos: Idioma: Año de publicación: 2017Palabras clave:
GALACTIC FSCMA STARS; PHOTOMETRY
Resumen:
We report the results of a long-term spectroscopic monitoring of the FS
CM-type object MWC 728. We found that it is a binary system with a B5 ve
(T-1,(eff) = 14000 +/- 1000 K) primary and a G8 III (T-2,(eff) similar
to 5000 K) secondary. Absorption lines of the cool star show regular
variations with a semi-amplitude of similar to 20 km s(-1) and a period
of 27.5 days. The system mass function is 2.3x10(-2) M-circle dot, and
its orbital plane is similar to 13 - 15 degrees tilted from the plane of
the sky. The hot star has a projected rotational velocity of similar to
110 km s(-1) which implies a nearly breakup rotation at the equator. We
detected strong variations of the Balmer and Her emission-line profiles
on timescales from days to years. This points out to a variable stellar
wind of the hot star in addition to the presence of a circum-primary
gaseous disk. The strength of the absorption-line spectrum along with
the optical and near-IR continuum suggest that the hot star contributes
similar to 60% of the V-band flux, the disk contributes similar to
30%, and the cool star similar to 10%. The binary system parameters,
along with the interstellar extinction, suggest a distance of similar to
1 kpc, that the cool star radius (similar to 8 R-circle dot) is smaller
than its Roche lobe, and that the companions' mass ratio is q similar to
0.5. Overall, the observed spectral variability and the presence of a
strong IR-excess are in agreement with a model of a close binary system
that has undergone a non-conservative mass-transfer.