On the role of duplicity in the Be phenomenon.
1. General considerations and the first attempt at a
3-D gas-dynamical modelling of gas outflow from hot and rapidly
rotating OB stars in binaries
Petr Harmanec1,2,
Dmitry V. Bisikalo3,
Alexander A. Boyarchuk3, and
Oleg A. Kuznetsov4
1
Astronomical Institute, Charles University Prague,
V Holesovickach 2, CZ-180 00 Praha 8, Bohemia - Czech Republic
2
Astronomical Institute, Academy of Sciences of the
Czech Republic, CZ-251 65 Ondrejov, Bohemia - Czech Republic
3
Institute of Astronomy, Russian Academy of Sciences,
Pyatnitskaya 48, Moscow 109017, Russia
4
Keldysh Institute for Applied Mathematics,
Miusskaya Square 4, Moscow 125047, Russia
This paper begins a new series of studies
devoted to a critical re-examination of the role of duplicity for the
Be phenomenon and for the variability patterns observed for many Be
stars. Based on both dynamical and energy considerations and a
numerical gas-dynamical modelling, a new hypothesis of the formation
of Be envelopes in binaries, via an outflow from a rapidly rotating B
star in a detached binary, is outlined. It is shown that such an
outflow is facilitated by the presence of a companion to the B star
and leads to the formation of an envelope but not to any significant
mass exchange between the binary components.
A&A 387, 580
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