UDK 53
UDK 520
UDK 521
UDK 523
UDK 524
UDK 52-1
UDK 52-6
GRNTI 41.00
GRNTI 29.35
GRNTI 29.31
GRNTI 29.33
GRNTI 29.27
GRNTI 29.05
OKSO 03.06.01
OKSO 03.05.01
OKSO 03.04.03
BBK 2
BBK 223
TBK 614
TBK 6135
BISAC SCI004000 Astronomy
BISAC SCI005000 Physics / Astrophysics
In the case of conservative mass exchange in a binary system in the Hertzsprung gap, the mass of the accreting star can increase by up to two times. The accreted matter brings Keplerian angular momentum with it. The meridional circulation transfers 80–85% of the incoming angular momentum to the surface of the accretor. The increase in the mass and angular momentum of the accretor occurs due to the loss of this part of the angular momentum. After the mass exchange is completed, most of the angular momentum is concentrated in the accreted layers. The accretor has a large enough angular momentum to maintain its status as a Be star during its subsequent evolution on the main sequence.
stars: binaries; emission-line; Be; early-type; rotation
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