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Evolution de Bet Mon A
samedi 12 mars 2011 par Jean-Noël Terry
(article à traduire en français)
Bet Mon A, HD45725, HR2356
Information :
A complex system : a triple system in which the three components are Be stars of about the same spectral type !
Seen in emission since 1925, but V/R variable.
V/R variation with a period of about 12.5 years has been suggested, but we need more steady observations.
What we know :
You van see Anne Cowley et al. (A&A, 22 203-208 (1973))
1905-1911 : V/R is near 1
1925 : Medium emission (Merrill 1925)
1938-1941 : Shell absorption faded
1942-1945 : Shell absorption recovered
1955 : Ha in very strong emission, Hb too
1960-1964 : Hydrogen shell components become very strong
1969-1975 : Emission lines as well as the shell component decrease
1982-1989 : Shell and strong emission star (Andrillat 1982, Maranon-1994, Hanuschik-1985, Dachs-1992, Slettebak 1993)
1998 : emission (Banerjee 2000)
2007 (march) : emission and continues in 2011.
(version 20110303)
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Fiches techniques Be
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