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Bet Mon A: historical evolution
Saturday 12 March 2011 by Jean-Noël Terry
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)