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Astron. Astrophys. 321, 877-887 (1997)


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OH eruptive Mira stars

S. Etoka 1 and A.M. Le Squeren 2

1 Observatoire de Meudon, F-92195 Meudon Principal Cedex, France
2 GRAAL Université de Monptellier II, F-34095 Monptellier Cedex, France

Received 2 September 1996 / Accepted 5 November 1996

Abstract

We report the evolution of new OH flares detected from four Miras. These eruptive stars possess in common the fact that they have very thin envelopes. Except for one of them, each eruptive feature has a velocity near that of the star. Preferentially, the eruptive lines are at 1612 and 1665 MHz. It is likely that OH flares take place in a zone of the envelope closer to the star than standard emission.

Key words: stars: AGB, post-AGB – radio lines: stars – stars: individual: R Leo; U Her; R Cnc; R LMi


© European Southern Observatory (ESO) 1997

Online publication: June 30, 1998

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