Mira Variables explained by a planetary companion interaction: A means to drop the pulsation paradigm?

Free access article

Issue		A&A Volume 397, Number 3, January III 2003


Page(s)		943 - 950
Section		Stellar atmospheres
DOI		10.1051/0004-6361:20021540

A&A 397, 943-950 (2003)
DOI: 10.1051/0004-6361:20021540

Mira Variables explained by a planetary companion interaction: A means to drop the pulsation paradigm?

P. Berlioz-Arthaud

CRAL-Observatoire de Lyon, 9 Av. Charles André, 69561 Saint Genis Laval Cedex, France
(Received 29 July 2002 / Accepted 30 September 2002 )

Abstract
We emphasize the limits of the classical paradigm explaining the periodic appearance of emission lines by shock waves induced by radial periodic pulsations. In particular, we argue that, if pulsation occurs, it would not be purely radial and the light curve resulting from the contribution of zones at different phases would have a shape different from what we actually observe. The discovery of low mass companions to numerous G stars, some of them very close to the star, led us to look at the fate and the influence of this companion when the star becomes a giant. After Rudnitskij 2000), we suggest that the behavior of the Mira variables is mainly due to the presence of a companion in the tenuous atmosphere of the giant instead of the effect of a pulsating atmosphere explaining the presence of emission lines and the periodicity of these variables. We argue that the presence of a companion may account for the shape of the light curve and the observed phase lag between the maximum visual and the maximum maser light.

Key words: stars: late-type -- stars: oscillations -- stars: variables: general

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