Journal Article

Dipole low-order g-mode instability of metal-poor low-mass main-sequence stars due to the mechanism

Takafumi Sonoi and Hiromoto Shibahashi

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 422, issue 3, pages 2642-2647
Published in print May 2012 | ISSN: 0035-8711
Published online May 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2012.20827.x
Dipole low-order g-mode instability of metal-poor low-mass main-sequence stars due to the  mechanism

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We analysed the vibrational stability of metal-poor low-mass main-sequence stars due to the ɛ mechanism. Since outer convection zones of metal-poor stars are limited only to the very outer layers, uncertainty in the treatment of convection does not affect the result significantly. We found that the dipole g1 and g2 modes definitely become unstable due to the ɛ mechanism for . Besides that, we found that as the metallicity decreases the mass range of ɛ-mechanism instability extends toward higher mass.

Keywords: stars: abundances; stars: low-mass; stars: oscillations; stars: Population II

Journal Article.  3717 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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