Armagh Observatory Preprint Series No. 308
Nonadiabatic linear pulsation models for low-mass helium starsAuthors: C.S.Jeffery, H.Saio
Journal: 1999, MNRAS submitted
Abstract. Nonadiabatic linear pulsation models have been calculated for low-mass stars with effective temperatures between 16,000 and 35,000 K, and with surface gravities in the range 3
0.3, although the position of the red edge is sensitive to X. We have found that non-radial pulsations are also excited in the same instability region as radial pulsations.
The implications of these results for individual low-mass helium stars are discussed. It is concluded that Z-bump driven pulsations (radial and/or non-radial) may be excited in some helium-rich subdwarf B stars, representing a possible major extension to the class of variable stars represented by the prototype V652 Her.
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Dr C Simon Jeffery email: email@example.com WWW: http://star.arm.ac.uk/~csj/ Armagh Observatory, College Hill, tel: +44 1861 522928 Armagh BT61 9DG, Northern Ireland fax: +44 1861 527174