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Armagh Observatory Preprint Series No. 308
Nonadiabatic linear pulsation models for low-mass helium stars
Authors: C.S.Jeffery, H.SaioJournal: 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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