Non-adiabatic linear pulsation models for low-mass helium stars

Details Non-adiabatic linear pulsation models for low-mass helium stars Non-adiabatic linear pulsation models for low-mass helium stars

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999mnras.308..221j&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 308, Issue 1, pp. 221-227.

Astronomy and Astrophysics

Astronomy

11

Scientific paper

Non-adiabatic linear pulsation models have been calculated for low-mass stars with effective temperatures between 16000 and 35000K, and with surface gravities in the range 30.3, 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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