On the stability and pulsations of Wolf–Rayet stars

Motivated by the discovery of fast pulsations in a Wolf–Rayet star, models of helium main-sequence stars are tested for stability with respect to radial perturbations. Dynamical strange-mode instabilities are identified, in addition to the instability of the fundamental mode driven by the classical...

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Bibliographic Details
Published in:Monthly notices of the Royal Astronomical Society 1993-05, Vol.262 (1), p.L7-L11
Main Authors: Glatzel, W., Kiriakidis, M., Fricke, K. J.
Format: Article
Language:English
Subjects:
Astronomy
Earth, ocean, space
Emission-line stars (of, be, luminous blue variables, wolf-rayet, etc.)
Exact sciences and technology
instabilities
Stars
stars: oscillations
stars: variables: other
stars: Wolf–Rayet
Variable and peculiar stars (including novae)
Citations: Items that cite this one
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Summary:Motivated by the discovery of fast pulsations in a Wolf–Rayet star, models of helium main-sequence stars are tested for stability with respect to radial perturbations. Dynamical strange-mode instabilities are identified, in addition to the instability of the fundamental mode driven by the classical ε-mechanism and discussed in recent publications. With respect to both range and strength, instabilities caused by the ε-mechanism are negligible when compared with strange-mode instabilities. The implication of these results for the interpretation of the observed variability in Wolf–Rayet stars is discussed, in particular with respect to mode identification and mass determinations.
ISSN:0035-8711
1365-2966
DOI:10.1093/mnras/262.1.L7