Radial pulsation in luminous hot helium stars

Details Radial pulsation in luminous hot helium stars Radial pulsation in luminous hot helium stars

May 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...328..714s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 328, May 15, 1988, p. 714-725.

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47

B Stars, Hot Stars, Light Curve, Stellar Luminosity, Stellar Oscillations, Variable Stars, Abundance, Computational Astrophysics, Corona Borealis Constellation, Hertzsprung-Russell Diagram, Hydrogen, Radial Velocity

Scientific paper

Radial pulsations in hydrogen-deficient stars have been studied by calculating linear nonadiabatic pulsation frequencies and by reexamining the observed properties for systematic effects. The observed periods of the variable hydrogen-deficient stars decrease as a function of effective temperature. The observational surface gravity-effective temperature diagram seems to indicate that nonvariable extreme helium stars have smaller luminosity-to-mass ratios than variable helium stars. The nonadiabatic linear pulsation analysis shows that because of the extremely nonadiabatic pulsations, there exist unstable (overstable) pulsation modes even in very high effective temperature models up to of about 30,000 K. They are excited by the usual kappa and gamma mechanisms mainly in the second helium ionization zone. Applying the theoretical results to the pulsating luminous hot helium stars, pulsation masses are obtained. The masses of the visible components of hydrogen-deficient binaries are systematically higher than the masses of the single extreme helium stars.

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