The pulsating extreme helium star BD + 13 deg 3224. II Ultraviolet fluxes and effective temperature variations

Details The pulsating extreme helium star BD + 13 deg 3224. II Ultraviolet fluxes and effective temperature variations The pulsating extreme helium star BD + 13 deg 3224. II Ultraviolet fluxes and effective temperature variations

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.209..387l&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 209, July 15, 1984, p. 387-400. Research supported by t

Astronomy and Astrophysics

Astronomy

35

B Stars, Radiant Flux Density, Stellar Oscillations, Stellar Temperature, Temperature Distribution, Ultraviolet Astronomy, Atmospheric Models, Radial Velocity, Stellar Atmospheres, Stellar Cores, Stellar Envelopes, Stellar Evolution, Stellar Mass

Scientific paper

BD + 13 deg 3224 (V652 Her) is characterized on the basis of low-resolution spectra obtained with the short-wavelength prime camera of the IUE on July 5, 1980, and optical spectra obtained at integration time 200 s with the 3.9-m Anglo-Australian Telescope on May 24 and 25, 1980. The results are presented in tables and graphs and discussed. Static plane-parallel LTE model atmospheres are used to calculate effective temperature and angular radius variations over a cycle of UV-flux variation. It is estimated that the star has mass 0.7 solar mass and lies at a distance of 1.5 + or - 0.1 kpc. It exhibits radial pulsations and has an envelope which contracts as the He-burning core grows; thus it resembles H-deficient star HD 144941.

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