Physics
Scientific paper
Jun 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982esasp.176..301l&link_type=abstract
In ESA 3rd European IUE Conf. p 301-307 (SEE N83-11889 02-88)
Physics
B Stars, Periodic Variations, Stellar Luminosity, Stellar Temperature, Abundance, Atmospheric Ionization, Atmospheric Models, Hydrogen, Pulsed Radiation, Radial Velocity, Stellar Envelopes
Scientific paper
The IUE observations of BD + 13 deg 3224 are discussed. Luminosity varies by 33% of the maximum on a 0.1 day period. Plane-paralled LTE atmospheres in hydrostatic equilibrium indicate a mean effective temperature of 26.200 + or - 1000 K, log g = 4.0 + or - 0.2 and a hydrogen abundance of n(H)/n(He) = 0.01 (by number). Effective temperature and angular radius variations were obtained by interpolation between two LTE models. Coupling these results with ground-based radial velocity observations gives a stellar radius of 1.42 + or - 14R. The observed range in effective temperature is 4200 K, the observed radius variation being 0.167R. Temperature and pressure changes in the envelope suggest ionization to be important in the pulsation.
Hill Philip W.
Lynas-Gray Anthony E.
Schönberner Detlef
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