On the period of the pulsating hydrogen-deficient star BD + 13 deg 3224

Details On the period of the pulsating hydrogen-deficient star BD + 13 deg 3224 On the period of the pulsating hydrogen-deficient star BD + 13 deg 3224

Mar 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982mnras.198..873k&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 198, Mar. 1982, p. 873-879.

Astronomy and Astrophysics

Astronomy

33

B Stars, Hot Stars, Periodic Variations, Stellar Oscillations, Stellar Spectrophotometry, Variable Stars, Giant Stars, Hydrogen, Stellar Evolution

Scientific paper

Recent observations of maxima of the pulsating early-type hydrogen-deficient star BD + 13 deg 3224 indicate a decrease in period since the discovery observations. The data are best fitted by a decrease rate of 46 x 10 to the -10 day/cycle, a value which is comparable with the rate derived from a theoretical study of the fast evolutionary phase of a post-giant helium star. Four-color data are averaged to give mean colors at 0.1 phase intervals around the pulsation cycle.

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