On Beta Cephei Stars: a Search for Beta Cephei Stars (original) (raw)
NASA/ADS
Abstract
The results of a photoelectric search for phei stars among a sample of 153 early 13 stars, found in the nearest associations and galactic clusters, are presented. This search yielded 24 new Cephei stars (including 5 tentative ones), thereby increasing the number of known Cephei stars to 41. These new observations have extended considerably the limits of spectral type, luminosity class, absolute magnitude, period, and rotational velocity for these variables. The limits now become 09.3-133 (spectral type), V-I (luminosity class), 3-10 hours (period), 0>300 km/sec (rotational velocity). An examination of the period-luminosity relation leads to the tentative conclusion that those stars with periods <Od.3 obey a p - 1 relation, but the stars with periods >0435 do not. H-R diagrams of p Cephei variables and "normal" stars for individual associations and galactic clusters show that the p Cephei stars occupy no preferred position in relation to normal stars, i.e., many of these "normal" stars are at the same stage of evolution as the p Cephei stars.
Publication:
The Astrophysical Journal Supplement Series
Pub Date:
August 1967
DOI:
Bibcode: