Astronomy and Astrophysics – Astronomy
Scientific paper
May 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980cpsp.book...41n&link_type=abstract
In NASA. Goddard Space Flight Center Current Probl. in Stellar Pulsation Instabilities p 41-54 (SEE N80-25229 15-90)
Astronomy and Astrophysics
Astronomy
Astrometry, Cepheid Variables, Radii, Stellar Mass, Periodic Variations, Pulses, Stellar Evolution, Stellar Luminosity
Scientific paper
It is possible to obtain the masses of Cepheid variables by several methods involving the pulsation theory. However, these masses are frequently smaller than those indicated by the theory of stellar evolution. The cause of this discrepancy is not fully understood. Since the pulsation theory indicates that there is a relation among the mass, the radius and the period, the discrepancy also manifests itself in the radii of these stars. With this in mind, radius determinations for two Cepheids, SU Cas and TU Cas, were undertaken. It is concluded that because of the agreement between the present radius and the beat radius of TU Cas, the pulsation theory is giving correct information about the radii of beat Cepheids. This implies that the luminosities of short period Cepheids have been overestimated. Thus, the solution to the mass discrepancy should perhaps be sought in the theory of stellar evolution or in the possibility of mass loss.
Niva G. D.
Schmidt Edward G.
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