The evolutionary stage of an RRs star SX Phe

Details The evolutionary stage of an RRs star SX Phe The evolutionary stage of an RRs star SX Phe

May 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980cpsp.book..317s&link_type=abstract

In NASA. Goddard Space Flight Center Current Probl. in Stellar Pulsation Instabilities p 317-327 (SEE N80-25229 15-90)

Other

Lyra Constellation, Stellar Evolution, Stellar Mass, Variable Stars, Composition (Property), Periodic Variations, Scutum Constellation, Stellar Luminosity

Scientific paper

The evolutionary stage for a short period variable SX Phe was investigated. It was assumed that SX Phe is a mixed star with low metal abundance in which the material was mixed after the star evolved off the main sequence, and is in the second hydrogen burning stage. The validity of this hypothesis was examined by constructing two evolutionary sequences with (X,Z,M/solar mass) = (0.5,0.004,0.75) and (0.5,0.001,0.70) in the hydrogen burning phase and computed the pulsation period. Agreement between theoretical results and observational data was sufficient to conclude that the mixed model is actually adequate for SX Phe. The applicability of this model to other RRs stars is briefly discussed.

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