On the short-period type II Cepheid field stars

Details On the short-period type II Cepheid field stars On the short-period type II Cepheid field stars

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...311..305s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 311, Dec. 1, 1986, p. 305-316.

Astronomy and Astrophysics

Astrophysics

25

Cepheid Variables, Light Curve, Stellar Oscillations, Fourier Analysis, Hertzsprung-Russell Diagram, Stellar Composition

Scientific paper

Fourier decomposition parameters for the photoelectric light curves of 20 short-period type II Cepheids in the field are compared with the models of Hodson, Cox, and King, also subjected to Fourier analysis. The hydrodynamic light curves display sequences in the Fourier phases very reminiscent of the resonance progressions among classical Population I Cepheids with periods less than 10 days. The analysis shows that the resonance sequence among the type II stars differs in significant ways from its Population I counterpart, but that hydrodynamic models of the type II Cepheids are amazingly successful in depicting the light curve progression for these stars. The authors discuss the problems posed for theories of stellar and galactic evolution by the existence of disk, halo, and cluster pulsators with very similar light curves.

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