The Cepheid instability strip and the calibration of the primary distance scale

Details The Cepheid instability strip and the calibration of the primary distance scale The Cepheid instability strip and the calibration of the primary distance scale

Jun 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.288..267s&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 288, Issue 1, pp. 267-272.

Astronomy and Astrophysics

Astronomy

11

Stars: Evolution, Stars: Oscillations, Cepheids, Distance Scale

Scientific paper

This study examines the possibility of galaxy-to-galaxy differences in the long-period Cepheid distributions of external galaxies. A simple theoretical framework is created and linear pulsation calculations are performed to model these distributions. The sturdy nature of the Cepheid period-luminosity (P-L) relation is affirmed, but both analytic arguments and the linear model grids point to potential systematic errors reaching up to a few tenths of a magnitude if the Cepheids in the calibrating and target galaxies have different distributions. We also point out some difficulties posed for stellar pulsation and evolution theory by the long-period Cepheids we have studied: the theoretical blue edge seems too hot and/or the inferred masses too large to account for the observed stars. Preliminary observational evidence is presented which marginally indicates the existence of two somewhat different types of distribution of long-period Cepheids in external galaxies, but further data are needed before this can be confirmed.

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