On the Deficiency of 8--10 Day Galactic Cepheids

Details On the Deficiency of 8--10 Day Galactic Cepheids On the Deficiency of 8--10 Day Galactic Cepheids

1997-07-27

arxiv.org/abs/astro-ph/9707297v1

Astronomy and Astrophysics

Astrophysics

Submitted to the Astrophysical Journal Letters

Scientific paper

10.1086/311062

The Galactic Cepheid period histogram has a strong dip between 8 and 10 days that has defied an explanation based on evolutionary and linear pulsation studies. We show here that this deficiency is caused by the instability of the nonlinear fundamental pulsation cycle in this period range. The strong metallicity dependence of this instability is consistent with the absence of a corresponding minimum in the Magellanic Cloud data. Our results also suggest that the Galactic Cepheids must have a large spread in metallicity.

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