Research Papers in Physics and Astronomy

 

Date of this Version

9-1-1993

Document Type

Article

Citation

THE ASTROPHYSICAL JOURNAL, 414: 310-315, 1993 September 1.

Comments

Copyright 1993 The American Astronomical Society. All rights reserved.

Abstract

It has been known for many decades that the spectral type of Cepheids at light maximum is constant with period. We use hydrodynamic pulsation models to explain this result in terms of the outward reach of the hydrogen ionization front. On the other hand, we show that, at minimum light, the Cepheid photospheric temperature is mainly a function of amplitude. A number of observed Cepheids have published temperatures that seem too hot at both maximum and minimum. We attribute this to an overestimation of the reddening for these stars. A list is given.

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