The double-mode Cepheids

Details The double-mode Cepheids The double-mode Cepheids

Jun 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985cto..conf...17b&link_type=abstract

IN: Cepheids: Theory and observations; Proceedings of the Colloquium, Toronto, Canada, May 29-June 1, 1984 (A86-41131 19-90). Ca

Physics

43

Cepheid Variables, Pulsars, Pulse Duration, Stellar Spectrophotometry, Color-Magnitude Diagram, Modes, Radial Velocity, Stellar Luminosity

Scientific paper

Recent observational and theoretical results on double-mode Cepheids are reviewed. The likelihood that recently proposed candidate Cepheids are indeed Cepheids is evaluated. Periods, period ratios, and semi-amplitudes of the light and radial velocity variations of double-mode Cepheids are given. The physical and pulsational properties of double-mode Cepheids are discussed, reviewing evidence that these stars are Population I objects of high mass and that they all have the same mean effective temperature. The discovery of strong H-alpha emission occurring at seemingly random phases is addressed. Attempts to resolve the mass discrepancy problem of double-mode Cepheids, which results from observations showing that these Cepheids are indistinguishable from normal Cepheids of similar period, are reviewed along with attempts to find the cause of double-mode pulsation.

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