Updated pulsation models for anomalous Cepheids

Details Updated pulsation models for anomalous Cepheids Updated pulsation models for anomalous Cepheids

2004-01-16

arxiv.org/abs/astro-ph/0401332v1

Astron.Astrophys.417:1101-1114,2004

Astronomy and Astrophysics

Astrophysics

14 pages, 17 postscript figures, accepted for publication on A&A

Scientific paper

10.1051/0004-6361:20040020

A theoretical investigation of the pulsation behavior of so-named ``anomalous'' Cepheids is presented. The study is based on nonlinear convective pulsation models with $Z$=0.0001 and 0.0004, mass in the range 1.3-2.2 Mo and various luminosity levels. Based on these computations, we derive period, bolometric light curves and the edges of the instability strip, showing that a variation of the metal abundance from Z=0.0001 to 0.0004 has quite small effects on these quantities. Then, using bolometric corrections and color-temperature transformations, we are able to provide the predicted relations connecting pulsational properties (periods, amplitudes) with magnitudes and colors in the various photometric bands. The theoretical pulsational scenario is compared to observed anomalous Cepheids in dwarf spheroidal galaxies and, in particular, the predicted mass-dependent Period-Magnitude-Amplitude and Period-Magnitude-Color relations are used to estimate individual mass values, as well as to discriminate between fundamental (F) and first-overtone (FO) pulsators.

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