Beat Cepheids as Probes of Stellar and Galactic Metallicity

Details Beat Cepheids as Probes of Stellar and Galactic Metallicity Beat Cepheids as Probes of Stellar and Galactic Metallicity

2006-11-27

arxiv.org/abs/astro-ph/0611809v2

Astrophys.J.660:723-731,2007

Astronomy and Astrophysics

Astrophysics

9 pages, 12 color figures (black and white version available from 1st author's website). With minor revisions. to appear in Ap

Scientific paper

10.1086/513071

The mere location of a Beat Cepheid model in a Period Ratio vs. Period diagram (Petersen diagram) puts very tight constraints on its metallicity Z. The Beat Cepheid Peterson diagrams are revisited with linear nonadiabatic turbulent convective models, and their accuracy as a probe for stellar metallicity is evaluated. They are shown to be largely independent of the helium content Y, and they are also only weakly dependent on the mass-luminosity relation that is used in their construction. However, they are found to show sensitivity to the relative abundances of the elements that are lumped into the metallicity parameter Z. Rotation is estimated to have but a small effect on the 'pulsation metallicities'. A composite Petersen diagram is presented that allows one to read off upper and lower limits on the metallicity Z from the measured period P0 and period ratio P1/P0.

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