Theoretical fits of the δCephei light, radius and radial velocity curves

Details Theoretical fits of the δCephei light, radius and radial velocity curves Theoretical fits of the δCephei light, radius and radial velocity curves

2007-11-19

arxiv.org/abs/0711.2857v1

Astronomy and Astrophysics

Astrophysics

accepted for publication on ApJ Letters

Scientific paper

10.1086/526518

We present a theoretical investigation of the light, radius and radial velocity variations of the prototype $\delta$ Cephei. We find that the best fit model accounts for luminosity and velocity amplitudes with an accuracy better than $0.8\sigma$, and for the radius amplitude with an accuracy of $1.7\sigma$. The chemical composition of this model suggests a decrease in both helium (0.26 vs 0.28) and metal (0.01 vs 0.02) content in the solar neighborhood. Moreover, distance determinations based on the fit of light curves agree at the $0.8\sigma$ level with the trigonometric parallax measured by the Hubble Space Telescope (HST). On the other hand, distance determinations based on angular diameter variations, that are independent of interstellar extinction and of the $p$-factor value, indicate an increase of the order of 5% in the HST parallax.

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