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Accurate Fourier Decomposition of Cepheid Radial Velocity Curves

Published online by Cambridge University Press:  12 April 2016

P. Moskalik ,
T. Krzyt ,
N. A. Gorynya  and
N. N. Samus
P. Moskalik
Affiliation:
Copernicus Astron. Center, ul. Bartycka 18, 00-716 Warsaw, Poland
T. Krzyt
Affiliation:
Polish Police Force, Warsaw, Poland
N. A. Gorynya
Affiliation:
Institute of Astronomy, Russian Acad. Sci., ul. Pyatnitskaya 48, Moscow 109017, Russia
N. N. Samus
Affiliation:
Institute of Astronomy, Russian Acad. Sci., ul. Pyatnitskaya 48, Moscow 109017, Russia

Abstract

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The shapes of light curves and of radial velocity curves are two main predictions of the hydrodynamical models of Cepheids. Of the two, the velocity curves are more robust numerically and therefore, more suitable for comparison with the observations. In this report, we present accurate Fourier parameters for an extensive set of classical Cepheid velocity curves. Published radiative models reproduce the observations very well, with only small discrepancies present. We estimate the center of the ω2 = 2ω0 resonance to occur at Pr = 9.947 ± 0.051 day

Type
Part 3. Cepheids, RR Lyrae Stars, Distance Scales
Information
International Astronomical Union Colloquium , Volume 176: The Impact of Large-Scale Surveys on Pulsating Star Research , 2000 , pp. 233 - 234
Copyright
Copyright © Astronomical Society of the Pacific 2000

References

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