EDP Sciences
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Volume 390, Number 1, July IV 2002
Page(s) 133 - 137
Section Formation, structure and evolution of stars
DOI http://dx.doi.org/10.1051/0004-6361:20020654

A&A 390, 133-137 (2002)
DOI: 10.1051/0004-6361:20020654

Blazhko stars: Always distorted?

J. Jurcsik, J. M. Benko and B. Szeidl

Konkoly Observatory of the Hungarian Academy of Sciences, PO Box 67, 1525 Budapest, Hungary
    e-mail: jurcsik,szeidl@konkoly.hu

(Received 25 February 2002 / Accepted 4 April 2002)

A reexamination of the amplitude ratios of the photometric and radial velocity changes of Blazhko RRab stars in their different Blazhko phases shows that a normal amplitude ratio occurs near the phase of maximum amplitude. Checking the Fourier parameters of maximum amplitude light curves with different methods proved, however, that none of these light curves can be regarded as a normal RR Lyrae type light curve.

Key words: stars: variables: RR Lyr -- stars: oscillations -- techniques: photometric -- techniques: radial velocities

Offprint request: J. M. Benko, benko@konkoly.hu

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