Light-Time Effects, Multimode Pulsations and Binarity

Details Light-Time Effects, Multimode Pulsations and Binarity Light-Time Effects, Multimode Pulsations and Binarity

Jul 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aspc..335...85b&link_type=abstract

The Light-Time Effect in Astrophysics, Proceedings of ASP Conference Series, Vol. 335, held in Brussels 19-22 July 2004. Edited

Astronomy and Astrophysics

Astrophysics

3

Scientific paper

The determination of O-C variations in single-period, large-amplitude pulsating stars can be considered a standard technique. We extend the method to multiperiodic, small-amplitude pulsators with as many as 60 simultaneously excited pulsation modes. The derived O-C variations are reliable if three conditions are met: (i) the multifrequency solution describes the observed light variations well, even if it is not complete, (ii) the observations cover many months for at least one year, (iii) the pulsation of the star is stable over the time interval examined.
The method is demonstrated for two δ Scuti variables. For the θ2 Tau binary system, the light-time shifts found for the low frequencies agree with those predicted for the primary, while the shifts for the high frequencies are compatible with the fainter secondary. For FG Vir, the phasing is constant to a few seconds over the two years covered.
Finally, the problem of very close frequencies is discussed.

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