Close frequencies in pulsating stars: common and mysterious!

Details Close frequencies in pulsating stars: common and mysterious! Close frequencies in pulsating stars: common and mysterious!

2005-09-22

arxiv.org/abs/astro-ph/0509666v1

Mem.Soc.Ast.It.77:295-298,2006

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures. To appear in the Proceedings of the Workshop "Stellar pulsation and evolution" (June 19-24, 2005, Monte Po

Scientific paper

Amplitude and phase variability are commonly found in many different types of pulsating stars. This suggests a common, presently unknown physical origin. We have examined the phenomenon in several Delta Scuti stars with extensive data and find the beating of close frequencies to be responsible. This is demonstrated for the star FG Vir by testing the relationship between the observed amplitude and phase variations. Most close frequency pairs are situated near the observed or theoretically predicted frequencies of radial modes. The large number of detected close frequencies excludes the possibility of accidental frequency agreements.

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