On the Distribution of the Modulation Frequencies of RR Lyrae Stars

• Autorzy: Jurcsik J. , Szeidl B. , Nagy A. , Sódor Á.
• Języki publikacji: EN

Abstrakty

EN

For the first time connection between the pulsation and modulation properties of RR Lyr stars has been detected. Based on the available data it is found that the possible range of the modulation frequencies, i.e., the possible maximum value of the modulation frequency depends on the pulsation frequency. Short period variables (P<0.4 d) can have modulation period as short as some days, while longer period variables (P>0.6 d) always exhibit modulation with P_mod>20 d. We interpret this tendency with the equality of the modulation period with the surface rotation period, because similar distribution of the rotational periods is expected if an upper limit of the total angular momentum of stars leaving the RGB exists. The distribution of the projected rotational velocities of red and blue horizontal branch stars at different temperatures shows a similar behavior as v_rot derived for RR Lyr stars from their modulation periods. This common behavior gives reason to identify the modulation period with the rotational period of the modulated RR Lyr stars.

Słowa kluczowe

EN

stars: variables: RR Lyr; stars: oscillations; stars: horizontal-branch

• Wydawca: Copernicus Foundation for Polish Astronomy
• Czasopismo: Acta Astronomica
• Rocznik: 2005
• Tom: Vol. 55, No. 3
• Strony: 303--314
• Opis fizyczny: Bibliogr. 31 poz., tab., wykr.

Twórcy

autor

Jurcsik J.

• Konkoly Observatory of the Hungarian Academy of Sciences, P.O. Box 67, H-1525 Budapest, Hungary

autor

Szeidl B.

• Konkoly Observatory of the Hungarian Academy of Sciences, P.O. Box 67, H-1525 Budapest, Hungary

autor

Nagy A.

• Konkoly Observatory of the Hungarian Academy of Sciences, P.O. Box 67, H-1525 Budapest, Hungary

autor

Sódor Á.

• Konkoly Observatory of the Hungarian Academy of Sciences, P.O. Box 67, H-1525 Budapest, Hungary

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