Petersen Diagram for RRd Stars in the Magellanic Clouds

• Autorzy: Popielski B. L. , Dziembowski W. A. , Cassisi S.
• Języki publikacji: EN

Abstrakty

EN

RRd stars from the Magellanic Clouds form a well-defined band in the Petersen diagram. We explain this observed band with our evolutionary and pulsation calculations with assumed metallicity [Fe/H]=(-2,-1.3). Vast majority of RRd stars from LMC is confined to a narrower range of (-1.7,-1.3). The width of the band, at specified fundamental mode period, may be explained by mass spread at given metallicity. The shape of the band reflects the path of RRd stars within the RR Lyr instability strip. We regard the success in explaining the Petersen diagram as a support for our evolutionary models, which yield mean absolute magnitude in the mid of the instability strip, ⟨M_V⟩, in the range 0.4 to 0.65 mag implying distance modulus to the LMC of 18.4 mag.

Słowa kluczowe

EN

stars: variables: RR Lyr; stars: oscillations; stars: abundances; Magellanic Clouds

• Wydawca: Copernicus Foundation for Polish Astronomy
• Czasopismo: Acta Astronomica
• Rocznik: 2000
• Tom: Vol. 50, No. 4
• Strony: 491--507
• Opis fizyczny: Bibliogr. 60 poz., rys., tab., wykr.

Twórcy

autor

Popielski B. L.

• Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warsaw, Poland

autor

Dziembowski W. A.

• Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warsaw, Poland
• Nicolaus Copernicus Astronomical Center, ul. Bartycka 18, 00-716 Warsaw, Poland

autor

Cassisi S.

• Osservatorio Astronomico Collurania, I-64100, Teramo, Italy

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