The period-luminosity relation for Mira variables and the distance of the Large Magellanic Cloud

Astronomy and Astrophysics – Astronomy

Scientific paper

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Distance, Magellanic Clouds, Mira Variables, Stellar Luminosity, Variable Stars, Carbon Stars, Cepheid Variables, Least Squares Method, Main Sequence Stars, O Stars

Scientific paper

New data by Wood, Bessell & Paltoglou are shown to provide strong confirmation of the LMC Mira P-L relation discovered by Glass & Lloyd Evans. At K, both carbon and non-carbon Miras fit the same relation. Results from Cepheids, OB stars, main-sequence fitting, RR Lyrae and Mira variables are consistent with a true LMC distance modulus of 18.50±0.10 if <(Mv(RR)< = +0.6 at all metallicities including the metal-rich globular clusters containing the Miras studied by Menzies & Whitelock. However the results would also be consistent with the metal-rich RR Lyrae variables being ≡0.15 mag fainter than metal-poor ones. There is some suggestion of such a difference in ω Cen.

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