The Strange Close Binary V405 And: the Influence of Different Dynamos on the Components

Vida, Krisztián and Kriskovics, Levente and Oláh, Katalin Ilona and Korhonen, H. (2013) The Strange Close Binary V405 And: the Influence of Different Dynamos on the Components. CENTRAL EUROPEAN ASTROPHYSICAL BULLETIN, 37 (1). pp. 245-250. ISSN 1845-8319

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Abstract

V405 And is a fast-rotating (P = 0.465d) grazing eclipsing binary with two active components. Using multicolor photometric monitoring and radial velocity mea- surements, we find that the primary and the secondary components have masses of 0.49 and 0.21 solar masses, meaning that the primary probably possesses a radiative core and a convective envelope, while the secondary is fully convective. The radius of the low-mass component fits well the theoretical mass-radius relation. However, the radius of the pri- mary is significantly larger than the predicted value, in fact, the discrepancy is far the highest from the four similar objects known.

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