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V479 And: CV, LMXB, or Symbiotic?

Published online by Cambridge University Press:  17 January 2013

Diego González Buitrago ,
Gagik Tovmassian ,
Juan Echevarría ,
Sergey Zharikov ,
Takamitsu Miyaji ,
Andres Avilés  and
Gennady Valyavin
Diego González Buitrago
Affiliation:
Instituto de Astronomía, UNAM, Apdo. Postal 877, Ensenada, BC, 22800 Mexico
Gagik Tovmassian
Affiliation:
Instituto de Astronomía, UNAM, Apdo. Postal 877, Ensenada, BC, 22800 Mexico
Juan Echevarría
Affiliation:
Instituto de Astronomía, UNAM, Apdo. Postal 877, Ensenada, BC, 22800 Mexico
Sergey Zharikov
Affiliation:
Instituto de Astronomía, UNAM, Apdo. Postal 877, Ensenada, BC, 22800 Mexico
Takamitsu Miyaji
Affiliation:
Instituto de Astronomía, UNAM, Apdo. Postal 877, Ensenada, BC, 22800 Mexico
Andres Avilés
Affiliation:
Instituto de Astronomía, UNAM, Apdo. Postal 877, Ensenada, BC, 22800 Mexico
Gennady Valyavin
Affiliation:
Instituto de Astronomía, UNAM, Apdo. Postal 877, Ensenada, BC, 22800 Mexico
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Abstract

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V479 And is a 14.26 hour, close binary system, comprised of a G8-K0 star departing from the main sequence and a compact primary star accreting matter from the donor. The object is an X-ray source, modulated with the orbital period. This, and the presence of an intense He II line, leads us to speculate that the compact object is a magnetic white dwarf. However, we do not find strong constraints on the upper mass limit of the compact object, and we may have a neutron star in a low mass X-ray binary instead of a cataclysmic variable. The orbital period is certainly too short for the donor star to be an evolved giant star, so classifying this object as a symbiotic binary may be a big stretch; however there is an evidence that the mass transfer occurs via stellar winds, rather than through the L1 point of Roche filling secondary, a phenomenon more common for symbiotic stars.

Keywords

binaries: closespectroscopicsymbiotic — stars: novaecataclysmic variablesmagnetic fieldsindividual (V479 And, SDSS J001856.93+345444.3) — X-rays: binaries
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 7 , Issue S281: Binary Paths to Type Ia Supernovae Explosions , July 2011 , pp. 113 - 116
Copyright
Copyright © International Astronomical Union 2013

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