V479 And: CV, LMXB, or Symbiotic?
Abstract
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.
- Publication:
-
Binary Paths to Type Ia Supernovae Explosions
- Pub Date:
- January 2013
- DOI:
- 10.1017/S1743921312014780
- Bibcode:
- 2013IAUS..281..113B
- Keywords:
-
- binaries: close;
- spectroscopic;
- symbiotic;
- stars: novae;
- cataclysmic variables;
- magnetic fields;
- individual (V479 And;
- SDSS J001856.93+345444.3);
- X-rays: binaries