A rare reflection effect eclipsing sdB+dM binary: 2M 1533+3759

Details A rare reflection effect eclipsing sdB+dM binary: 2M 1533+3759 A rare reflection effect eclipsing sdB+dM binary: 2M 1533+3759

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010ap%26ss.329...87f&link_type=abstract

Astrophysics and Space Science, Volume 329, Issue 1-2, pp. 87-90

Astronomy and Astrophysics

Astrophysics

1

Stars: Binaries: Eclipsing, Stars: Individual: 2M 1533+3759

Scientific paper

In this paper, we report a rare reflection effect eclipsing sdB+dM binary, 2M 1533+3759. It is the seventh eclipsing sdB+dM binary that has been discovered to date. This system has an orbital period of 0.16177042 day and a velocity semi-amplitude of 71.1 km s-1. Using a grid of zero-metallicity NLTE model atmospheres, we derived T eff=29250 K, log g=5.58 and [He/H]=-2.37 from spectra taken near the reflection effection minimum. Lightcurve modeling resulted in a system mass ratio of 0.301 and an orbital inclination angle of 86.6°. The derived primary mass for 2M 1533+3759, 0.376±0.055 M &sun;, is significantly lower than the canonical mass (0.48 M &sun;) found for most previously investigated sdB stars. This implies an initial progenitor mass >1.8 M &sun;, at least a main sequence A star and perhaps even one massive enough to undergo non-degenerate helium ignition.

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