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

Bi Qing For, Elizabeth M. Green, Gilles Fontaine, Scott Shaw

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4 Scopus citations


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 Teff=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, is significantly lower than the canonical mass (0.48 M) found for most previously investigated sdB stars. This implies an initial progenitor mass >1.8 M, at least a main sequence A star and perhaps even one massive enough to undergo non-degenerate helium ignition.

Original languageEnglish (US)
Pages (from-to)87-90
Number of pages4
JournalAstrophysics and Space Science
Issue number1
StatePublished - 2010


  • Stars: binaries: eclipsing
  • Stars: individual: 2M 1533+3759

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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