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

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Abstract

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 ⊙, 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.

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Authors and Affiliations

  1. Department of Astronomy, University of Texas, Austin, TX, 78712, USA

    Bi-Qing For

  2. Steward Observatory, University of Arizona, Tucson, AZ, 85712, USA

    Elizabeth M. Green

  3. Département de Physique, Université de Montréal, Montréal, QC, H3C 3J7, Canada

    Gilles Fontaine

  4. Department of Physics and Astronomy, University of Georgia, Athens, GA, 30602, USA

    Scott Shaw

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  1. Bi-Qing For
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  2. Elizabeth M. Green
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  3. Gilles Fontaine
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  4. Scott Shaw
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Correspondence to Bi-Qing For.

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For, BQ., Green, E.M., Fontaine, G. et al. A rare reflection effect eclipsing sdB+dM binary: 2M 1533+3759. Astrophys Space Sci 329, 87–90 (2010). https://doi.org/10.1007/s10509-010-0280-7

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  • DOI: https://doi.org/10.1007/s10509-010-0280-7

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