Eclipsing Binaries in the Magellanic Clouds - Part Two - Absolute Dimensions and Distance Modulus for HV:5936 in the Large Magellanic Cloud

Details Eclipsing Binaries in the Magellanic Clouds - Part Two - Absolute Dimensions and Distance Modulus for HV:5936 in the Large Magellanic Cloud Eclipsing Binaries in the Magellanic Clouds - Part Two - Absolute Dimensions and Distance Modulus for HV:5936 in the Large Magellanic Cloud

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.265.1047b&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 265, NO. 4/DEC15, P.1047, 1993

Astronomy and Astrophysics

Astronomy

18

Scientific paper

Absolute dimensions and the distance modulus have been established for the early-type eclipsing binary HV 5936 in the LMC. Analyses of new radial velocities, reported here, and CCD light curves published by Jensen, Clausen & Gimenez yield masses of 7.2 +/- 0.9 and 3.3 +/- 0.5 M_sun_ for the primary and secondary components respectively. The corresponding radii are 4.6 +/- 0.3 and 5.7 +/- 0.3 R_sun_ with the cooler star filling its Roche lobe. More radial-velocity data are needed for definitive orbital parameters of HV 5936. The system appears to be similar to HV 2226 in the SMC in the sense of being a post-mass-transfer system, but due to case AB or B evolution rather than case A. A distance modulus of (m_V_ - M_V_)_0_ = 18.1 +/- 0.3 mag is derived, which marginally favours the `short' distance to the LMC noted by Westerlund of (m_V_ - M_V_)_0_ = 18.2mag; the range of (m_V_ - M_V_)_0_ values reported in Westerlund's review is 17.9 - 18.7 mag. As for HV 2226 in the SMC, the accuracy of the estimate of (m_V_ - M_V_)_0_ is limited by uncertainties of ~2000 K in the effective temperatures, and by the limited radial- velocity data.

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