Sa. Bell et al., ECLIPSING BINARIES IN THE MAGELLANIC CLOUDS .2. ABSOLUTE DIMENSIONS AND DISTANCE MODULUS FOR HV-5936 IN THE LARGE MAGELLANIC CLOUD, Monthly Notices of the Royal Astronomical Society, 265(4), 1993, pp. 1047-1052
Absolute dimensions and the distance modulus have been established for
the early-type eclipsing binary HV 5936 in the LMC. Analyses of new r
adial velocities, reported here, and CCD light curves published by Jen
sen, Clausen and Gimenez yield masses of 7.2 +/- 0.9 and 3.3 +/- 0.5 M
. for the primary and secondary components respectively. The correspon
ding radii are 4.6 +/- 0.3 and 5.7 +/- 0.3 R. with the cooler star fil
ling its Roche lobe. More radial-velocity data are needed for definiti
ve 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 modul
us 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 17.9-18.7mag. As for HV2226 in the SMC, the ac
curacy of the estimate of (m(V) - M(V))(0) is limited by uncertainties
of approximate to 2000 K in the effective temperatures, and by the li
mited radial-velocity data.