Journal Article

CCD photometry of variable stars in the Magellanic Clouds — V. The eclipsing binaries HV 1620 and HV 2241

J. D. Pritchard, W. Tobin, M. Clark and E. F. Guinan

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 297, issue 1, pages 278-290
Published in print June 1998 | ISSN: 0035-8711
Published online June 1998 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1046/j.1365-8711.1998.01486.x
CCD photometry of variable stars in the Magellanic Clouds — V. The eclipsing binaries HV 1620 and HV 2241

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Using improved techniques, high-quality CCD uvbyVIC photometry has been obtained for the 14th magnitude eclipsing binaries HV 1620 in the Small Magellanic Cloud (SMC) and HV 2241 in the Large Magellanic Cloud (LMC). IUE ultraviolet spectrophotometry was also obtained. These data have been analysed using the Wilson & Devinney synthetic light-curve code and Kurucz model atmospheres. Both systems are semi-detached and appear to have undergone mass exchange. In HV 1620 the mass ratio and the effective temperatures of the primary and secondary are q = M2/M1 = 0.68 ± 0.03, Teff,1 = 33 000 ± 4500 K and Teff,2 = 24 000 ± 3500 K. The corresponding values for HV 2241 are 0.53 ± 0.01, 27 000 ± 3000 K and 20 200 ± 1500 K. Using the radial-velocity curves obtained by Niemela & Bassino with a 1-m telescope, we find that both systems are massive, as expected. Reddening considerations suggest both systems may lie towards the rear of their respective Clouds.

Keywords: binaries: eclipsing; stars: early-type; stars: fundamental parameters; stars: individual: HV 1620; stars: individual: HV 2241; Magellanic Clouds

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Subjects: Astronomy and Astrophysics

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