Open AccessCCD photometry of variable stars in the Magellanic Clouds — V. The eclipsing binaries HV 1620 and HV 2241
Author(s) -
J. D. Pritchard,
William Tobin,
M. Clark,
E. F. Guinan
Publication year - 1998
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1046/j.1365-8711.1998.01486.x
Subject(s) - physics , photometry (optics) , astrophysics , large magellanic cloud , stars , astronomy , light curve , small magellanic cloud , variable star , telescope
Using improved techniques, high‐quality CCD uvbyVI C 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 = M 2 / M 1 = 0.68 ± 0.03, T eff,1 = 33 000 ± 4500 K and T eff,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.