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Apsidal motion in southern eccentric eclipsing binaries: GL Car, QX Car, NO Pup and V366 Pup
The study of apsidal motion in eccentric eclipsing binaries (EEB)provides an important observational test of theoretical models ofstellar structure and evolution. The Southern hemisphere contains manyinteresting and also neglected binary systems. New accuratephotoelectric times of minimum light have been obtained for the detachedearly-type Southern hemisphere EEB GL Car (P = 2.42d,e = 0.15), QX Car(4.48d, 0.15), NO Pup (1.26d, 0.13) and V366 Pup (2.48d, 0.47). The O-Cdiagrams are analysed using all reliable timings found in the literatureand improved or new values for the elements of the apsidal motion arecomputed. We find more precise, relatively short periods of apsidalmotion of about 25.2, 362, 38.3 and 285yr and corresponding internalstructure constants, log k2, -1.88, -2.08, -2.32 and -2.38for GL Car, QX Car, NO Pup and V366 Pup, respectively, with theassumption that the component stars rotate pseudo-synchronously. Therelativistic effects are small, being about 3-12 per cent of the totalapsidal motion rate in all systems.Based on observations made at the South Africa Astronomical Observatory,Sutherland, South Africa and Mt John University Observatory, Universityof Canterbury, Lake Tekapo, New Zealand.E-mail: wolf@cesnet.cz
| Absolute dimensions of eclipsing binaries. I - The early-type detached system QX Carinae
An analysis of radial velocities derived from high dispersioncoudespectrograms and uvby light curves yields accurate absolutedimensions for the double lined B2V eclipsing binary QX Car. Within theframework of Hejlesen's (1980) theoretical stellar models, a chemicalcomposition (Y/Z) of (0.28/0.025) and an age of 8.0 + or - 2.0 millionyears are determined. A combination of all available data leads to thedetermination of an apsidal motion period of 354 + or - 4 years and adensity concentration coefficient of -2.07 + or - 0.05. The latter is inexcellent agreement with the theoretical results of Hejlesen (1983) forthe observed mass and age.
| Four-Colour Photometry of Eclipsing Binaries - Part Fourteen B
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1982A&AS...49..571A&db_key=AST
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