Apsidal motion in massive close binary systems - I. HD 165052, an extreme case?

FERRERO, G.; GAMEN, R. C.; BENVENUTO, O; FERNANDEZ LAJUS, E.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY

WILEY-BLACKWELL PUBLISHING, INC

Lugar: Londres; Año: 2013 vol. 433 p. 1300 - 1311

0035-8711

We present a new set of radial velocity measurements of the spectroscopic binary HD 165052 obtained by disentangling high-resolution optical spectra. The longitude of the periastron (ϖ = 60 ± 2°) shows a variation with respect to previous studies. We have determined the apsidal motion rate of the system, dot{\varpi }=12.1 ± 0.3° yr-1, which was used to calculate the absolute masses of the binary components: M1 = 22.5 ± 1.0 M⊙ and M2 = 20.5 ± 0.9 M⊙. Analysing the separated spectra, we have reclassified the components as O7Vz and O7.5Vz stars.