Open AccessThe Galactic hybrid Wolf–Rayet WN 7o/CE + O7V((f)) binary system WR 145
Author(s) -
Muntean V.,
Moffat A. F. J.,
Chené A. N.,
De La Chevrotière A.
Publication year - 2009
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 - 10.1111/j.1365-2966.2009.15288.x
Subject(s) - physics , wolf–rayet star , astrophysics , radial velocity , o type star , orbital inclination , stars , binary star , spectral line , astronomical spectroscopy , stellar classification , binary number , orbital elements , emission spectrum , astronomy , arithmetic , mathematics
A spectroscopic study of the binary Wolf–Rayet (WR)+O system WR 145 is performed, in order to determine the radial velocity orbits of the individual stars, the angle of orbital inclination and the stellar masses. The emission and absorption components are separated from the original spectra, allowing us to confirm the spectral classification WN 7o/CE of the hybrid WR component and to derive a spectral classification O7V((f)) for the O star. A study of the wind‐collision properties is performed. Fitting the radial velocity and full width at half‐maximum of the excess emission with Lührs’ model results in an inclination angle of i = 63° , leading to estimates of the stellar masses: M WR = 18 M ⊙ and M O = 31 M ⊙ . Both of these masses are compatible with those of other stars of similar types.