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Abstract:

Spectroscopic orbits are obtained for the first time for the three brightest WC + O binary systems in the LMC. An improved orbit is obtained for the bright WO + O system in the SMC. In one of the LMC systems the observed O companion is stationary; the remaining three systems show antiphased orbits of both components. Two of the LMC binary systems have very short periods (1.9 and 3.0 d), similar to the lower limit for periods of known WN + O and O + O binary systems in general. This means that orbital angular momentum must have been lost from the system in addition to that associated with the extreme mass loss of the present WC components, but not necessarily via mass transfer. On the basis of the double-line orbits for 10 known WC + O binaries in the Galaxy and the Magellanic Clouds, there emerges a continuous decrease of mass ratio M(WC)/M(O) with WC subtype, from 0.5 for WC8 to 0.2 for WC4, WO. Assuming that the initial mass ratio was ≳1, this implies that WC stars can evolve from WN stars and from cooler to hotter subtypes within the WC sequence, with mean mass-loss rate ∼4 × 10-5 M⊙ yr-1. It is noted that in WC + O binaries it is the mass ratio, not the mass, which probably best reflects the degree of evolution of the WC component to hotter subtypes, regardless of the initial mass.

Registro:

Documento: Artículo
Título:Wolf-Rayet stars in the Magellanic clouds. VI. Spectroscopic orbits of WC binaries and implications for W-R evolution
Autor:Moffat, A.F.J.; Niemela, V.S.; Marraco, H.G.
Filiación:Inst. Astronomia y Fis. del Espacio, Casilla de Correo 67, Suc. 28, 1428 Buenos Aires, Argentina
Département de Physique, Université de Montréal, C. P. 6128, Succ. A, Montréal, Que. H3C 3J7, Canada
Cerro Tololo Inter-Amer. Observatory, Natl. Optical Astron. Observatories
Universität Bonn
CIC, Prov. Buenos Aires, Argentina
CONICET, Argentina
Fac. de Ciencias Astronómicas, Universidad Nacional de La Plata, Argentina
Palabras clave:Galaxies: Magellanic Clouds; Stars: binaries; Stars: evolution; Stars: Wolf-Rayet
Año:1990
Volumen:348
Número:1
Página de inicio:232
Página de fin:241
DOI: http://dx.doi.org/10.1086/168232
Título revista:Astrophysical Journal
Título revista abreviado:Astrophys. J.
ISSN:0004637X
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v348_n1_p232_Moffat

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Citas:

---------- APA ----------
Moffat, A.F.J., Niemela, V.S. & Marraco, H.G. (1990) . Wolf-Rayet stars in the Magellanic clouds. VI. Spectroscopic orbits of WC binaries and implications for W-R evolution. Astrophysical Journal, 348(1), 232-241.
http://dx.doi.org/10.1086/168232
---------- CHICAGO ----------
Moffat, A.F.J., Niemela, V.S., Marraco, H.G. "Wolf-Rayet stars in the Magellanic clouds. VI. Spectroscopic orbits of WC binaries and implications for W-R evolution" . Astrophysical Journal 348, no. 1 (1990) : 232-241.
http://dx.doi.org/10.1086/168232
---------- MLA ----------
Moffat, A.F.J., Niemela, V.S., Marraco, H.G. "Wolf-Rayet stars in the Magellanic clouds. VI. Spectroscopic orbits of WC binaries and implications for W-R evolution" . Astrophysical Journal, vol. 348, no. 1, 1990, pp. 232-241.
http://dx.doi.org/10.1086/168232
---------- VANCOUVER ----------
Moffat, A.F.J., Niemela, V.S., Marraco, H.G. Wolf-Rayet stars in the Magellanic clouds. VI. Spectroscopic orbits of WC binaries and implications for W-R evolution. Astrophys. J. 1990;348(1):232-241.
http://dx.doi.org/10.1086/168232