2005A&A...435.1013P


Query : 2005A&A...435.1013P

2005A&A...435.1013P - Astronomy and Astrophysics, volume 435, 1013-1030 (2005/6-1)

Constraining the mass transfer in massive binaries through progenitor evolution models of Wolf-Rayet+O binaries.

PETROVIC J., LANGER N. and VAN DER HUCHT K.A.

Abstract (from CDS):

Since close WR+O binaries are the result of a strong interaction of both stars in massive close binary systems, they can be used to constrain the highly uncertain mass and angular momentum budget during the major mass transfer phase. We explore the progenitor evolution of the three best suited WR+O binaries HD 90657, HD 186943 and HD 211853, which are characterized by a WR/O mass ratio of ∼0.5 and periods of 6...10 days. We are doing so at three different levels of approximation: predicting the massive binary evolution through simple mass loss and angular momentum loss estimates, through full binary evolution models with parametrized mass transfer efficiency, and through binary evolution models including rotation of both components and a physical model which allows to compute mass and angular momentum loss from the binary system as function of time during the mass transfer process. All three methods give consistently the same answers. Our results show that, if these systems formed through stable mass transfer, their initial periods were smaller than their current ones, which implies that mass transfer has started during the core hydrogen burning phase of the initially more massive star. Furthermore, the mass transfer in all three cases must have been highly non-conservative, with on average only ∼10% of the transferred mass being retained by the mass receiving star. This result gives support to our system mass and angular momentum loss model, which predicts that, in the considered systems, about 90% of the overflowing matter is expelled by the rapid rotation of the mass receiver close to the Ω-limit, which is reached through the accretion of the remaining 10%.

Abstract Copyright:

Journal keyword(s): stars: binaries: close - stars: evolution - stars: fundamental parameters - stars: rotation - stars: Wolf-Rayet

Simbad objects: 10

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Number of rows : 10
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 HD 63099 WR* 07 45 50.3991805440 -34 19 48.500286780 11.47 11.43 10.50 10.37   WC4+O7 108 0
2 HD 90657 WR* 10 26 31.4087563344 -58 38 26.182481568 9.53 10.07 9.65 9.84   WN5+O4-6 156 0
3 HD 94546 WR* 10 53 44.8196302 -59 30 46.694249 10.38 10.94 10.51 10.48   WN4+O8V 117 0
4 HD 311884 WR* 12 43 50.9991209208 -63 05 14.812489320 11.45 11.64 10.81 10.59   WN6+O5V 165 0
5 HD 320102 WR* 17 36 53.6232746376 -34 02 36.778424604 11.51 11.60 10.72 10.65   WN4+O5/7V 91 0
6 HD 186943 WR* 19 46 15.9393580368 +28 16 19.077099276 9.86 10.50 10.23     WN3+O9.5V 184 0
7 HD 193576 WR* 20 19 32.4229160448 +38 43 53.959035756 8.15 8.53 8.00     WN5+O6II-V 696 0
8 MR 114 WR* 22 09 33.4430950032 +57 44 30.527883600 12.78 12.946 12.078 11.853   WN4+O5V 138 0
9 HD 211853 WR* 22 18 45.6057566664 +56 07 33.898679364 8.84 9.39 9.00     WN6o+O6I 269 0
10 HD 214419 WR* 22 36 53.9548302648 +56 54 20.989190232 8.68 9.21 8.80     WN6o+O9Ib/II 369 1

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2023.02.01-19:23:59

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