期刊
ASTROPHYSICAL JOURNAL
卷 611, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1086/423671
关键词
binaries; eclipsing-binaries; spectroscopic-stars; fundamental parameters-stars; individual (WR 20a)-stars; Wolf-Rayet
资金
- HST [HST-GO-09810.06-A]
- NASA through a grant from the Space Telescope Science Institute [HST-GO-09810.06-A]
- Association of Universities for Research in Astronomy
- NASA [NAS5-26555, NAG5-12212]
- Polish KBN [2P03D02124]
- Udalski and NSF [AST-0204908]
We present a high-precision I-band light curve for the Wolf-Rayet binary WR 20a, obtained as a subproject of the Optical Gravitational Lensing Experiment. Rauw et al. have recently presented spectroscopy for this system, strongly suggesting extremely large minimum masses of 70.7 +/- 4.0 and 68.8 +/- 3.8 M circle dot for the component stars, of the system, with the exact values depending strongly on the period of the system. We detect deep eclipses of about 0.4 mag in the light curve of WR 20a, confirming and refining the suspected period of P = 3.686 days and deriving an inclination angle of i = 74 degrees.5 +/- 2 degrees.0. Using these photometric data and the radial velocity data of Rauw et al., we derive the masses for the two components of WR 20a to be 83.0 +/- 5.0 and 82.0 +/- 5.0 M circle dot. Therefore,, WR 20a is confirmed to consist of two extremely massive stars and to be the most massive binary known with an accurate mass determination.
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