Abstract
We have analyzed the broad-band light curve of the massive eclipsing binary BAT99-129, which is located in the Large Magellanic Cloud and consists of WN3(h) and O5V components. The light curve was obtained as part of the MACHO project. The dense extended atmosphere of the Wolf-Rayet (WR) star makes it impossible to apply a standard parametric model, such as that of Wilson and Devinney, to analyze the light curve. We reconstructed the distributions of the brightness and absorption across the disk of the WR component by directly solving the integral equations describing the eclipses in the system. Our analysis yields reliable estimates of the system’s orbital parameters and the parameters of its components. The orbital inclination is 78°, the size of the orbit 28.5 R ⊙, and the radius of the O component R O = 7.1 R ⊙. The size of the WR core, which is opaque in the optical continuum, is R WR = 3.4 R ⊙, and the brightness temperature at the center of the WR-component disk is T br = 45 000 K. We discuss possible uncertainties in the parameters obtained. The derived information is used to draw conclusions about the system’s evolutionary status.
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References
W.-R. Hamann and G. Gräfener, Astron. Astrophys. 427, 697 (2004).
H. N. Russell and J. E. Merrill, Contrib. Princeton Univ. Obs., No. 26 (1952).
R. E. Wilson, Astrophys. J. 234, 1054 (1979).
C. Foellmi, A. F. J. Moffat, and S. V. Marchenko, Astron. Astrophys. 447, 667 (2006).
I. I. Antokhin, A. M. Cherepashchuk, and A. G. Yagola, Astrophys. Space Sci. 254, 111 (1997).
I. I. Antokhin and A. M. Cherepashchuk, Astron. Zh. 78, 432 (2001) [Astron. Rep. 45, 371 (2001)].
A. M. Cherepashchuk, Astron. Rep. 45, 120 (2001)]; A. M. Cherepashchuk, Sov. Astron. 9, 725 (1975).
A. V. Gocharskii, A. M. Cherepashchuk, and A. G. Yagola, Ill-Posed Problems of Astrophysics (Nauka, Moscow, 1985) [in Russian].
A. N. Tikhonov, Dokl. Akad. Nauk SSSR 39, 195 (1943).
A. M. Cherepashchuk, Astron. Zh. 50, 879 (1973) [Sov. Astron. 17, 555 (1973)].
I. I. Antokhin, Astron. Zh. (2007) (in press).
A. V. Gocharskii, A. M. Cherepashchuk, and A. G. Yagola, C Numerical Methods of Solution of Inverse Problems of Astrophysics (Nauka, Moscow, 1978), p. 224 [in Russian].
A. M. Cherepashchuk, J. A. Eaton, and Kh. F. Khaliullin, Astrophys. J. 281, 774 (1984).
G. Meynet and A. Maeder, Astron. Astrophys. 429, 581 (2005).
G. Meynet, A. Maeder, D. Schaerer, and C. Charbonnel, Astron. Astrophys., Suppl. Ser. 103, 97 (1994).
G. Meynet and A. Maeder, Astron. Astrophys. 361, 101 (2000).
A. V. Tutukov, L. G. Yungel’son, and A. Ya. Klyaiman, Nauchn. Inform. Astron. Sov. Akad. Nauk SSSR 27, 3 (1973).
Ph. Massey, J. Puls, A. W. A. Pauldrach, et al., Astrophys. J. 627, 477 (2005).
A. Herrero, in IAU Symp. 212: A Massive Star Odyssei: From Main Sequence to Supernova, Ed. by K. A. van der Hucht, A. Herrero, and C. Esteban (Asron. Soc. Pac., San Francisco, 2003), p. 3.
A. G. Masevich and A. V. Tutukov, Evolution of Stars: Theory and Observations (Nauka, Moscow, 1988) [in Russian].
D. Vanbeveren and C. de Loore, Astron. Astrophys. 290, 129 (1994).
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Original Russian Text © I.I. Antokhin, A.M. Cherepashchuk, 2007, published in Astronomicheskiĭ Zhurnal, 2007, Vol. 84, No. 6, pp. 542–556.
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Antokhin, I.I., Cherepashchuk, A.M. The eclipsing WN3(h)+O5V binary BAT99-129: Light curve analysis and parameters of its components. Astron. Rep. 51, 486–499 (2007). https://doi.org/10.1134/S106377290706008X
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DOI: https://doi.org/10.1134/S106377290706008X