Abstract
The narrow-band λ4244 Å continuum light curve of the eclipsing binary V444 Cyg, which has a Wolf-Rayet component, is interpreted assuming that the brightness distribution and absorption in the WN5 star's disk are monotonic, non-increasing, convexo-concave, non-negative functions. The convex and concave parts of these functions correspond to the core of the WN5 star and its extended photosphere and atmosphere, respectively. The radius and brightness temperature of the opaque core of the WN5 star are r coreWN5 ≃ 4R ⊙ and T corebr >52000 K, respectively. The stellar wind is characterized by an accelerated radial outflow. Acceleration of the wind persists at large distances from the center of the star. A crude Lamers-law fit to the reconstructed velocity field in the wind yields an acceleration parameter β=1.58–1.82.
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References
W.-R. Hamann, L. Koesterke, and G. Grefener, in Wolf-Rayet Phenomena in Massive Stars and Starburst Galaxies (IAU Symposium 193), Ed. by K. A. van der Hucht, G. Koenigsberger, and Ph. R. J. Eenens (Astronomical Society of the Pacific, 1999), p. 138.
D. J. Hillier and D. L. Miller, Astrophys. J. 519, 354 (1999).
A. M. Cherepashchuk, Sov. Astron. 9, 725 (1975).
A. M. Cherepashchuk, J. A. Eaton, and Kh. F. Khaliullin, Astrophys. J. 281, 774 (1984).
I. I. Antokhin, A. M. Cherepashchuk, and A. G. Yagola, Astrophys. Space Sci. 254, 111 (1997).
A. V. Goncharskii, A. M. Cherepashchuk, and A. G. Yagola, Ill-posed Problems in Astrophysics [in Russian] (Nauka, Moscow, 1985).
Kh. F. Khaliullin, Astron. Zh. 57, 195 (1974).
A. M. Cherepashchuk, in Wolf-Rayet Stars: Binaries, Colliding Winds, Evolution (IAU Symposium 163), Ed. by K. A. van der Hucht and P. M. Williams (Kluwer, Dordrecht, 1995), p. 262.
N. St-Louis, A. F. J. Moffat, L. Lapointe, et al., Astrophys. J. 410, 342 (1993).
A. M. Cherepashchuk, Astron. Zh. 67, 955 (1990), [Sov. Astron. 34, 481 (1990)].
T. J. Harries, D. J. Hillier, and I. D. Howarth, Mon. Not. R. Astron. Soc. 296, 1072 (1998).
A. M. Cherepashchuk, G. Koenigsberger, S. V. Marchenko, and A. F. J. Moffat, Astron. Astrophys. 293, 142 (1995).
L. Hartmann, Astrophys. J. 221, 193 (1978).
W.-R. Hamann and E. Schwarz, Astron. Astrophys. 261, 523 (1992).
I. I. Antokhin and A. M. Cherepashchuk, Astron. Zh. 78(4), 313 (2001) [Astron. Rep. 45, 269 (2001)].
A. N. Tikhonov, Dokl. Akad. Nauk SSSR 39, 195 (1943).
N. Langer, Astron. Astrophys. 252, 669 (1991).
I. I. Antokhin, S. V. Marchenko, and A. F. J. Moffat, in Wolf-Rayet Stars: Binaries, Colliding Winds, Evolution (IAU Symposium 163), Ed. by K. A. van der Hucht and P. M. Williams (Kluwer, Dordrecht, 1995), p. 520.
A. M. Cherepashchuk, in Wolf-Rayet Stars in the Framework of Stellar Evolution (33rd Liège International Astrophysics Colloquium), Ed by J.-M. Vreux et al. (Liège, 1996), p. 155.
G. Koeningsberger, Astron. Astrophys. 235, 282 (1990).
A. F. J. Moffat, in Wolf-Rayet Stars in the Framework of Stellar Evolution (33rd Liège International Astrophysics Colloquium), Ed. by J.-M. Vreux et al., (Liège, 1996), p. 199.
S. Lepine and A. F. J. Moffat, Astrophys. J. 514, 909 (1999).
A. M. Cherepashchuk, in Thermal and Ionization Aspects of Flows from Hot Stars: Observations and Theory, Ed. by H. J. G. L. M. Lamers and A. Sapar, Astron. Soc. Pac. Conf. Ser. (2000) (in press).
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Translated from Astronomicheski\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\) Zhurnal, Vol. 78, No. 5, 2001, pp. 432–443.
Original Russian Text Copyright © 2001 by Antokhin, Cherepashchuk.
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Antokhin, I.I., Cherepashchuk, A.M. Interpretation of the light curve of the eclipsing binary V444 Cyg on the set of convexo-concave functions. Astron. Rep. 45, 371–381 (2001). https://doi.org/10.1134/1.1369800
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DOI: https://doi.org/10.1134/1.1369800