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Photometry and spectroscopy of the system V4641 sagittarii in quiescence

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Abstract

We present the results of our CCD photometric and moderate-dispersion spectroscopic observations of the binary system V4641 Sgr, which contains a black hole of mass ≈9.5M ⊙ and a normal B9III star. The photometric light curve reveals an ellipticity effect with very high amplitudes in V and R, 0.40m and 0.37m, and the color curve shows that the surface temperature is nonuniform. All this testifies to tidal distortion of the normal star's surface due to the massive companion and to a high inclination of the orbit to the line of sight. In June and July 2002, during quiescence, we obtained data during three flares with amplitudes up to 0.26m. In particular, spectroscopic observations were acquired near the time of the black hole's inferior conjunction. One hour before conjunction, a depression by EW=0.5 Å was observed in the red wing of the Hα absorption line, interpreted as absorption by gas flowing in the direction from the observer toward the normal star. This flow is apparently associated with a rarefied gas disk around the black hole, and the conjunction grazes the stellar surface if the orbital inclination is close to 70.7°. The maximum velocity along a circular Keplerian orbit is 650 km/s at a distance of R=0.15–0.20a from the black hole (where a is the component separation). Thus, we find the mass of the black hole to be M BH =7.1–9.5M ⊙, confirming the model of Orosz et al. (2001).

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References

  1. V. P. Goranskij, Astron. Tsirk., No. 1024, 3 (1978).

  2. V. P. Goranskij, Inform. Bull. Var. Stars, No. 3464 (1990).

  3. M. L. Hazen, D. Hoffleit, B. L. Welther, and D. B. Williams, AAVSO J. 28, 99 (2000).

    ADS  Google Scholar 

  4. J. Orosz, Inform. Bull. Var. Stars, No. 4921 (2000).

  5. J. in't Zand, J. Heize, A. Bazzano, et al., IAU Circ. No. 7119 (1999).

  6. C. B. Markwardt, J. H. Swank, and F. E. Marshall, IAU Circ. No. 7120 (1999).

  7. T. Kato, M. Uemura, R. Stubbings, et al., Inform. Bull. Var. Stars, No. 4777 (1999).

  8. M. Uemura, T. Kato, T. Watanabe, et al., Publ. Astron. Soc. Jpn. 54, 95 (2002).

    ADS  Google Scholar 

  9. R. Stubbings, IAU Circ. No. 7253 (1999).

  10. K. Ayani, T. C. Peiris, and A. C. Clarke, IAU Circ. No. 7254 (1999).

  11. S. G. Djorgovski, R. R. Gal, A. Mahabal, et al., ATEL No. 44 (1999).

  12. P. A. Charles, T. Shahbaz, and T. Geballe, IAU Circ. No. 7267 (1999).

  13. S. Chaty, I. F. Mirabel, J. Marti, and L. F. Rodriguez, Astrophys. Space Sci. 276, 153 (2001), astro-ph/0102105.

    Article  Google Scholar 

  14. R. M. Hjellming, M. P. Rupen, R. W. Hunstead, et al., Astrophys. J. 544, 977 (2000).

    Article  ADS  Google Scholar 

  15. D. A. Smith, A. M. Levine, and E. H. Morgan, IAU Circ. No. 7253 (1999).

  16. R. Wijnands and M. van der Klis, Astrophys. J. 528, L93 (2000).

    Article  ADS  Google Scholar 

  17. J. J. M. in't Zand, E. Kuulkers, A. Bazzano, et al., Astron. Astrophys. 357, 520 (2000).

    ADS  Google Scholar 

  18. M. G. Revnivtsev and R. A. Syunyaev, Pis'ma Astron. Zh. 28, 83 (2002) [Astron. Lett. 28, 69 (2002)].

    Google Scholar 

  19. M. Revnivtsev, R. Sunyaev, M. Gilfanov, and E. Churazov, Astron. Astrophys. 385, 904 (2002).

    Article  ADS  Google Scholar 

  20. M. Revnivtsev, M. Gilfanov, E. Churazov, and R. Sunyaev, Astron. Astrophys. 391, 1013 (2002).

    Article  ADS  Google Scholar 

  21. M. Uemura, T. Kato, R. Ishioka, et al., Publ. Astron. Soc. Jpn. (in press, 2002); astro-ph/0208146.

  22. M. Rupen, V. Dhavan, and A. Mioduszewski, IAU Circ. No. 7928 (2002).

  23. D. Campbell-Wilson and R. W. Hunstead, IAU Circ. No. 7908 (2002).

  24. C. B. Markwardt and J. H. Swank, IAU Circ. No. 7906 (2002).

  25. J. A. Tomsick, M. P. Rupen, S. Corbel, et al., ATEL No. 105 (2002).

  26. R. M. Hjellming, ATEL No. 62 (2000).

  27. J. Orosz, E. Kuulkers, M. van der Klis, et al., Astrophys. J. 555, 489 (2001).

    Article  ADS  Google Scholar 

  28. V. P. Goranskij, E. A. Barsukova, A. H. Burenkov, and D. N. Monin, in New Views on Microquasars, Ed. by Ph. Durouchoux, V. Fuchs, and J. Rodrigues (Center for Space Physics, Kolkata, 2002, in press); astro-ph/0209592.

    Google Scholar 

  29. A. Henden, vsnet-campaign-v4641sgr. No. 133 (VSNET, 2002).

  30. V. P. Goranskij, Inform. Bull. Variable Stars, No. 5068 (2001).

  31. J. Marti, R. Zamanov, J. M. Paredes, and M. Ribo, Inform. Bull. Var. Stars, No. 5036 (2001).

  32. E. A. Karitskaya, Candidate's Dissertation in Mathematical Physics (Moscow, Sternberg Astron. Inst., 1982).

    Google Scholar 

  33. A. V. Goncharskij, S. Yu. Romanov, and A. M. Cherepachshuk, Astrophysic Finite-Parametric Inverse Problems (Mos. Gos. Univ., Moscow, 1991), p. 77.

    Google Scholar 

  34. E. A. Karitskaya, I. B. Voloshina, V. P. Goranskij, et al., Astron. Zh. 78, 408 (2001) [Astron. Rep. 45, 350 (2001)].

    Google Scholar 

  35. V. P. Goranskij and V. M. Lyuty, Astron. Zh. 65, 381 (1988) [Sov. Astron. 32, 193 (1988)].

    ADS  Google Scholar 

  36. M. Rupen, vsnet-campaign-v4641sgr No. 104 (VSNET, 2002).

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Authors and Affiliations

  1. Sternberg Astronomical Institute, Universitetskii pr. 13, Moscow, 119992, Russia

    V. P. Goranskij

  2. Special Astrophysical Observatory, Russian Academy of Sciences, Nizhnii Arkhyz, Karachai-Cherkessian Republic, 357147, Russia

    E. A. Barsukova & A. N. Burenkov

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  1. V. P. Goranskij
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  2. E. A. Barsukova
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  3. A. N. Burenkov
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__________

Translated from Astronomicheski\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) Zhurnal, Vol. 80, No. 9, 2003, pp. 805–815.

Original Russian Text Copyright © 2003 by Goranskij, Barsukova, Burenkov.

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Goranskij, V.P., Barsukova, E.A. & Burenkov, A.N. Photometry and spectroscopy of the system V4641 sagittarii in quiescence. Astron. Rep. 47, 740–749 (2003). https://doi.org/10.1134/1.1611215

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