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Journal of Astrophysics and Astronomy

, Volume 9, Issue 3, pp 161–172 | Cite as

Study of the Wolf-Rayet members of the cluster NGC 6231

  • B. S. Shylaja
Article

Abstract

Two Wolf-Rayet members of the cluster NGC 6231 are studied spectrophotometrically. HD 151932, a suspected variable, shows variations in the emission line flux as well as continuum magnitude measurements. An attempt is made to understand this variation as due to the asymmetric atmospheric structure. The other, HD 152270, a (WC7 + O) binary, shows variation of emission line flux for C III and C IV lines only. This variation is studied as a possible phenomenon of atmospheric eclipses.

Key words

stars, emission-line stars, Wolf-Rayet open clusters, NGC 6231 

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References

  1. Bappu, M. K. V. 1973, inIAU Symp. 49:Wolf-Rayet Stars and High Temperature Stars, Eds M. K. V. Bappu & J. Sahade, p. 59.Google Scholar
  2. Bappu, M. K. V. 1977,Kodaikanal Obs. Bull, Ser. A,2, 64ADSGoogle Scholar
  3. Braes, L. L. E. 1967,Bull. astr. Inst. Neth. Suppl.,2, 21.Google Scholar
  4. Breger, M. 1976,Astrophys. J. Suppl.,32, 1.CrossRefADSGoogle Scholar
  5. Brown, R. H., Davis, J., Herbison-Evans, D., Allen, L. R. 1970,Mon. Not. R. astr. Soc.,148, 103.ADSGoogle Scholar
  6. Crawford, D. L., Barnes, J. V., Hill G., Perry, C. L. 1971,Astr. J.,76, 1948.ADSGoogle Scholar
  7. Drissen, L., St. Louis, N., Moffat, A. F. J., Bastien, P. 1987,Astrophys. J.,322, 888.CrossRefADSGoogle Scholar
  8. Ganesh K. S. 1966,Ph.D. Thesis, Karnataka Univ.Google Scholar
  9. Ganesh, K. S., Bappu, M. K. V., Natarajan, V. 1967,Kodaikanal Obs. Bull Ser. A., No. 184.Google Scholar
  10. Garrison, R. F., Schild R. E. 1979,Astr. J.,84, 1020.CrossRefADSGoogle Scholar
  11. Graham, J. A. 1965,Observatory,85, 196ADSGoogle Scholar
  12. Hayes, D. S. 1970,Astrophys. J.,159, 165.CrossRefADSGoogle Scholar
  13. Heske, A., Wendker, H. J. 1984,Astr. Astrophys. Suppl.,57, 205.ADSGoogle Scholar
  14. Heske, A., Wendker, H. J. 1985,Astr. Astrophys.,151, 309.ADSGoogle Scholar
  15. Hill, P. W., Kilkenny, D., Van Breda, I. G. 1974,Mon. Not. R. astr. Soc.,168, 451.ADSGoogle Scholar
  16. Hiltner, W. 1944,Astrophys. J.,104, 396CrossRefADSGoogle Scholar
  17. Hiltner, W., Schild, R. E. 1966,Astrophys. J.,143, 770.CrossRefADSGoogle Scholar
  18. Kuan, P., Kuhi, L. V. 1976,Publ. astr. Soc. Pacific,88, 128.CrossRefADSGoogle Scholar
  19. Leung, K. C., Moffat, A. F. J., Seggewiss, W. 1983Astrophys. J.,265, 961.CrossRefADSGoogle Scholar
  20. Lundstrom, I., Stenholm, B. 1980,Rep. Lund Observatory, No. 16.Google Scholar
  21. Moffat, A. F. J., Seggewiss, W. 1977,Astr. Astrophys.,54, 607.ADSGoogle Scholar
  22. Moffat, A. F. J. Vogt, N., Paquin, G., Lamontagne, R., Barrera L. H. 1986,Astr. J.,91, 1386.CrossRefADSGoogle Scholar
  23. Neutsch, W., Schmidt, H., Seggewiss, W. 1981,Acta Astr.,31, 197.ADSGoogle Scholar
  24. Neutsch, W., Schmidt, H. 1985,Astrophys. Sp. Sci.,109, 249.CrossRefADSGoogle Scholar
  25. Plavec, M., Kratochvil, P. 1964Bull. astr. inst. Csl.,15, 165.ADSGoogle Scholar
  26. Raveendran, A. V., Mohin, S., Mekkadan, M. V. 1982,Mon. Not. R. astr. Soc.,199, 707.ADSGoogle Scholar
  27. Schild, R. E., Hiltner, W. A., Sanduleuk, N. 1969,Astrophys. J.,156, 609.CrossRefADSGoogle Scholar
  28. Schild, R. E., Neugebauer, G., Westphal, J. A. 1971,Astr. J.,76, 237.CrossRefADSGoogle Scholar
  29. Schmidt, H., Seggewiss, W. 1976, inMultiple Periodic Variables Stars, Ed. W. S. Fitch, Akademia Kiado, Budapest, p. 311.Google Scholar
  30. Schuerman, D. W. 1972,Astrophys. Sp. Sci.,19, 351.CrossRefADSGoogle Scholar
  31. Schumann, J. D., Seggewiss, W. 1975, inIAU Symp.67: Variable Stars and Stellar Evolution, Eds V. E. Sherwood & L. Plaut, D. Reidel, Dordrecht, p. 299.Google Scholar
  32. Seggewiss, W. 1974a,Publ. astr. Soc. Pacific,86, 670.CrossRefADSGoogle Scholar
  33. Seggewiss, W. 1974b,Astr. Astrophys.,31, 211.ADSGoogle Scholar
  34. Seggewiss, W., Moffat A. F. J. 1979,Astr. Astrophys.,72, 332.ADSGoogle Scholar
  35. Shylaja B. S. 1986,J. Astrophys. Astr.,7, 171.CrossRefADSGoogle Scholar
  36. Shylaja B. S. 1986b,J. Astrophys. Astr.,7, 305.CrossRefADSGoogle Scholar
  37. Shylaja, B. S., 1987,J. Astrophys. Astr.,8, 183.CrossRefADSGoogle Scholar
  38. Shylaja B. S., Bappu M. K. V., 1983,Kodaikanal Obs. Bull.,3, 72.Google Scholar
  39. Stickland, D. J. Bromage, G. E., Budding, E., Burton, W. M., Howrath, I. D., Jameson, R., Sherrington, M. R., Willis, A. J. 1984,Astr. Astrophys.,134, 45.ADSGoogle Scholar
  40. St Louis, N., Drissen, L., Moffat, A. F. J., Bastien, P., Tapia S. 1987,Astrophys. J.,322, 870.CrossRefADSGoogle Scholar
  41. Struve, O. 1944,Astrophys. J.,100, 189.CrossRefADSGoogle Scholar
  42. Vanbeveren, D. 1977,Astr. Astrophys.,54, 877ADSGoogle Scholar
  43. Vreux, J. M., Magain, P., Manfroid, J., Scuflaire, R. 1987,Astr. Astrophys.,180, LI7.Google Scholar

Copyright information

© Indian Academy of Sciences 1988

Authors and Affiliations

  • B. S. Shylaja
    • 1
  1. 1.Indian Institute of AstrophysicsBangalore

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