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Spectrophotometric studies of CQ Cephei

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Abstract

Spectrophotometric and spectroscopic observations of CQ Cep — the shortest-period binary with WN component — are presented. Excepting the NV λ4603, the fluxes of all other emission lines show enhancement at minima. They can be explained by the Roche surfaces that take into account the strong wind of the WN7 component. Various radial velocity curves for emission and absorption give different orbital solutions with a general positive shift of λ axes. Although N IV λ4058 represents the true motion of the WN7 component, its flux variations are influenced by geometric effects. There is no signature of the companion. The extent of the atmosphere of CQ Cephei appears larger than in V444Cyg, another eclipsing binary with a Wolf-Rayet component.

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References

  • Bappu, M. K. V. 1951a,PhD Thesis, Harvard Univ.

  • Bappu, M. K. V. 1951b,Astr. J.,56, 120.

    Article  ADS  Google Scholar 

  • Bappu, M. K. V. 1952,Astr. J.,57, 6.

    Article  ADS  Google Scholar 

  • Bappu, M. K. V., Sinvhal, S. D. 1955,Astr. J.,60, 152.

    Article  ADS  Google Scholar 

  • Bappu, M. K. V., Sinvhal, S. D. 1959,Observatory,79, 140.

    ADS  Google Scholar 

  • Bappu, M. K. V. 1973, inIAU Symp. 49:Wolf-Rayet and High-Temperature Stars, Eds M. K. V. Bappu & J. Sahade, D. Reidel, Dordrecht, p. 59.

    Google Scholar 

  • Bappu, M. K. V. 1977,K.odaikanal Obs. Bull. Ser. A,2, 64.

    ADS  Google Scholar 

  • Bappu, M. K. V., Viswanadham, P. 1977,K.odaikanal Obs. Bull. Ser. A,2, 89.

    ADS  Google Scholar 

  • Breger, M. 1976,Astrophys. J. Suppl. Ser.,32, 1.

    Article  ADS  Google Scholar 

  • Cherepashchuk, A. M., Khaliullin, K. H. F. 1976,Soviet Astr.,19, 727.

    ADS  Google Scholar 

  • Ganesh, K. S., Bappu, M. K. V., Natarajan, V. 1967,K.odaikanal Obs. Bull. Ser. A, No. 184, 93.

  • Giridhar, S. 1978,K.odaikanal Obs. Bull. Ser. A,2, 164.

    ADS  Google Scholar 

  • Hack, M., Struve, O. 1970, inStellar Spectroscopy: Peculiar Stars, Osser. Astr. Trieste, p. 129.

  • Hackwell, J. A., Gehrz, R. D., Smith, J. R. 1974,Astrophys. J.,192, 383.

    Article  ADS  Google Scholar 

  • Hayes, D. S. 1970,Astrophys. J.,159, 165.

    Article  ADS  Google Scholar 

  • Hiltner, W. A. 1950,Astrophys. J.,112, 477.

    Article  ADS  Google Scholar 

  • Hua, C. T., Woo, J. O., Nguyen, H. D. 1982,Astr. Astrophys. Suppl. Ser.,53, 407.

    ADS  Google Scholar 

  • Kartasheva, T. A. 1976,Soviet Astr. Lett.,2, 197.

    ADS  Google Scholar 

  • Khaliullin, K.h. F. 1973,Soviet Astr.,16, 636.

    ADS  Google Scholar 

  • Kuhi, L. V. 1966,Astrophys. J.,143, 753.

    Article  ADS  Google Scholar 

  • Kuhi, L. V. 1968,Astrophys. J.,152, 89.

    Article  ADS  Google Scholar 

  • Leung, K. C., Moffat, A. F. J., Seggewiss, W. 1983,Astrophys. J.,265, 961.

    Article  ADS  Google Scholar 

  • Massey, P. 1981,Astrophys. J.,244, 157.

    Article  ADS  Google Scholar 

  • Massey, P., Conti, P. S. 1981,Astrophys. J.,244, 169.

    Article  ADS  Google Scholar 

  • Moffat, A. F. J., Seggewiss, W. 1977,Astr. Astrophys.,54, 607.

    ADS  Google Scholar 

  • Moffat, A. F. J., Seggewiss, W. 1980, inIAU Symp. 83:Mass-loss and Evolution of O type stars, Eds P. S. Conti & C. W. H. de Loore, D. Reidel, Dordrecht, p. 447.

    Google Scholar 

  • Niemela, V. S. 1980, in IAU Symp. 88:Close Binary Stars: Observations and Interpretations, Eds M. J. Plavec, D. M. Popper & R. K. Ulrich, D. Reidel, Dordrecht, p. 177.

    Google Scholar 

  • Plavec, M., Kratochvil, P. 1964,Bull. astr. Inst. Csl.,15, 165.

    ADS  Google Scholar 

  • Sahade, J., Wood, F. B. 1978, inInteracting Binary Stars, Pergamon Press, p. 101.

  • Schuerman, D. W. 1972,Astrophys. Space Sci.,19, 351.

    Article  ADS  Google Scholar 

  • Semeniuk, I. 1968,Acta.Astr.,18, 313.

    ADS  Google Scholar 

  • Smith, L. F. 1973, inIAU Symp. 49:Wolf-Rayet and High-Temperature Stars, Eds M. K. V. Bappu & J. Sahade, D. Reidel, Dordrecht, p. 15.

    Google Scholar 

  • Stickland, D. J., Bromage, G. E., Budding, E., Burton, W. M., Howrath, I. D., Jameson, R., Scherrington, M. R., Willis, A. J. 1984,Astr. Astrophys.,134, 45.

    ADS  Google Scholar 

  • Underhill, A. B., 1969, inMass-loss from Stars, Ed. M. Hack, D. Reidel, Dordrecht, p. 17.

    Google Scholar 

  • Vanbeveren, D. 1977,Astr.Astrophys.,54, 877.

    ADS  Google Scholar 

  • vander Hucht, K. A., Conti, P. S., Lundström, I., Stenholm, B. 1981,Space Sci. Rev.,28, 227.

    ADS  Google Scholar 

  • Walker, E. N., Lloyd, C., Pike, C. D., Stickland, D. J., Zuiderwijk, E. J. 1983,Astr. Astrophys.,128, 394.

    ADS  Google Scholar 

  • Zorec, J., Niemela, V. 1980a,C. R. Acad. Sci. Paris,290, Ser. B, 67.

    Google Scholar 

  • Zorec, J., Niemela, V. S. 1980b,C. R. Acad. Sci. Paris,290,Ser. B, 95.

    Google Scholar 

Download references

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  1. Indian Institute of Astrophysics, 560034, Bangalore

    B. S. Shylaja

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  1. B. S. Shylaja
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Shylaja, B.S. Spectrophotometric studies of CQ Cephei. J Astrophys Astron 7, 171–194 (1986). https://doi.org/10.1007/BF02714209

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