Astrophysics and Space Science

, Volume 153, Issue 1, pp 61–66 | Cite as

Line profile variations in Be stars

  • Krishna M. V. Apparao
  • S. P. Tarafdar
Article

Abstract

Be stars show both emission and absorption profiles in the optical part of the spectrum, and these are found to vary with the time. Some of the shifts in profiles were earlier interpreted as Doppler shifts. However, some of the shifts of features in both emission and absorption line profiles may be artifacts due to superposition of an emission profile arising from an Hii region around a binary compact object, and a profile due to the Be star. This interpretation of shifts in line profiles has the advantage over the conventional Doppler-shift interpretation in so far as it does not need the oscillation of a large mass of circumstellar gas, and leads to the observed correlation between radial velocity (RV) variations and V/R variations.

Keywords

Absorption Profile Radial Velocity Absorption Line Large Mass Doppler Shift 

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References

  1. Apparao, K. M. V. and Tarafdar, S.: 1986,Astron. Astrophys. 161, 271.Google Scholar
  2. Ballereau, D. and Chauville, J.: 1987,Astron. Astrophys. Suppl. 70, 229.Google Scholar
  3. Ballereau, D. and Hubert-Delplace, A. M.: 1982, ‘Be Stars’, in M. Jaschek and H. G. Groth (eds.),IAU Symp. 98, 171.Google Scholar
  4. Delplace, A. M. and Chambon, M. Th.: 1976, ‘Be and Shell Stars’, in A. Slettebak (ed.),IAU Symp. 70, 79.Google Scholar
  5. Doazan, V.: 1982, in A. Underhill and B. Doazan (eds.),B Stars with and without Emission Lines, NASA SP-456.Google Scholar
  6. Hubert-Delplace et al.: 1982, ‘Be Stars’ in M. Jaschek and H. G. Groth (eds.),IAU Symp. 98, 125.Google Scholar
  7. Hubert, A. M., Floquet, M. and Chambon, M. T.: 1987,Astron. Astrophys. 186, 213.Google Scholar
  8. Pastori et al.: 1982, ‘Be Stars’, in M. Jaschek and H. G. Groth (eds.),IAU Symp. 98, 155.Google Scholar

Copyright information

© Kluwer Academic Publishers 1989

Authors and Affiliations

  • Krishna M. V. Apparao
    • 1
  • S. P. Tarafdar
    • 1
  1. 1.Tata Institute of Fundamental ResearchBombayIndia

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