Skip to main content
SpringerLink
Log in

Morphology and variability of helium line profiles in the P Cygni spectrum

A Comparison With Lines From Other Ions

  • Published:
Astrophysics and Space Science Aims and scope Submit manuscript

Abstract

The morphology and variability of 13 helium lines in the P Cygni optical spectrum have been studied in detail over a period of three years. It is found that most lines in the sample have often shown profiles with a complicated structure: discrete components are superposed on a broader “underlying” P Cyg profile. Multiple sets of components were frequently observed. The radial velocity of the discrete components varies with time. In this article the velocity evolution of two sets of components is studied in detail and the corresponding velocity laws are derived. It is found that the velocity variations in the helium and hydrogen discrete components are correlated. The recurrence timescale for the appearance of new helium components is estimated.

An attempt is made for a qualitative interpretation of the obtained results.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

References

  • Cassatella, A. et al.: 1979,Astron. Astroph. 79, 223.

    Google Scholar 

  • De Groot, M.: 1969,Bull. Astron. Inst. Neth. 20, 225.

    Google Scholar 

  • De Groot, M.: 1989,Armagh Obs., preprint No. 96.

  • Kolka, I. and Markova, N.: 1987,Publ. Tartu Astroph. Obs. 52, 289.

    Google Scholar 

  • Lamers, H., Korevaar, P. and Cassatella, A.: 1985,Astro. Astroph. 149, 29.

    Google Scholar 

  • Luud, L. Golandski, O. and Iarigina, T.: 1975,Publ. Tartu Astroph. Obs. 53, 250.

    Google Scholar 

  • Markova, N.: 1986a,Astroph. Space Science 123, 5.

    Google Scholar 

  • Markova, N.: 1986b,Astron. Astroph. 162, L3.

    Google Scholar 

  • Markova, N.: 1989,Astroph. Space Science 158, 89.

    Google Scholar 

  • Markova, N.: 1990,Monthly Notices of the RAS 244, 105.

    Google Scholar 

  • Markova, N. and Kolka, I.: 1984,Astrofizika 20, 465.

    Google Scholar 

  • Markova, N. and Kolka, I.: 1988,Astroph. Space Science 141, 45.

    Google Scholar 

  • Stahl, O., Kneer, R., Mandel, H., Stumpf, N., Szeifert, T., Wolf, B. and Zhao, F.: 1991,Astron. Ges., Abstr. Ser. 6, 71.

    Google Scholar 

  • Waters, L. and Wesselius, P.R: 1986,Astroph. J. 155, 104.

    Google Scholar 

  • Underhill, A.: 1966,The Early Type Stars, D. Reidel Publishing Comp., Dordrecht.

    Google Scholar 

  • Van Genderen, A.M.: 1990, in: K.A. van der Hucht and B. Hidayat (eds.)Wolf-Rayet Stars and Interrelations with Other Massive Stars in Galaxies, IAU Symp.143.

  • Van Gent, R. H. and Lamers H.J.: 1985,Astron. Astroph. 158, 395.

    Google Scholar 

Download references

Author information

Authors and Affiliations

  1. National Astronomical Observatory, Smolian, Bulgaria

    N. Markova

Authors
  1. N. Markova
    View author publications

    You can also search for this author in PubMed Google Scholar

Rights and permissions

Reprints and permissions

About this article

Cite this article

Markova, N. Morphology and variability of helium line profiles in the P Cygni spectrum. Astrophys Space Sci 201, 61–70 (1993). https://doi.org/10.1007/BF00626974

Download citation

  • Received:

  • Issue Date:

  • DOI: https://doi.org/10.1007/BF00626974

Keywords

Search

Navigation