Skip to main content
SpringerLink
Log in

On the spectrum of a gaseous nebula of pure hydrogen

III: The Balmer decrement

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

Abstract

The Balmer decrement was calculated for a homogeneous, spherical, pure hydrogen nebula, ionised and excited both by radiative and collisional processes. Reabsorption in the Balmer series from sublevels 2s and 2p was taken into account. Calculations were carried out for electron temperatures of 104 K and 2×104 K, electron densities from 103 to 106 cm−3, and radii from 1015 to 1017 cm. The results define allowed and forbidden regions in the log(Hβ/Hγ) vs log(Hα/Hβ) diagram different from those of previous results obtained assuming purely radiative or purely collisional ionisation and excitation. A brief comparison with observations is presented and discussed.

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

  • Auer, L. H.: 1968,Astrophys. J. 153, 783.

    Google Scholar 

  • Avery, L. W., and House, L. L.: 1968,Astrophys. J. 152, 493.

    Google Scholar 

  • Burgess, A.: 1965,Mem. Roy. Astron. Soc. 69, 1.

    Google Scholar 

  • Capriotti, E.: 1964,Astrophys. J. 139, 225.

    Google Scholar 

  • Caputo, F., Gerola, H., and Panagia, N.: 1970,Astrophys. Letters 5, 275.

    Google Scholar 

  • Cox, D. P. and Matthews, W. G.: 1969,Astrophys. J. 155, 859.

    Google Scholar 

  • Flower, D. R.: 1969,Monthly Notices Roy. Astron. Soc. 146, 243

    Google Scholar 

  • Gerola, H. and Panagia, N.: 1968,Astrophys. Space Sci. 2, 285.

    Google Scholar 

  • Gerola, H. and Panagia, N.: 1970,Astrophys. Space Sci. 8, 120.

    Google Scholar 

  • Karzas, W. I. and Latter, R.: 1961,Astrophys. J. Suppl. Ser. 6, 167.

    Google Scholar 

  • Kuhi, L. Y.: 1968, inInterstellar Ionized Hydrogen (ed by Y. Terzian), W. A. Benjamin, New York.

    Google Scholar 

  • Mihalas, D.: 1967,Astrophys. J. 149, 169.

    Google Scholar 

  • O'Dell, C. R.: 1963,Astrophys. J. 138, 1018.

    Google Scholar 

  • O'Dell, C. R.: 1966,Astrophys. J. 145, 487.

    Google Scholar 

  • O'Dell, C. R.: 1967,Astrophys. J. 149, 373.

    Google Scholar 

  • Osterbrock, D. E.: 1962,Astrophys. J. 135, 195.

    Google Scholar 

  • Parker, R. A. R.: 1964,Astrophys. J. 139, 208.

    Google Scholar 

  • Seaton, M. J.: 1960, inReports on Progress in Physics,23, 317.

  • Wampler, E. J.: 1968,Astrophys. J. 153, 19.

    Google Scholar 

Download references

Author information

Authors and Affiliations

  1. Departmento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentine

    H. Gerola & M. Salem

  2. Laboratorio di Astrofisica, Frascati, Italy

    N. Panagia

Authors
  1. H. Gerola
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. M. Salem
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. N. Panagia
    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

Gerola, H., Salem, M. & Panagia, N. On the spectrum of a gaseous nebula of pure hydrogen. Astrophys Space Sci 10, 383–392 (1971). https://doi.org/10.1007/BF00649682

Download citation

  • Received:

  • Issue Date:

  • DOI: https://doi.org/10.1007/BF00649682

Keywords

Search

Navigation