Advertisement

A Review of Recent Observations of Dust in H II Regions

  • Lindsey F. Smith
Conference paper
Part of the Astrophysics and Space Science Library book series (ASSL, volume 55)

Abstract

The upper limit for the absorption cross section σ H ext , of dust in H II regions in the wavelength range 912−504 Å derived by Mezger et al. (1974), is compatible with that expected for large dust grains, and a gas-to-dust ratio equal to that in the general interstellar medium. The albedo of the small grains must be high for λ > 504 Å. This restriction is lifted if the visual extinction cross section of the grains in H II regions is less than that for grains in the general interstellar medium. New observations of the Orion Nebula indicate that the visual extinction cross section is within a factor 2 of the value in the general interstellar medium.

Keywords

Total Cross Section Absorption Cross Section Column Density Radio Observation Extinction Cross Section 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Auer, L. H. and Mihalas, D.: 1972, Astrophys. J. Suppl. 24, 193.CrossRefADSGoogle Scholar
  2. Bless, R. C. and Savage, B. D.: 1972, Astrophys. J. 171, 293.CrossRefADSGoogle Scholar
  3. Churchwell, E., Mezger, P. G., and Huchtmeier, W.: 1974, Astron. Astrophys. 32, 283.ADSGoogle Scholar
  4. Elsässer, H.: 1969, in L. V. Mavridis (ed.), Structure and Evolution of the Galaxy, D. Reidel, Holland, p. 70.Google Scholar
  5. Greenberg, J. M.: 1973, in J. M. Greenberg and H. C. vn de Hülst (eds.), ‘Interstellar Dust and Related Topics’, IAU Symp. 52, 3.ADSGoogle Scholar
  6. Greenberg, J. M.: 1974, Astrophys. J. 189, L81.CrossRefADSGoogle Scholar
  7. Harper, D. A. and Low, F. J.: 1971, Astrophys. J. 165, L9.CrossRefADSGoogle Scholar
  8. Jenkins, E. B. and Savage, B. D.: 1974, Astrophys. J. 187, 243.CrossRefADSGoogle Scholar
  9. Johnson, H. L.: 1967, Astrophys. J. 150, L39.CrossRefADSGoogle Scholar
  10. Johnson, H. L.: 1968, Stars and Stellar Systems 7, 167.Google Scholar
  11. Jura, M. and Wright, E. L.: 1974, Astrophys. J. 187, 473.CrossRefADSGoogle Scholar
  12. Leibowitz, E. M.: 1973, Astrophys. J. 181, 369.CrossRefADSGoogle Scholar
  13. Mathis, J. S.: 1973, Astrophys. J. 186, 815.CrossRefADSGoogle Scholar
  14. Mattila, K.: 1970, Astron. Astrophys. 9, 53.ADSGoogle Scholar
  15. Menon, T. K.: 1961, Publ. N.R.A.O. 1, 1.Google Scholar
  16. Mezger, P. G., Smith, L. F., and Churchwell, E.: 1974, Astron. Astrophys. 32, 269.ADSGoogle Scholar
  17. Münch, G. and Persson, S. E.: 1971, Astrophys. J. 165, 241.CrossRefADSGoogle Scholar
  18. Pauls, T., Mezger, P. G., and Churchwell, E.: 1974, Astron. Astrophys. 34, 327.ADSGoogle Scholar
  19. Salpeter, E. E.: 1955, Astrophys. J. 121, 161.CrossRefADSGoogle Scholar
  20. Savage, B. D.: 1973, in J. M. Greenberg and H. C. van de Hulst (eds.), ‘Interstellar Dust and Related Topics’, IAU Symp. 52, 21.ADSGoogle Scholar
  21. Savage, B. D. and Jenkins, E. B.: 1972, Astrophys. J. 172, 491.CrossRefADSGoogle Scholar
  22. Schraml, J. and Mezger, P. G.: 1969, Astrophys. J. 156, 269.CrossRefADSGoogle Scholar
  23. Soifer, B. T., Pipher, J. L., and Houck, J. R.: 1972, Astrophys. J. 177, 315.CrossRefADSGoogle Scholar
  24. van de Hulst, H. C. and de Jong, T.: 1969, Physica 41, 151.CrossRefADSGoogle Scholar
  25. Witt, A. N.: 1973, in J. M. Greenberg and H. C. van de Hulst (eds.), ‘Interstellar Dust and Related Topics’, IAU Symp. 52, 53.ADSGoogle Scholar
  26. Witt, A. N. and Lillie, C. F.: 1973, Astron. Astrophys. 25, 397.ADSGoogle Scholar
  27. Wright, E. L.: 1973, Astrophys. J. 185, 569.CrossRefADSGoogle Scholar
  28. York, D. G., Drake, J. F., Jenkins, E. B., Morton, D. C., Rogerson, J. B., and Spitzer, L.: 1973, Astrophys. J. 182, L1.CrossRefADSGoogle Scholar

Copyright information

© D. Reidel Publishing Company, Dordrecht, Holland 1976

Authors and Affiliations

  • Lindsey F. Smith
    • 1
  1. 1.Max-Planck-Institut für RadioastronomieBonnGermany

Personalised recommendations