Astrophysics and Space Science

, Volume 34, Issue 1, pp 81–89 | Cite as

Thermal emission spectra of silicates from planetary nebulae

  • E. Bussoletti
  • J. P. Baluteau
  • N. Epchtein
Article
  • 25 Downloads

Abstract

Calculations of the grain equilibrium temperature and of the expected infrared spectra of IC 418, BD+30° 3639, NGC 6572 and NGC 7027 have been performed using dielectric constants of lunar silicates. The results have been compared with previous work on pure graphite and ice-mantle grains. Lα heating of dust followed by thermal re-emission is consistent with the large infrared excesses detected in planetary nebulae. An extra source of heating is, nevertheless, necessary to fit correctly the experimental results. It appears from the calculations that, for each object, it is possible to define theoretically the most probable nature of the emitting dust.

Keywords

Dust Graphite Silicate Dielectric Constant Emission Spectrum 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Becklin, E. E., Neugebauer, G., and Wynn-Williams, C. C.: 1973,Astrophys. Letters 15, 87.Google Scholar
  2. Bussoletti, E., Epchtein, N., and Baluteau, J. P.: 1974,Astron. Astrophys. 34, 141.Google Scholar
  3. Cohen, M. and Barlow, M. J.: 1975,Astrophys. J., in press.Google Scholar
  4. Gillett, F. C., Merrill, K. M., and Stein, W. A.: 1972,Astrophys. J. 172, 367.Google Scholar
  5. Knacke, R. F. and Thompson, R. K.: 1973,Publ. Astron. Soc. Pacific 85, 341.Google Scholar
  6. Knacke, R. F. and Dressler, A. M.: 1973,Publ. Astron. Soc. Pacific 85, 100.Google Scholar
  7. Krishna Swamy, K. S. and O'Dell, C. R.: 1968,Astrophys. J. 151, L61.Google Scholar
  8. Neugebauer, G. and Garmire, G.: 1970,Astrophys. J. 161, L91.Google Scholar
  9. Perry, C. H., Agrawal, D. K., Anastassakis, E., Lowndes, R. P., Rastogi, A., and Tornberg, N. E.: 1972,The Moon 4, 315.Google Scholar
  10. Terzian, Y. Y. and Sanders, D.: 1972,Astron. J. 77, 350.Google Scholar
  11. Van de Hulst, H. C.: 1957,Light Scattering by Small Particles, Chapman and Hall, London.Google Scholar
  12. Werner, M. W. and Salpeter, E. E.: 1969,Monthly Notices Roy. Astron. Soc. 145, 249.Google Scholar
  13. Wickramasinghe, N. C.: 1967,Interstellar Grains, Chapman and Hall, London.Google Scholar
  14. Willner, S. P., Beclin, E. E., and Visvananthan, N.: 1972,Astrophys. J. 175, 699.Google Scholar

Copyright information

© D. Reidel Publishing Company 1975

Authors and Affiliations

  • E. Bussoletti
    • 1
  • J. P. Baluteau
    • 2
  • N. Epchtein
    • 2
  1. 1.Istituto di FisicaUniversità degli StudiLecceItaly
  2. 2.Observatoire de MeudonFrance

Personalised recommendations