Hostname: page-component-76fb5796d-qxdb6 Total loading time: 0 Render date: 2024-04-25T17:11:31.898Z Has data issue: false hasContentIssue false
  • English
  • Français

L’astronomie Infrarouge et les Poussieres Galactiques.

Published online by Cambridge University Press:  30 March 2016

Jean-Claude Pecker
Jean-Claude Pecker*
Affiliation:
Collège de France

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

The existence, in the Galaxy, of small absorbing dust grains has been known for a long time, as they redden the light of stars located behind them, and obscure by amounts which can often even be several magnitudes… In the infrared, where absorption is smaller, one can see through the dust, while at the same time, one can observe the emission of cold dust clouds. After a brief review of technical developments, the reasons for studying the infrared, and the principles of diagnostics, are given. The analysis of the spectral features leads to identification of ice, graphite, and various silicates, as main constituents of the dust. In the fifth section, examples are given of the various sources that one meets when travelling in the Galaxy: protostars, cold and dilute, dense envelopes of young stars (cold or hot), dilute envelopes of not so young stars, and ejected clouds surrounding evolved objects… The simultaneous observation of dust, molecules and atoms, in the same regions, shows that the knowledge of the circumstellar dense regions might be of a great interest, in the study of the origin of life, and of the evolution of the Universe.

Type
Invited Discourses
Information
Highlights of Astronomy , Volume 4 , Issue 1: Highlights of Astronomy. As presented at the XVIth General Assembly of the IAU, 1976 (Part I) , 1977 , pp. 2 - 33
Copyright
Copyright © Reidel 1977

References

INDICATIONS BIBLIOGRAPHIQUES

Neugebauer, G., Becklin, E., Hyland, A.R.: 1971, Infrared sources of radiation, Ann. Rev. Astron. Astrophys. 9, 67. Google Scholar
Pecker, J.-C., 1972, Données de l'observation et de la théorie et prévisions concernant les spectres (IR et ondes ultracourtes) des étoiles normales et particulières de type peu avancé, Mém. Soc. R. Sci. Liège, tème série, 3, 243. Google Scholar
Pecker, J.-C.: 1976, The O-complex: the O stars and their gas-dust circumstellar medium, Mém. Soc. R. Sci. Liége, 6ème série, 9, 319.Google Scholar
Stein, W.A.: 1975, Recent revelations of infrared astronomy, Publ. astron. Soc. Pacific, 87, 5. CrossRefGoogle Scholar
Wynn-Williams, C.G., Becklin, E.E.: 1974, Infrared emission from HII regions, Publ. astron. Soc. Pacific, 86, 5. CrossRefGoogle Scholar