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Far ultra-violet radiation : stars, nebulae and interstellar matter

Published online by Cambridge University Press:  14 August 2015

M. J. Seaton
M. J. Seaton*
Affiliation:
University College, London, United Kingdom

Abstract

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The ultra-violet flux radiated by hot stars is found to be smaller than the value deduced from theory. The possible origins of this discrepancy are discussed : interstellar absorption, deviation from local thermodynamic equilibrium, molecular absorption, blanketting effect. Observations of planetary nebulae provide data about UV radiation from very hot stars.

Le flux ultraviolet observé dans les étoiles chaudes est inférieur au flux calculé. Les causes possibles de cette différence sont discutées : absorption interstellaire, écarts à l'ETL, absorption moléculaire, absorption atomique, effet de blanhetting. UObservation des nébuleuses planétaires permet d'étudier le rayonnement U. V. des étoiles tres chaudes.

Резюме

Резюме

Наблюдаемый ультрафиолетовый поток горячих звезд меньше вычисленного потока. Обсуждены возможецые причины этой разницы : межзвездное поглощение, отклонения в локальном термодинамическом равновесии, молеклярное поглощение, атомное поглощение эффект blankett'.ng. Наблюдение планетарных туманностей позволяет изучать излучение UV горячих звезд.

Type
Session IV. Far Ultra-Violet Radiation : Stars and Galaxies
Information
Symposium - International Astronomical Union , Volume 23: Astronomical Observations from Space Vehicles , 1965 , pp. 133 - 139
Copyright
Copyright © CNRS 1965 

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