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H II REGION [1 record]

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Record 1 1999-02-12

English

Subject field(s)
  • Astrochemistry and Cosmochemistry
  • Astronomy
CONT

Since hydrogen is the main constituent of the gas, we often characterize a region of interstellar space according to whether its hydrogen is neutral-an "H I region" - or ionized-an "H II region". The gas in the H II regions glows by the process of fluorescence. The light emitted from these regions of ionized gas consists largely of emission lines, so they are also called "emission nebulae".

French

Domaine(s)
  • Astrochimie et cosmochimie
  • Astronomie
CONT

La partie restante relativement petite du milieu diffus entoure les étoiles chaudes qui l'ionisent par leur rayonnement. On y rapporte les nébuleuses diffuses, les champs d'hydrogène, les radiosources métriques. A la différence des premières, ces zones s'appellent régions H II.

Spanish

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