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H II REGION [2 records]
Record 1 - internal organization data 1999-02-12
Record 1, English
Record 1, Subject field(s)
- Astrochemistry and Cosmochemistry
- Astronomy
Record 1, Main entry term, English
- H II region
1, record 1, English, H%20II%20region
correct
Record 1, Abbreviations, English
Record 1, Synonyms, English
Record 1, Textual support, English
Record number: 1, Textual support number: 1 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". 1, record 1, English, - H%20II%20region
Record 1, French
Record 1, Domaine(s)
- Astrochimie et cosmochimie
- Astronomie
Record 1, Main entry term, French
- région H II
1, record 1, French, r%C3%A9gion%20H%20II
correct, feminine noun
Record 1, Abbreviations, French
Record 1, Synonyms, French
Record 1, Textual support, French
Record number: 1, Textual support number: 1 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. 1, record 1, French, - r%C3%A9gion%20H%20II
Record 1, Spanish
Record 1, Textual support, Spanish
Record 2 - internal organization data 1977-09-23
Record 2, English
Record 2, Subject field(s)
- Astrochemistry and Cosmochemistry
- Astronomy
Record 2, Main entry term, English
- H I region
1, record 2, English, H%20I%20region
correct
Record 2, Abbreviations, English
Record 2, Synonyms, English
Record 2, Textual support, English
Record number: 2, Textual support number: 1 OBS
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 regions"(...). The cold gases in HI regions are invisible on direct photographs, but they can be observed by their radio emission(...). Also, some of the gases in H I regions produce absorption lines on stellar spectra(...) 1, record 2, English, - H%20I%20region
Record 2, French
Record 2, Domaine(s)
- Astrochimie et cosmochimie
- Astronomie
Record 2, Main entry term, French
- région H I 1, record 2, French, r%C3%A9gion%20H%20I
Record 2, Abbreviations, French
Record 2, Synonyms, French
Record 2, Textual support, French
Record number: 2, Textual support number: 1 OBS
Dans toutes ces régions, l'hydrogène, l'élément le plus abondant, est à l'état neutre, c'est-à-dire à l'état H I. C'est pourquoi les zones appropriées sont dites régions H I (...). Les régions H I sont les zones les plus froides du milieu interstellaire. 1, record 2, French, - r%C3%A9gion%20H%20I
Record 2, Spanish
Record 2, Textual support, Spanish
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