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MIRA-TYPE VARIABLE [1 record]
Record 1 - internal organization data 1977-09-22
Record 1, English
Record 1, Subject field(s)
- Astronomy
Record 1, Main entry term, English
- Mira-type variable
1, record 1, English, Mira%2Dtype%20variable
correct
Record 1, Abbreviations, English
Record 1, Synonyms, English
- long-period variable 2, record 1, English, long%2Dperiod%20variable
correct
Record 1, Textual support, English
Record number: 1, Textual support number: 1 OBS
These are variable in cycles of from 3 months to more than 2 years, and most commonly around 10 months. Their periods and ranges in brightness have an approach to regularity which is remindful of the cycles of sunspot numbers. The range in their light variations averages 5 magnitudes (...) The spectra are mainly of type M, but S, R, and N are represented as well. They contain the dark lines and bands characteristic of red stars, and also bright lines, particularly of hydrogen, which have been the means of discovering many of these variable stars. 2, record 1, English, - Mira%2Dtype%20variable
Record 1, French
Record 1, Domaine(s)
- Astronomie
Record 1, Main entry term, French
- variable à longue période du type Mira Ceti 1, record 1, French, variable%20%C3%A0%20longue%20p%C3%A9riode%20du%20type%20Mira%20Ceti
Record 1, Abbreviations, French
Record 1, Synonyms, French
Record 1, Textual support, French
Record number: 1, Textual support number: 1 OBS
Au-dessous [des variables irrégulières] se trouvent les étoiles aux raies d'émission des classes spectrales Me, Re, Ne et Se qui changent elles aussi irrégulièrement mais progressivement leur éclat en de très grands intervalles de temps (70 à 1300 jours) et dans de très grandes limites (...). Une de leurs représentantes remarquables est o Baleine ou Mira Ceti (...) C'est pourquoi toute cette classe s'appelle "variables à longue période du type Mira Ceti". Les spectres de ces étoiles comportent toujours des raies d'émission de l'hydrogène (au maximum) ou des métaux (avant le minimum). Leur période varie autour de la moyenne de 10% dans les deux sens. 1, record 1, French, - variable%20%C3%A0%20longue%20p%C3%A9riode%20du%20type%20Mira%20Ceti
Record 1, Spanish
Record 1, Textual support, Spanish
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