Concept information
Terme préférentiel
R association
Définition(s)
- An R association is a group of young stars, typically less than a million years old, of intermediate mass, embedded in a reflection nebula. The nebula is illuminated by the stars, which unlike OB stars are not luminous enough to drive the material of the nebula away. R associations are one of three recognized types of stellar association. The R classification was first suggested by the the Canadian astronomer Sidney van den Bergh (1929–). Being relatively common, R associations are useful markers of the structure of our galaxy's spiral arms. An example is Vela R2, a very young group at a distance of about 2,800 light-years (850 pc). Encyclopedia of Science, by David Darling, https://www.daviddarling.info/encyclopedia/R/R_association.html)
Concept(s) générique(s)
Synonyme(s)
- R stellar association
Traductions
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français
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association stellaire R
URI
http://data.loterre.fr/ark:/67375/MDL-MK1VV251-H
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