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Дата изменения: Thu Mar 16 18:26:18 2000 Дата индексирования: Tue Oct 2 03:07:42 2012 Кодировка: Поисковые слова: universe |
The distribution of galactic RCB stars is controversial. Several authors have argued that
they belong to a
thick galactic disk, and are thus old Population I stars. However, they may alternatively
belong to the even older galactic bulge
(Population II). The controversy may simply be a result of the different ways in which surveys
for RCB stars and related objects have been carried out. In either case, the populations
are sufficiently old that RCB stars must have relatively low masses (
).
A growing number of RCBs
have been discovered in the Large
MAGELLANIC CLOUD (LMC), most recently as a result of wide field surveys.
These are the only RCB stars for which a distance is known and hence for which
an absolute magnitude can be deduced. With
to -5, the LMC RCBs are
3000 - 10000 times more luminous than the Sun.