A. Giovagnoli et J. Mould, SPECTROSCOPY OF LONG-PERIOD VARIABLES IN M33, Publications of the Astronomical Society of the Pacific, 106(698), 1994, pp. 376-381
Citations number
20
Categorie Soggetti
Astronomy & Astrophysics
Journal title
Publications of the Astronomical Society of the Pacific
Spectrophotometry of 36 long-period variable stars in M33 is presented
. Most of them show strong TiO bands. These spectra together with publ
ished photometry indicate that the red variables exceeding 5 X 10(4) L
. are M supergiants, evolved from young massive stars which are promin
ent in this galaxy. A small number of lower-luminosity stars are prese
nt in this sample. These are asymptotic-giant-branch stars. We identif
y two of them as carbon stars. There are no strong S stars.