Release 11.12 ("Hergest Ridge")


Gclusters :: Bibliographic item "gc520"

Article ID: gc520
AuthorLardo, C. et al.
TitleMultiple populations along the asymptotic giant branch of the globular cluster M4
JournalMNRAS, Volume 466, Issue 3, p.3507-3512
Year of publication2017 (on gclusters from 2017-02-03 10:50:58 )
AbstractNearly all Galactic globular clusters host stars that display characteristic abundance anticorrelations, like the O-rich/Na-poor pattern typical of field halo stars, together with O-poor/Na-rich additional components. A recent spectroscopic investigation questioned the presence of O-poor/Na-rich stars amongst a sample of asymptotic giant branch (AGB) stars in the cluster M4, at variance with the spectroscopic detection of a O-poor/Na-rich component along both the cluster red giant branch (RGB) and horizontal branch. This is contrary to what is expected from the cluster horizontal branch morphology and horizontal branch stellar evolution models. Here, we have investigated this issue by employing the CUBI = (U - B) - (B - I) index, that previous studies have demonstrated to be very effective in separating multiple populations along both the RGB and AGB sequences...
TagsNGC 6121

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