Release 11.12 ("Hergest Ridge")
Article ID: gc497 | |
Author | Lapenna, E. et al. |
Title | Chemical Analysis of Asymptotic Giant Branch Stars in M62 |
Journal | The Astrophysical Journal, Volume 813, Issue 2, article id. 97, 13 pp. |
Year of publication | 2015 (on gclusters from 2015-11-25 10:03:11 ) |
Abstract | We have collected UVES-FLAMES high-resolution spectra for a sample of 6 asymptotic giant branch (AGB) and 13 red giant branch (RGB) stars in the Galactic globular cluster (GC) M62 (NGC 6266). Here we present the detailed abundance analysis of iron, titanium, and light elements (O, Na, Mg, and Al). For the majority (five out of six) of the AGB targets, we find that the abundances of both iron and titanium determined from neutral lines are significantly underestimated with respect to those obtained from ionized features, the latter being, instead, in agreement with those measured for the RGB targets (...) We can thus conclude that none of the investigated AGB stars belongs to the second stellar generation of M62. We also find an RGB star with extremely high sodium abundance ([Na/Fe] = +1.08 dex). |
Tags | NGC 6266 |
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