Query : 2014A&A...568L...4K

2014A&A...568L...4K - Astronomy and Astrophysics, volume 568, L4-4 (2014/8-1)

Galactic globular cluster 47 Tucanae: new ties between the chemical and dynamical evolution of globular clusters?


Abstract (from CDS):

It is generally accepted today that Galactic globular clusters (GGCs) consist of at least two generations of stars that are different in their chemical composition and perhaps age. However, knowledge about the kinematical properties of these stellar generations, which may provide important information for constraining evolutionary scenarios of the GGCs, is still limited. We study the connections between chemical and kinematical properties of different stellar generations in the Galactic globular cluster 47 Tuc. To achieve this goal, we used abundances of Li, O, and Na determined in 101 main sequence turn-off (TO) stars with the aid of 3D hydrodynamical model atmospheres and NLTE abundance analysis methodology. We divided our sample TO stars into three groups according to their position in the [Li/Na]-[Na/O] plane to study their spatial distribution and kinematical properties. We find that there are statistically significant radial dependencies of lithium and oxygen abundances, A(Li) and A(O), as well as that of [Li/Na] abundance ratio. Our results show that first-generation stars are less centrally concentrated and dynamically hotter than stars belonging to subsequent generations. We also find a significant correlation between the velocity dispersion and O and Na abundance, and between the velocity dispersion and the [Na/O] abundance ratio.

Abstract Copyright:

Journal keyword(s): globular clusters: general - globular clusters: individual: 47 Tuc - stars: Population II - stars: abundances - stars: kinematics and dynamics

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 NGC 104 GlC 00 24 05.359 -72 04 53.20   5.78 4.09     ~ 3785 0
2 NGC 2808 GlC 09 12 03.10 -64 51 48.6           ~ 1365 0
3 NGC 6388 GlC 17 36 17.461 -44 44 08.34   7.40       ~ 876 1
4 NGC 6441 GlC 17 50 13.06 -37 03 05.2           ~ 847 0

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