2018A&A...616A.181M


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.03CEST21:37:59

2018A&A...616A.181M - Astronomy and Astrophysics, volume 616A, 181-181 (2018/8-1)

Chemical abundance analysis of red giant branch stars in the globular cluster E3.

MONACO L., VILLANOVA S., CARRARO G., MUCCIARELLI A. and MONI BIDIN C.

Abstract (from CDS):


Context. Globular clusters are known to host multiple stellar populations, which are a signature of their formation process. The globular cluster E3 is one of the few low-mass globulars that is thought not to host multiple populations.
Aims. We investigate red giant branch stars in E3 with the aim of providing a first detailed chemical inventory for this cluster, we determine its radial velocity, and we provide additional insights into the possible presence of multiple populations in this cluster.
Methods. We obtained high-resolution FLAMES-UVES/VLT spectra of four red giant branch stars likely members of E3. We performed a local thermodynamic equilibrium abundance analysis based on one-dimensional plane parallel ATLAS9 model atmospheres. Abundances were derived from line equivalent widths or spectrum synthesis.
Results. We measured abundances of Na and of iron peak (Fe, V, Cr, Ni, Mn), α(Mg, Si, Ca, Ti), and neutron capture elements (Y, Ba, Eu). The mean cluster heliocentric radial velocity, metallicity, and sodium abundance ratio are νhelio=12.6±0.4km/s (σ=0.6±0.2km/s), [Fe/H]=-0.89±0.08dex, and [Na/Fe]=0.18±0.07dex, respectively. The low Na abundance with no appreciable spread is suggestive of a cluster dominated by first-generation stars in agreement with results based on lower resolution spectroscopy. The low number of stars observed does not allow us to rule out a minor population of second-generation stars. The observed chemical abundances are compatible with the trends observed in Milky Way stars.

Abstract Copyright: © ESO 2018

Journal keyword(s): stars: abundances - stars: atmospheres - globular clusters: individual: E3

Nomenclature: Table 1: [MVC2018b] E3 NNN N=7 among (Nos 1-132).

Simbad objects: 22

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Number of rows : 22

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NGC 104 GlC 00 24 05.359 -72 04 53.20   5.78 4.09     ~ 3547 0
2 NGC 121 GlC 00 26 49.0 -71 32 10   11.2 11.24     ~ 275 0
3 NGC 288 GlC 00 52 45.24 -26 34 57.4   10 8.13     ~ 918 0
4 NGC 1851 GlC 05 14 06.76 -40 02 47.6   8.80 7.23     ~ 1241 0
5 [MVC2018b] E3 107 RG* 09 20 16.7108920906 -77 15 56.875332302   17.027 15.889   14.67 ~ 2 0
6 [MVC2018b] E3 121 RG* 09 20 21.8799422441 -77 18 47.797830316     16.58   15.02 ~ 1 0
7 [MVC2018b] E3 132 RG* 09 20 45.8003463877 -77 15 12.033390561     17.42   15.80 ~ 1 0
8 [MVC2018b] E3 1 RG* 09 20 50.6298448340 -77 19 55.743455707   18.315 17.270   16.21 ~ 2 0
9 NAME E 3 GlC 09 20 57.07 -77 16 54.8           ~ 128 0
10 [MVC2018b] E3 99 RG* 09 21 01.0076510266 -77 16 34.303298768   18.178 17.150   16.07 ~ 2 0
11 [MVC2018b] E3 67 RG* 09 21 15.6766831391 -77 18 04.056534692   17.320 16.194   15.00 ~ 2 0
12 [MVC2018b] E3 100 RG* 09 21 50.6509515166 -77 16 34.267476483     17.41   16.02 ~ 1 0
13 C 1235-509 GlC 12 38 40.20 -51 09 01.0           ~ 322 0
14 GCl 38 GlC 16 10 59.00 +14 57 42.0           ~ 324 0
15 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1676 0
16 ESO 452-11 GlC 16 39 25.50 -28 23 52.0           ~ 44 0
17 NGC 6362 GlC 17 31 54.99 -67 02 54.0   9.72 8.86     ~ 487 0
18 NGC 6535 GlC 18 03 50.51 -00 17 51.5   11.35 9.85     ~ 241 0
19 NAME SDG G 18 55 03.1 -30 28 42   4.5 3.6     ~ 1737 2
20 Cl Terzan 7 GlC 19 17 43.92 -34 39 27.8           ~ 359 0
21 Cl Terzan 8 GlC 19 41 44.41 -33 59 58.1     11.54     ~ 256 0
22 Cl Pal 12 GlC 21 46 38.84 -21 15 09.4     11.89     ~ 449 0

    Equat.    Gal    SGal    Ecl

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2020.07.03-21:37:59

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