2018A&A...614A.109C


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.02CET02:44:38

2018A&A...614A.109C - Astronomy and Astrophysics, volume 614A, 109-109 (2018/6-1)

Observing multiple populations in globular clusters with the ESO archive: NGC 6388 reloaded.

CARRETTA E. and BRAGAGLIA A.

Abstract (from CDS):

The metal-rich and old bulge globular cluster (GC) NGC 6388 is one of the most massive Galactic GCs (M ∼ 106 M). However, the spectroscopic properties of its multiple stellar populations rested only on 32 red giants (only 7 of which observed with UVES, the others with GIRAFFE), given the difficulties in observing a rather distant cluster, heavily contaminated by bulge and disc field stars. We bypassed the problem using the resources of the largest telescope facility ever: the European Southern Observatory (ESO) archive. By selecting member stars identified by other programmes, we derive atmospheric parameters and the full set of abundances for 15 species from high-resolution UVES spectra of another 17 red giant branch stars in NGC 6388. We confirm that no metallicity dispersion is detectable in this GC. About 30% of the stars show the primordial composition of first-generation stars, about 20% present an extremely modified second-generation composition, and 50% have an intermediate composition. The stars are clearly distributed in the Al-O and Na-O planes in three discrete groups. We find substantial hints that more than a single class of polluters is required to reproduce the composition of the intermediate component in NGC 6388. In the heavily polluted component the sum Mg+Al increases as Al increases. The sum Mg+Al+Si is constant, and is the fossil record of hot H-burning at temperatures higher than about 70 MK in the first-generation polluters that contributed to form multiple populations in this cluster.

Abstract Copyright: © ESO 2018

Journal keyword(s): stars: abundances - stars: atmospheres - stars: Population II - globular clusters: general - globular clusters: individual: NGC 6388

Nomenclature: Table 1: [CB2018] ANN (Nos A01-A17).

Simbad objects: 26

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Number of rows : 26

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NGC 104 GlC 00 24 05.359 -72 04 53.20   5.78 4.09     ~ 3617 0
2 NGC 2808 GlC 09 12 03.10 -64 51 48.6   7.77 5.69     ~ 1277 0
3 NGC 5986 GlC 15 46 03.00 -37 47 11.1     6.92     ~ 317 0
4 [LMO2013] 7001565 * 17 36 02.2460289014 -44 40 47.773601177   18.03 16.51   14.70 ~ 2 0
5 [LMO2013] 200037 * 17 36 07.9692003713 -44 44 12.420711145   16.79 14.80   12.56 ~ 2 0
6 [LMO2013] 200316 * 17 36 08.149 -44 43 47.92   17.72 16.20   14.50 ~ 2 0
7 [LMO2013] 7000456 * 17 36 11.3993717030 -44 45 59.923797861   16.96 15.26   13.22 ~ 2 0
8 [LMO2013] 200148 * 17 36 12.0091904462 -44 42 23.906470398   17.32 15.40   13.21 ~ 2 0
9 [LMO2013] 7000313 * 17 36 12.0227710235 -44 42 05.578643753   17.14 15.23   12.91 ~ 2 0
10 [LMO2013] 200340 * 17 36 13.008 -44 44 20.79   17.77 16.33   14.68 ~ 2 0
11 [LMO2013] 200395 * 17 36 13.120 -44 45 12.41   17.88 16.44   14.82 ~ 2 0
12 [LMO2013] 100095 * 17 36 16.4607499338 -44 45 35.732349447   16.94 15.35   13.58 ~ 2 0
13 [LMO2013] 7000357 * 17 36 16.7261315314 -44 42 21.656232698   17.05 15.19   12.95 ~ 2 0
14 NGC 6388 GlC 17 36 17.461 -44 44 08.34   7.40       ~ 827 1
15 [CB2018] A16 * 17 36 19.880 -44 43 15.30   16.349 17.814     ~ 1 0
16 [LMO2013] 7000555 * 17 36 20.4649876352 -44 46 07.907400348   16.90 15.27   13.40 ~ 2 0
17 [LMO2013] 100162 * 17 36 21.294 -44 45 44.67   17.10 15.32   13.21 ~ 2 0
18 [CB2018] A07 * 17 36 25.860 -44 46 46.90   17.059 15.052     ~ 1 0
19 [LMO2013] 30828 * 17 36 26.3093705919 -44 44 12.084262690   16.90 14.96     ~ 2 0
20 [LMO2013] 7001303 * 17 36 27.094 -44 43 23.26   17.74 16.32   14.61 ~ 2 0
21 [LMO2013] 7000321 * 17 36 28.7139268385 -44 43 29.590683725   17.20 15.27   12.94 ~ 2 0
22 NGC 6441 GlC 17 50 13.06 -37 03 05.2   9.26 8.00     ~ 788 0
23 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 932 0
24 NGC 6752 GlC 19 10 52.11 -59 59 04.4   6.96 6.28     ~ 1835 0
25 M 15 GlC 21 29 58.33 +12 10 01.2   3       ~ 2942 0
26 NAME Galactic Bulge reg ~ ~           ~ 3531 0

    Equat.    Gal    SGal    Ecl

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2021.03.02-02:44:38

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