2017MNRAS.464.2730V

Query : 2017MNRAS.464.2730V

2017MNRAS.464.2730V - Mon. Not. R. Astron. Soc., 464, 2730-2740 (2017/January-3)

A spectroscopic study of the globular cluster M28 (NGC 6626).

VILLANOVA S., MONI BIDIN C., MAURO F., MUNOZ C. and MONACO L.

Abstract (from CDS):

We present the abundance analysis for a sample of 17 red giant branch stars in the metal-poor globular cluster M28 based on high-resolution spectra. This is the first extensive spectroscopic study of this cluster. We derive abundances of O, Na, Mg, Al, Si, Ca, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Y, Zr, Ba, La, Ce, and Eu. We find a metallicity of [Fe/H] = -1.29 ± 0.01 and an α-enhancement of +0.34 ± 0.01 (errors on the mean), typical of halo globular clusters in this metallicity regime. A large spread is observed in the abundances of light elements O, Na, and Al. Mg also shows an anti-correlation with Al with a significance of 3σ. The cluster shows a Na-O anti-correlation and a Na-Al correlation. This correlation is not linear but 'segmented' and that the stars are not distributed continuously, but form at least three well-separated sub-populations. In this aspect, M28 resembles NGC 2808 that was found to host at least five sub-populations. The presence of a Mg-Al anti-correlation favour massive AGB stars as the main polluters responsible for the multiple-population phenomenon.

Abstract Copyright: © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): globular clusters: individual: M28 (NGC 6626) - globular clusters: individual: M28 (NGC 6626)

VizieR on-line data: <Available at CDS (J/MNRAS/464/2730): table1.dat table2.dat table3.dat>

Simbad objects: 43

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Number of rows : 43
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NGC 288 GlC 00 52 45.24 -26 34 57.4   10 8.13     ~ 1130 0
2 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7988 0
3 NGC 1718 Cl* 04 52 25.040 -67 03 08.50   13.01 12.25     ~ 77 0
4 NGC 1851 GlC 05 14 06.76 -40 02 47.6           ~ 1529 0
5 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
6 NGC 2419 GlC 07 38 08.51 +38 52 54.9     10.05     ~ 998 0
7 NGC 2808 GlC 09 12 03.10 -64 51 48.6           ~ 1540 0
8 NAME Sextans dSph LSB 10 13 02.9 -01 36 53   12 10.4     ~ 921 0
9 NGC 3201 GlC 10 17 36.82 -46 24 44.9           ~ 1001 0
10 Cl Ruprecht 106 GlC 12 38 40.20 -51 09 01.0           ~ 413 0
11 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3677 0
12 NAME Bootes Dwarf Spheroidal Galaxy G 14 00 00.0 +14 30 00     12.8     ~ 491 0
13 Z 318-18 G 15 09 08.0 +67 13 21   13.60 10.6     ~ 1459 0
14 NAME Hercules Dwarf Galaxy G 16 31 02.0 +12 47 30     14.0     ~ 379 1
15 M 12 GlC 16 47 14.18 -01 56 54.7     6.07     ~ 736 0
16 Z 300-12 G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1428 1
17 NGC 6397 GlC 17 40 42.09 -53 40 27.6     5.17     ~ 2103 0
18 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
19 Cl Terzan 5 Cl* 17 48 05.00 -24 46 48.0           ~ 948 1
20 2MASS J18242731-2452349 RG* 18 24 27.314 -24 52 34.90           ~ 1 0
21 2MASS J18242792-2451160 RG* 18 24 27.9264931392 -24 51 16.040466504   16.07 14.64     ~ 5 0
22 2MASS J18242914-2452024 RG* 18 24 29.1432374904 -24 52 02.357056416           ~ 2 0
23 2MASS J18243130-2452471 RG* 18 24 31.2992347056 -24 52 47.165203740           ~ 4 0
24 2MASS J18243140-2451136 RG* 18 24 31.4020658664 -24 51 13.654680984           ~ 4 0
25 2MASS J18243191-2453293 RG* 18 24 31.9133207496 -24 53 29.345118252   15.03 13.39     ~ 4 0
26 2MASS J18243208-2452567 RG* 18 24 32.0784115800 -24 52 56.809516332           ~ 2 0
27 2MASS J18243227-2452471 RG* 18 24 32.2683948888 -24 52 47.220880404           ~ 1 0
28 M 28 GlC 18 24 32.89 -24 52 11.4           ~ 821 0
29 2MASS J18243318-2451079 RG* 18 24 33.1834429752 -24 51 07.916016132           ~ 2 0
30 2MASS J18243398-2451227 RG* 18 24 33.9777184104 -24 51 22.653135648           ~ 2 0
31 2MASS J18243399-2450583 RG* 18 24 33.9892601976 -24 50 58.333972488           ~ 2 0
32 2MASS J18243460-2452406 RG* 18 24 34.6012771488 -24 52 40.653625656           ~ 2 0
33 2MASS J18243590-2452090 RG* 18 24 35.909 -24 52 09.09           ~ 3 0
34 2MASS J18243627-2452221 RG* 18 24 36.2761471416 -24 52 22.222922556           ~ 2 0
35 2MASS J18243700-2451179 RG* 18 24 37.0006032456 -24 51 17.985519576   15.29 13.67     ~ 3 0
36 2MASS J18243713-2452257 RG* 18 24 37.1296873680 -24 52 25.808759040           ~ 2 0
37 2MASS J18243900-2451077 RG* 18 24 39.0003651360 -24 51 07.832647656   16.58 14.10     ~ 5 0
38 M 22 GlC 18 36 23.94 -23 54 17.1           ~ 1459 0
39 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 1164 0
40 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2438 2
41 NGC 6752 GlC 19 10 52.11 -59 59 04.4           ~ 2121 0
42 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3274 0
43 NAME Galactic Bulge reg ~ ~           ~ 4794 0

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