2019A&A...624A..24C

Query : 2019A&A...624A..24C

2019A&A...624A..24C - Astronomy and Astrophysics, volume 624A, 24-24 (2019/4-1)

Empirical estimates of the Na-O anti-correlation in 95 Galactic globular clusters.

CARRETTA E.

Abstract (from CDS):

Large star-to-star abundance variations are direct evidence of multiple stellar populations in Galactic globular clusters (GCs). The main and most widespread chemical signature is the anti-correlation of the stellar Na and O abundances. The interquartile range (IQR) of the [O/Na] ratio is well suited to quantifying the extent of the anti-correlation and to probe its links to global cluster parameters. However, since it is quite time consuming to obtain precise abundances from spectroscopy for large samples of stars in GCs, here we show empirical calibrations of IQR[O/Na] based on the O, Na abundances homogeneously derived from more than 2000 red giants in 22 GCs in our FLAMES survey. We find a statistically robust bivariate correlation of IQR as a function of the total luminosity (a proxy for mass) and cluster concentration c. Calibrated and observed values lie along the identity line when a term accounting for the horizontal branch (HB) morphology is added to the calibration, from which we obtained empirical values for 95 GCs. Spreads in proton-capture elements O and Na are found for all GCs in the luminosity range from MV=-3.76 to MV=-9.98. This calibration reproduces in a self-consistent picture the link of abundance variations in light elements with the He enhancements and its effect on the stellar distribution on the HB. We show that the spreads in light elements seem already to be dependent on the initial GC masses. The dependence of IQR on structural parameters stems from the well known correlation between c and MV, which is likely to be of primordial origin. Empirical estimates can be used to extend our investigation of multiple stellar populations to GCs in external galaxies, up to M 31, where even integrated light spectroscopy may currently provide only a hint of such a phenomenon.

Abstract Copyright: © ESO 2019

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

Simbad objects: 128

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Number of rows : 128
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 NGC 104 GlC 00 24 05.359 -72 04 53.20     4.09     ~ 3914 0
2 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 12643 1
3 NGC 288 GlC 00 52 45.24 -26 34 57.4   10 8.13     ~ 1041 0
4 NGC 362 GlC 01 03 14.26 -70 50 55.6     6.58     ~ 1084 0
5 NAME Fornax Dwarf Spheroidal G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1741 1
6 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7062 0
7 NGC 1261 GlC 03 12 16.21 -55 12 58.4     8.63     ~ 520 0
8 NAME Eridanus ClG GrG 03 38 32.00 -22 18 51.0           ~ 176 0
9 NAME E 1 GlC 03 55 02.5 -49 36 52           ~ 207 0
10 Cl Pal 2 GlC 04 46 05.91 +31 22 53.4   15       ~ 180 0
11 NGC 1815 Cl* 05 02 26.730 -70 37 19.89   12.43 12.41     ~ 18 0
12 NGC 1851 GlC 05 14 06.76 -40 02 47.6           ~ 1429 0
13 M 79 GlC 05 24 10.59 -24 31 27.3     8.16     ~ 816 0
14 NGC 2298 GlC 06 48 59.41 -36 00 19.1     8.89     ~ 497 0
15 Ton 1 HS? 07 03 38.8307252496 +26 35 31.995693132   14.4       ~ 9 0
16 NGC 2419 GlC 07 38 08.51 +38 52 54.9     10.05     ~ 931 0
17 NGC 2808 GlC 09 12 03.10 -64 51 48.6           ~ 1419 0
18 NAME Sextans C GlC 10 05 30.96 +00 04 15.4   15.5 13.9     ~ 327 1
19 NGC 3201 GlC 10 17 36.82 -46 24 44.9           ~ 884 0
20 GCl 17 GlC 11 29 16.80 +28 58 25.0   14.4       ~ 353 1
21 NGC 4147 GlC 12 10 06.149 +18 32 31.78   11.45 10.74     ~ 572 0
22 NGC 4372 GlC 12 25 45.43 -72 39 32.7   10.86 9.85     ~ 303 0
23 C 1235-509 GlC 12 38 40.20 -51 09 01.0           ~ 376 0
24 M 68 GlC 12 39 27.98 -26 44 38.6     7.96     ~ 997 0
25 NGC 4833 GlC 12 59 33.92 -70 52 35.4           ~ 425 0
26 M 53 GlC 13 12 55.25 +18 10 05.4     7.79     ~ 836 0
27 NGC 5053 GlC 13 16 27.09 +17 42 00.9     9.96     ~ 620 0
28 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3425 0
29 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2478 0
30 NGC 5286 GlC 13 46 26.81 -51 22 27.3           ~ 443 0
31 NGC 5466 GlC 14 05 27.29 +28 32 04.0     9.70     ~ 828 0
32 NGC 5634 GlC 14 29 37.28 -05 58 35.1   10.69 10.05     ~ 300 0
33 NGC 5694 GlC 14 39 36.52 -26 32 18.0           ~ 301 0
34 IC 4499 GlC 15 00 18.57 -82 12 49.6     8.56     ~ 351 0
35 NGC 5824 GlC 15 03 58.612 -33 04 06.70   10.28 9.56     ~ 408 0
36 NAME Serpens Dwarf GlC 15 16 05.30 -00 06 41.0   15.1       ~ 734 1
37 NGC 5897 GlC 15 17 24.40 -21 00 36.4   10.16 8.52     ~ 389 0
38 M 5 GlC 15 18 33.22 +02 04 51.7     5.95     ~ 1977 0
39 NGC 5927 GlC 15 28 00.69 -50 40 22.9           ~ 462 0
40 NGC 5986 GlC 15 46 03.00 -37 47 11.1     6.92     ~ 374 0
41 GCl 38 GlC 16 10 59.00 +14 57 42.0           ~ 367 0
42 Cl Lynga 7 OpC 16 11 03.65 -55 19 04.0           ~ 112 0
43 M 80 GlC 16 17 02.41 -22 58 33.9           ~ 715 0
44 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1848 0
45 NGC 6101 GlC 16 25 48.12 -72 12 07.9           ~ 294 0
46 NGC 6144 GlC 16 27 13.86 -26 01 24.6           ~ 243 0
47 NGC 6139 GlC 16 27 39.987 -38 50 57.03   11.03 9.68     ~ 214 0
48 ESO 390-6 GlC 16 28 40.10 -35 21 13.0     12.0     ~ 97 0
49 M 107 GlC 16 32 31.86 -13 03 13.6           ~ 786 0
50 ESO 452-11 GlC 16 39 25.50 -28 23 52.0           ~ 66 0
51 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2191 0
52 NGC 6229 GlC 16 46 58.641 +47 31 36.38   9.38 9.86     ~ 366 0
53 M 12 GlC 16 47 14.18 -01 56 54.7     6.07     ~ 676 0
54 NGC 6235 GlC 16 53 25.36 -22 10 38.8   11.99 7.20     ~ 186 0
55 M 10 GlC 16 57 09.05 -04 06 01.1     4.98     ~ 789 0
56 GCl 50 GlC 16 59 51.1 -00 32 00   15.70       ~ 200 1
57 M 62 GlC 17 01 12.60 -30 06 44.5           ~ 619 0
58 M 19 GlC 17 02 37.69 -26 16 04.6   8.45 5.57     ~ 369 1
59 NGC 6287 GlC 17 05 09.4906767360 -22 42 28.099250172   11.49 10.30     ~ 224 0
60 NGC 6304 GlC 17 14 32.25 -29 27 43.3           ~ 358 0
61 NGC 6316 GlC 17 16 37.42 -28 08 24.0   10.33 9.03     ~ 216 0
62 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 2115 0
63 M 9 GlC 17 19 11.78 -18 30 58.5   9.36 8.42     ~ 317 0
64 NGC 6356 GlC 17 23 34.99 -17 48 46.9   10.01 7.42     ~ 350 1
65 NGC 6352 GlC 17 25 29.11 -48 25 19.8           ~ 396 0
66 IC 1257 Bz? 17 27 06.00 -07 05 00.0           ~ 87 0
67 NGC 6366 GlC 17 27 44.24 -05 04 47.5           ~ 310 0
68 GCl 66.1 GlC 17 30 38.90 -31 35 44.0           ~ 117 0
69 NGC 6362 GlC 17 31 54.99 -67 02 54.0           ~ 585 0
70 Liller 1 Cl* 17 33 24.50 -33 23 20.0           ~ 263 0
71 NGC 6380 GlC 17 34 28.00 -39 04 09.0           ~ 140 0
72 Ton 2 GlC 17 36 10.500 -38 33 12.00           ~ 93 0
73 NGC 6388 GlC 17 36 17.461 -44 44 08.34           ~ 913 1
74 M 14 GlC 17 37 36.15 -03 14 45.3   9.55 5.73     ~ 385 0
75 NGC 6401 GlC 17 38 36.93 -23 54 31.5   11.31 10.71     ~ 172 0
76 NGC 6397 GlC 17 40 42.09 -53 40 27.6     5.17     ~ 1975 0
77 ESO 520-21 GlC 17 43 42.20 -26 13 21.0           ~ 178 0
78 NGC 6426 GlC 17 44 54.71 +03 10 12.5           ~ 222 0
79 Cl Terzan 5 Cl* 17 48 05.00 -24 46 48.0           ~ 845 1
80 NGC 6440 GlC 17 48 52.67 -20 21 34.5           ~ 550 0
81 NGC 6441 GlC 17 50 13.06 -37 03 05.2           ~ 884 0
82 NAME UKS 1 GlC 17 54 27.20 -24 08 43.0           ~ 93 0
83 NGC 6496 GlC 17 59 03.68 -44 15 57.4   9.96       ~ 225 0
84 ESO 456-38 GlC 18 01 49.10 -27 49 33.0           ~ 91 0
85 NGC 6517 GlC 18 01 50.376 -08 57 34.39   11.08       ~ 182 0
86 ESO 521-16 GlC 18 02 57.40 -26 04 00.0           ~ 99 0
87 NGC 6535 GlC 18 03 50.51 -00 17 51.5     9.85     ~ 294 0
88 NGC 6528 GlC 18 04 49.61 -30 03 20.8   12.12 10.65     ~ 524 0
89 NGC 6539 GlC 18 04 49.74 -07 35 09.1           ~ 225 0
90 NGC 6544 GlC 18 07 20.58 -24 59 50.4   11.36 9.90     ~ 296 0
91 NGC 6541 GlC 18 08 02.36 -43 42 53.6           ~ 377 0
92 NGC 6553 GlC 18 09 15.68 -25 54 27.9   9.08       ~ 600 0
93 IC 1276 GlC 18 10 44.26 -07 12 27.3           ~ 121 0
94 ESO 522-1 GlC 18 12 15.80 -22 44 31.0     14.86     ~ 95 1
95 NGC 6569 GlC 18 13 38.88 -31 49 35.2   10.78 9.47     ~ 238 0
96 NGC 6584 GlC 18 18 37.60 -52 12 56.8     8.17     ~ 288 0
97 M 28 GlC 18 24 32.89 -24 52 11.4           ~ 768 0
98 NGC 6638 GlC 18 30 56.25 -25 29 47.1   10.81 9.68     ~ 234 0
99 M 69 GlC 18 31 23.10 -32 20 53.1           ~ 462 0
100 NGC 6642 GlC 18 31 54.23 -23 28 34.1   11.30 10.24     ~ 206 0
101 NGC 6652 GlC 18 35 45.63 -32 59 26.6           ~ 437 0
102 M 22 GlC 18 36 23.94 -23 54 17.1           ~ 1377 0
103 ESO 591-12 GlC 18 41 29.90 -19 49 33.0           ~ 114 0
104 NGC 6712 GlC 18 53 04.32 -08 42 21.5           ~ 518 0
105 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 1067 0
106 NGC 6717 GlC 18 55 06.04 -22 42 05.3           ~ 244 0
107 NGC 6723 GlC 18 59 33.15 -36 37 56.1           ~ 499 0
108 NGC 6749 OpC 19 05 15.36 +01 54 00.0     12.4     ~ 157 0
109 NGC 6752 GlC 19 10 52.11 -59 59 04.4           ~ 2000 0
110 NGC 6760 GlC 19 11 12.06 +01 01 49.7   11.37 9.78     ~ 240 0
111 M 56 GlC 19 16 35.57 +30 11 00.5           ~ 422 0
112 Cl Terzan 7 GlC 19 17 43.92 -34 39 27.8           ~ 427 0
113 GCl 111 GlC 19 18 02.10 +18 34 18.0           ~ 111 0
114 Cl Arp 2 GlC 19 28 44.11 -30 21 20.3     12.41     ~ 354 0
115 M 55 GlC 19 39 59.71 -30 57 53.1     6.49     ~ 853 0
116 Cl Terzan 8 GlC 19 41 44.41 -33 59 58.1     11.54     ~ 321 0
117 GCl 114 GlC 19 45 14.40 -08 00 26.0     7.54     ~ 142 0
118 M 71 GlC 19 53 46.49 +18 46 45.1           ~ 1127 0
119 M 75 GlC 20 06 04.841 -21 55 20.14     8.26     ~ 366 0
120 NGC 6934 GlC 20 34 11.37 +07 24 16.1           ~ 422 0
121 M 72 GlC 20 53 27.70 -12 32 14.3     8.96     ~ 430 0
122 NGC 7006 GlC 21 01 29.465 +16 11 16.49     10.46     ~ 531 0
123 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3138 0
124 M 2 GlC 21 33 27.02 -00 49 23.7     6.25     ~ 1030 1
125 M 30 GlC 21 40 22.12 -23 10 47.5     7.10     ~ 1048 0
126 GCl 124 GlC 23 06 44.48 +12 46 19.2   15.6       ~ 277 1
127 NGC 7492 GlC 23 08 26.68 -15 36 41.3     10.48     ~ 300 0
128 NGC 104 47 * ~ ~           ~ 2 0

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