2015A&A...573A..13D


Query : 2015A&A...573A..13D

2015A&A...573A..13D - Astronomy and Astrophysics, volume 573A, 13-13 (2015/1-1)

FORS2/VLT survey of Milky Way globular clusters. I. Description of the method for derivation of metal abundances in the optical and application to NGC 6528, NGC 6553, M 71, NGC 6558, NGC 6426, and Terzan 8.

DIAS B., BARBUY B., SAVIANE I., HELD E.V., DA COSTA G.S., ORTOLANI S., VASQUEZ S., GULLIEUSZIK M. and KATZ D.

Abstract (from CDS):

We have observed almost one third of the globular clusters in the Milky Way, targeting distant and/or highly reddened objects, as well as a few reference clusters. A large sample of red giant stars was observed with FORS2 at VLT/ESO at R∼2000. The method for deriving stellar parameters is presented with application to six reference clusters. We aim at deriving the stellar parameters effective temperature, gravity, metallicity, and alpha-element enhancement as well as the radial velocity to confirm the membership of individual stars in each cluster. We analyse the spectra collected for the reference globular clusters NGC 6528 ([Fe/H]~-0.1), NGC 6553 ([Fe/H]~-0.2), M 71 ([Fe/H]~-0.8), NGC 6558 ([Fe/H]~-1.0), NGC 6426 ([Fe/H]~-2.1), and Terzan 8 ([Fe/H]~-2.2). They cover the full range of globular cluster metallicities, and are located in the bulge, disc, and halo. Full spectrum-fitting techniques were applied by comparing each target spectrum with a stellar library in the optical region at 4560-5860Å. We employed the library of observed spectra MILES, and the Coelho synthetic library. We validated the method by recovering the known atmospheric parameters for 49 well-studied stars that cover a wide range in the parameter space. We adopted as final stellar parameters (effective temperatures, gravities, metallicities) the average of results using the observed and synthetic spectral libraries. We identified 4 member stars in NGC 6528, 13 in NGC 6553, 10 in M 71, 5 in NGC 6558, 5 in NGC 6426, and 12 in Terzan 8. Radial velocities, Teff, log(g), [Fe/H], and alpha-element enhancements were derived. We derived <vhelio≥-242±11km/s, [Fe/H]=-2.39±0.04, [Mg/Fe]=0.38±0.06 for NGC 6426 from spectroscopy for the first time. The method proved to be reliable for red giant stars observed with resolution R∼2000, yielding results compatible with high-resolution spectroscopy. The derived α-element abundances show [α/Fe] vs. [Fe/H] consistent with that of field stars at the same metallicities.

Abstract Copyright:

Journal keyword(s): stars: abundances - stars: kinematics and dynamics - stars: Population II - globular clusters: general - Galaxy: stellar content

VizieR on-line data: <Available at CDS (J/A+A/573/A13): table3.dat table6.dat>

Nomenclature: Tables 3, 6: [DBS2015] NGCNNNN NN, [DBS2015] M71 NN, [DBS2015] TerzanN NN, N=86.

Simbad objects: 153

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Number of rows : 153
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 HD 245 SB* 00 08 50.8113967803 +86 47 16.384997325   9.02   8.0   G0 81 0
2 NGC 104 GlC 00 24 05.359 -72 04 53.20   5.78 4.09     ~ 3781 0
3 HD 2796 Pe* 00 31 16.9147531152 -16 47 40.790991624 9.58 9.28 8.50 8.14 8.67 Fw 188 0
4 * eps And PM* 00 38 33.3474310042 +29 18 42.311618884 5.72 5.25 4.38 3.70 3.19 G7IIIFe-3CH1 267 0
5 HD 4395 Pe* 00 46 13.7497935576 -11 27 08.552414592   8.39 7.68 7.33   G5/6III 76 0
6 NAME SGP reg 00 51 26.275 -27 07 41.70           ~ 554 0
7 HD 6833 * 01 09 52.2648344184 +54 44 20.278107384 8.81 7.91 6.74     K0IIIbFe-2 189 0
8 * 44 And PM* 01 10 18.7404097416 +42 04 53.309986932   6.249 5.665     F8V 178 0
9 HD 8724 RG* 01 26 17.5946147784 +17 07 35.123889432   9.29 8.34     G5 113 0
10 * 6 Per SB* 02 13 36.3431564393 +51 03 56.807950671   6.24   4.7   G8.5IIIbFe-2 127 0
11 * 27 Ari SB* 02 30 54.3979231272 +17 42 13.890810240   7.135 6.225     G8III-IVFe-2 114 0
12 HD 16458 Pe* 02 47 47.7257592048 +81 26 54.505744152   7.091 5.781     K1Ba5 157 0
13 HD 20512 SB* 03 18 27.1575825960 +15 10 38.485632792   8.20   6.9   G8V 93 0
14 HD 26297 Pe* 04 09 03.4178692512 -15 53 27.056905800   8.55 7.47 7.09   G5/6IVw 149 0
15 BD+06 648 Pe* 04 13 13.1126763288 +06 36 01.768985496   10.27 9.09 8.58   K0 101 0
16 * e Ori * 05 23 56.8276764 -07 48 29.033204 5.78 5.08 4.12 3.40 2.90 G8+III 142 0
17 HD 45282 Pe* 06 26 40.7720940072 +03 25 29.792391024 8.71 8.69 8.03     Gwl 147 0
18 * 8 Lyn RG* 06 37 41.3855533640 +61 28 52.448021750   6.83   5.4   G8IV-V 86 0
19 HD 63791 PM* 07 54 28.7247271128 +62 08 10.773103272   8.81 7.90     G0 108 0
20 HD 87140 PM* 10 04 43.1808079344 +54 20 43.425537648 9.70 9.68 8.98     K0 109 0
21 HD 105546 HB* 12 09 02.7215671248 +59 01 05.137388976   9.27 8.61 8.29   G2III: 109 0
22 HD 108317 Pe* 12 26 36.8319587208 +05 18 09.023783400       7.7   G2IVm-5 160 0
23 HD 117876 RG* 13 32 48.2138325552 +24 20 48.277563036   7.09 6.10 5.5   G8II-III 120 0
24 HD 122563 Pe* 14 02 31.8455084952 +09 41 09.944391876 7.47 7.10 6.19 5.37 4.79 G8:III:Fe-5 811 0
25 HD 122956 PM* 14 05 13.0244442888 -14 51 25.455804480   8.18 7.25 6.88   G6IV/VwF6 149 0
26 * alf Boo RG* 14 15 39.67207 +19 10 56.6730 2.46 1.18 -0.05 -1.03 -1.68 K1.5IIIFe-0.5 2257 0
27 BD+30 2611 * 15 06 53.8282684752 +30 00 36.941373756 11.50 10.37 9.13     G8III 134 0
28 * del Boo PM* 15 15 30.1629518 +33 18 53.392558 5.12 4.44 3.49 2.76 2.25 G8IIIFe-1 368 0
29 M 5 GlC 15 18 33.22 +02 04 51.7     5.95     ~ 1906 0
30 * omi CrB PM* 15 20 08.5586504208 +29 36 58.345262280 7.30 6.53 5.51     K0III 139 1
31 * iot Dra V* 15 24 55.7746265 +58 57 57.834445 5.68 4.45 3.29 2.51 1.91 K2III 393 1
32 * bet Dra * 17 30 25.9616959 +52 18 04.999351 4.43 3.79 2.81 2.12 1.64 G2Ib-IIa 405 0
33 BD+23 3130 Pe* 17 32 41.6247211304 +23 44 11.625460773       8.6   G0III 127 0
34 * 83 Her PM* 17 42 28.3623041280 +24 33 50.606295912   6.993 5.558     K4III 72 0
35 [DBS2015] NGC6426 4 * 17 44 49.42431 +03 12 34.4584     16.072   14.428 ~ 2 0
36 [DBS2015] NGC6426 2 * 17 44 50.11652 +03 13 09.3981     17.597   16.203 ~ 1 0
37 [DBS2015] NGC6426 10 * 17 44 51.65515 +03 10 06.7427     15.544   13.795 ~ 2 0
38 [DBS2015] NGC6426 3 * 17 44 52.82306 +03 12 58.1665     16.468   14.882 ~ 1 0
39 [DBS2015] NGC6426 13 * 17 44 52.88457 +03 09 05.8781     16.745   15.263 ~ 2 0
40 [DBS2015] NGC6426 11 * 17 44 53.40667 +03 09 53.7864     17.892   16.538 ~ 1 0
41 NGC 6426 GlC 17 44 54.71 +03 10 12.5           ~ 206 0
42 [DBS2015] NGC6426 9 * 17 44 55.78192 +03 10 28.6484     17.170   15.655 ~ 2 0
43 [DBS2015] NGC6426 18 * 17 44 57.73049 +03 07 03.0194     16.970   15.536 ~ 1 0
44 [DBS2015] NGC6426 7 * 17 44 59.2809644280 +03 11 25.181691864     17.666   16.207 ~ 2 0
45 [DBS2015] NGC6426 1 * 17 45 01.28057 +03 13 32.8158     18.018   16.659 ~ 1 0
46 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 13437 0
47 * 87 Her * 17 48 49.1462026080 +25 37 22.326301164   6.245 5.100     K0IIIb 114 0
48 NGC 6441 GlC 17 50 13.06 -37 03 05.2           ~ 846 0
49 [DBS2015] NGC6528 18 * 18 04 41.44195 -30 06 33.2055     16.666   14.899 ~ 1 0
50 [DBS2015] NGC6528 15 RG* 18 04 42.58094 -30 05 16.5255     15.892   13.830 ~ 1 0
51 [DBS2015] NGC6528 4 * 18 04 42.95844 -30 01 02.1137     15.596   13.339 ~ 1 0
52 [DBS2015] NGC6528 2 * 18 04 43.3759569288 -30 00 24.988249980     15.987   14.005 ~ 1 0
53 [DBS2015] NGC6528 19 * 18 04 43.97660 -30 06 39.2187     16.468   14.690 ~ 1 0
54 [DBS2015] NGC6528 16 * 18 04 44.23493 -30 05 33.7109     15.954   13.804 ~ 1 0
55 [DBS2015] NGC6528 13 * 18 04 45.10379 -30 04 29.0874     16.429   14.698 ~ 1 0
56 [DBS2015] NGC6528 5 * 18 04 45.20469 -30 01 25.4802     15.939   14.002 ~ 1 0
57 [DBS2015] NGC6528 17 RG* 18 04 45.70249 -30 06 07.5915     16.537   14.693 ~ 1 0
58 [DBS2015] NGC6528 3 RG* 18 04 46.40802 -30 00 41.2472     15.647   12.811 ~ 1 0
59 [SDH2012] NGC6528 1 3704 RG* 18 04 47.26529 -30 03 00.2663     16.501   14.727 ~ 2 0
60 [DBS2015] NGC6528 6 RG* 18 04 47.38600 -30 01 46.4159     17.060   15.319 ~ 1 0
61 [DBS2015] NGC6528 14 * 18 04 48.30573 -30 04 48.8684     16.032   13.976 ~ 1 0
62 [SDH2012] NGC6528 1 1044 RG* 18 04 48.32459 -30 03 36.3255     15.511   13.256 ~ 2 0
63 [DBS2015] NGC6528 8 * 18 04 48.65221 -30 02 36.4568     16.428   14.597 ~ 1 0
64 NGC 6528 GlC 18 04 49.61 -30 03 20.8   12.12 10.65     ~ 504 0
65 [SDH2012] NGC6528 1 2735 RG* 18 04 49.68820 -30 03 13.3834     16.145   14.138 ~ 2 0
66 [DBS2015] NGC6528 7 * 18 04 50.4081571464 -30 02 14.748882612     15.887   13.747 ~ 1 0
67 HD 166208 SB* 18 07 28.7442485448 +43 27 42.802503948   5.915 4.997     G8IIICN-1CH-3 145 0
68 [DBS2015] NGC6553 17 * 18 09 09.49237 -25 56 54.2598     15.065   12.216 ~ 1 0
69 [DBS2015] NGC6553 4 * 18 09 11.57202 -25 51 56.8943     15.310   12.692 ~ 1 0
70 [DBS2015] NGC6553 15 * 18 09 13.13055 -25 56 13.4151     14.980   11.984 ~ 1 0
71 [DBS2015] NGC6553 18 * 18 09 15.4803526080 -25 57 23.263054812     15.407   11.726 ~ 1 0
72 NGC 6553 GlC 18 09 15.68 -25 54 27.9   9.08       ~ 581 0
73 [DBS2015] NGC6553 14 * 18 09 15.79185 -25 55 48.1719     15.187   12.805 ~ 1 0
74 [DBS2015] NGC6553 6 * 18 09 15.88739 -25 52 46.3944     16.237   14.060 ~ 1 0
75 [DBS2015] NGC6553 13 * 18 09 17.65760 -25 55 29.6884     15.906   13.831 ~ 1 0
76 [DBS2015] NGC6553 7 * 18 09 18.19719 -25 53 17.9241     15.338   12.457 ~ 1 0
77 [DBS2015] NGC6553 5 * 18 09 18.40852 -25 52 23.9571     15.775   13.253 ~ 1 0
78 [DBS2015] NGC6553 16 * 18 09 18.73816 -25 56 37.0632     15.708   13.376 ~ 1 0
79 [DBS2015] NGC6553 11 RG* 18 09 18.90939 -25 54 39.9284     15.441   12.998 ~ 1 0
80 [DBS2015] NGC6553 9 * 18 09 21.83218 -25 54 02.7247     16.253   14.156 ~ 1 0
81 [DBS2015] NGC6553 10 * 18 09 22.54113 -25 54 25.8852     15.985   13.987 ~ 1 0
82 [DBS2015] NGC6553 19 * 18 09 22.58239 -25 57 46.8351     15.843   13.634 ~ 1 0
83 [DBS2015] NGC6553 8 * 18 09 24.03703 -25 53 34.1067     15.370   12.282 ~ 1 0
84 [DBS2015] NGC6553 3 * 18 09 24.17005 -25 51 49.1086     15.832   13.822 ~ 1 0
85 [DBS2015] NGC6553 1 * 18 09 24.86656 -25 50 58.9606     15.816   13.707 ~ 1 0
86 HD 166161 PM* 18 09 40.6841536776 -08 46 45.603012144 9.53 9.13 8.16     G0wF0 136 0
87 [DBS2015] NGC6558 16 * 18 10 13.55668 -31 48 44.9326     16.366   14.916 ~ 1 0
88 Cl* NGC 6558 BZO F97 * 18 10 15.1995981888 -31 46 01.430902308     16.037   14.467 ~ 6 0
89 [DBS2015] NGC6558 15 * 18 10 15.66405 -31 48 23.8579     16.480   15.187 ~ 1 0
90 [DBS2015] NGC6558 4 * 18 10 16.45142 -31 44 10.8154     16.541   15.100 ~ 1 0
91 [DBS2015] NGC6558 13 * 18 10 17.1715590432 -31 47 29.509332000     15.626   14.149 ~ 1 0
92 NGC 6558 GlC 18 10 17.6 -31 45 50           ~ 211 0
93 Cl* NGC 6558 BZO F42 V* 18 10 17.6656457016 -31 45 39.339024012     13.9   11.442 ~ 9 0
94 [DBS2015] NGC6558 11 * 18 10 18.18756 -31 46 43.8213     16.753   15.424 ~ 1 0
95 [DBS2015] NGC6558 10 * 18 10 18.52512 -31 46 23.9620     16.710   15.130 ~ 1 0
96 Cl* NGC 6558 BZO B11 * 18 10 19.0224376800 -31 44 50.613019980     15.902   14.275 ~ 6 0
97 [DBS2015] NGC6558 17 * 18 10 19.23918 -31 49 04.9990     16.964   15.616 ~ 1 0
98 [DBS2015] NGC6558 12 * 18 10 19.33174 -31 47 16.4867     16.521   15.069 ~ 1 0
99 [DBS2015] NGC6558 14 * 18 10 19.41707 -31 48 03.7905     16.740   15.552 ~ 1 0
100 Cl* NGC 6558 BZO B73 * 18 10 21.5036684280 -31 45 26.770633740     15.709   14.187 ~ 9 0
101 [DBS2015] NGC6558 19 * 18 10 22.54052 -31 49 55.7446     17.013   15.714 ~ 1 0
102 [DBS2015] NGC6558 18 * 18 10 27.16596 -31 49 34.6734     16.911   15.623 ~ 1 0
103 [DBS2015] NGC6558 5 * 18 10 29.13889 -31 44 48.8104     16.349   14.989 ~ 1 0
104 [DBS2015] NGC6558 3 * 18 10 29.41308 -31 44 00.6611     16.862   15.428 ~ 1 0
105 HD 167768 PM* 18 16 53.1010153824 -03 00 26.647248600   6.89 6.00     G8III 92 0
106 NGC 6618 OpC 18 20 47 -16 10.3           ~ 1574 0
107 HD 175305 RG* 18 47 06.4416868934 +74 43 31.451436187 8.07 7.93 7.18 6.52 6.03 G5III 209 0
108 NAME SDG G 18 55 03.1 -30 28 42   4.5 3.6     ~ 2032 2
109 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 1018 0
110 Cl Terzan 7 GlC 19 17 43.92 -34 39 27.8           ~ 407 0
111 Cl Arp 2 GlC 19 28 44.11 -30 21 20.3     12.41     ~ 338 0
112 V* V339 Sge LP* 19 38 12.0696686280 +16 48 25.633514592 12.88 10.73 8.70     K3II(e)p 137 0
113 [DBS2015] Terzan8 13 * 19 41 41.61179 -34 00 52.3297     17.364   16.263 ~ 1 0
114 Cl* Terzan 8 MBF 2124 * 19 41 42.8940473688 -33 58 56.209407996     16.865   15.707 ~ 4 0
115 Cl* Terzan 8 MBF 496 * 19 41 42.9285375576 -34 01 56.667830736     16.581   15.377 ~ 3 0
116 [DBS2015] Terzan8 5 * 19 41 43.1942857032 -33 57 42.729822864     17.002   15.867 ~ 2 0
117 Cl* Terzan 8 MBF 2503 * 19 41 43.8475838376 -33 58 04.967869116     17.320   16.198 ~ 3 0
118 Cl Terzan 8 GlC 19 41 44.41 -33 59 58.1     11.54     ~ 301 0
119 Cl* Terzan 8 OG 483 * 19 41 44.9256415848 -34 00 01.715638104   16.654 15.682   14.405 ~ 4 0
120 Cl* Terzan 8 MBF 526 * 19 41 45.0952420464 -34 01 50.545826832     16.227   15.017 ~ 3 0
121 Cl* Terzan 8 MBF 137 * 19 41 48.7759467552 -34 03 12.130461684     15.957   14.625 ~ 3 0
122 Cl* Terzan 8 MBF 2913 * 19 41 49.0541626656 -33 56 29.724772596     16.458   15.238 ~ 4 0
123 Cl* Terzan 8 MBF 1658 * 19 41 49.7909484744 -33 59 44.655225720     15.269   13.838 ~ 3 0
124 [DBS2015] Terzan8 10 * 19 41 53.73206 -34 00 10.1838     17.381   16.305 ~ 1 0
125 Cl* Terzan 8 MBF 530 * 19 41 55.6533325632 -34 01 48.233894484     15.288   13.881 ~ 4 0
126 Cl* Terzan 8 MBF 2357 * 19 42 00.0380476872 -33 58 21.628961796     15.072   13.570 ~ 4 0
127 HD 187111 Pe* 19 48 39.5744746680 -12 07 19.738101036   8.92 7.75     G8wF8III/IV 137 0
128 HD 188326 PM* 19 53 01.5410687855 +38 46 24.141758344   8.34 7.56 7.1   G8IVv 61 0
129 NGC 6838 1064 RG* 19 53 46.1566912560 +18 47 26.146446540   14.634 13.132   11.616 ~ 37 0
130 M 71 GlC 19 53 46.49 +18 46 45.1           ~ 1085 0
131 Cl* NGC 6838 AH H RG* 19 53 47.4715171200 +18 46 51.158511948   14 12.140   10.098 ~ 11 0
132 2MASS J19534796+1845493 RG* 19 53 47.9658672816 +18 45 49.338127908   15.487 14.292   12.978 ~ 4 0
133 NGC 6838 1045 RG* 19 53 48.2738208408 +18 48 02.321225604   14.080 12.346   10.657 ~ 50 0
134 Cl* NGC 6838 AH C RG* 19 53 48.5475438888 +18 44 49.146918936   15.65 14.580   13.371 ~ 21 0
135 2MASS J19534990+1849467 RG* 19 53 49.9070867952 +18 49 46.772870736   15.764 14.593   13.337 ~ 4 0
136 NGC 6838 1053 RG* 19 53 50.6409291720 +18 49 07.531926240   14.58 12.97   11.527 ~ 53 0
137 NGC 6838 1051 RG* 19 53 51.2031871344 +18 48 30.957112548   15.62 14.391   13.109 ~ 9 0
138 [DBS2015] M71 16 * 19 53 53.59026 +18 44 11.9701     14.727   13.496 ~ 1 0
139 NGC 6838 1026 * 19 53 56.5265651352 +18 47 11.701031640   15.74 14.421   13.141 ~ 3 0
140 2MASS J19535764+1847570 RG* 19 53 57.6464656104 +18 47 57.076716552   14.896 13.563   12.167 ~ 16 0
141 [KGS2008] J195357.6+184458 RG* 19 53 57.65305 +18 44 58.6142   14.65 13.74   12.70 ~ 2 0
142 * eta Cep PM* 20 45 17.3755540 +61 50 19.616737 4.960 4.320 3.410 2.76 2.27 K0IV 432 0
143 HD 204613 SB* 21 27 42.9670649688 +57 19 18.928743348       7.8   G1IIIa:_CH1.5 100 0
144 HD 204543 * 21 29 28.2126852216 -03 30 55.353564216   9.17 8.30 7.99   F6/8(V) 131 0
145 * 78 Dra PM* 21 43 04.0432859016 +72 19 12.307929132   6.234 5.173     K0-IIICN1 88 0
146 * 35 Peg PM* 22 27 51.5231162634 +04 41 44.404460456 6.74 5.86 4.80 4.02 3.46 K1-III-IV 262 0
147 HD 216174 PM* 22 49 46.3147714872 +55 54 09.996118956   6.598 5.439     K1III 73 0
148 HD 216143 Pe* 22 50 31.0883724288 -06 54 49.554279360   8.78 7.81 7.44   G2/3(IV)(we) 135 0
149 HD 216219 Pe* 22 50 52.1530053936 +18 00 07.703208072   8.06 7.44     G1II-III:Fe-1CH0.5 113 0
150 HD 218857 PM* 23 11 24.5948299440 -16 15 04.026507912   9.60 8.95     G5/8w(a) 107 0
151 * psi01 Aqr PM* 23 15 53.4940495770 -09 05 15.844964053 6.37 5.36 4.25 3.46 2.90 K1-IIIFe-0.5 237 1
152 * 14 And PM* 23 31 17.4132523248 +39 14 10.314703644   6.24   4.6   G8III 168 1
153 HD 221377 PM* 23 31 19.7268499200 +52 24 38.503436760   7.96 7.57     F7Vw 89 0

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2023.02.01-06:40:44

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