2001AJ....121.3114P

Query : 2001AJ....121.3114P

2001AJ....121.3114P - Astron. J., 121, 3114-3126 (2001/June-0)

VLT observations of the peculiar globular cluster NGC 6712. III. The evolved stellar population.

PALTRINIERI B., FERRARO F.R., PARESCE F. and DE MARCHI G.

Abstract (from CDS):

We present extensive UBVR photometry of the Galactic globular cluster (GGC) NGC 6712 obtained with the ESO Very Large Telescope (VLT) which reaches down to 2 mag below the main-sequence turn-off and allows us for the first time to determine the age of this cluster. By using the apparent luminosity of the zero age horizontal branch (ZAHB), VZAHB=16.32±0.05 and the stellar main-sequence (MS) turn-off (TO) magnitude VTO=19.82±0.10, we obtain ΔVHBTO=3.5±0.1 (a value fully compatible with that derived for other clusters), which suggests that, at an age of ∼12 Gyr, NGC 6712 is coeval with other GGC of similar metallicity.

We derive interstellar reddening by comparing the position and morphology of the red giant branch (RGB) with a wide variety of reference clusters and find E(B-V)=0.33±0.05, a value significantly lower than had been determined previously. Assuming this value for the reddening, we determine a true distance modulus of (m-M)0=14.55, corresponding to a distance of ∼8 kpc.

We find a population of 108 candidate blue straggler stars (BSSs), surprisingly large when compared with the typical BSS content of other low-concentration clusters. Moreover, we detect a very bright blue star in the core of NGC 6712 that might be a post-AGB star. These results, combined with those already presented in two companion papers, strongly support the hypothesis that NGC 6712 was, at some early epoch of its history, much more massive and concentrated. The continued interaction with the bulge and the disk of the Galaxy has driven it toward dissolution, and what we now observe is nothing but the remnant core of a cluster that once was probably one of the most massive in the Galaxy.


Abstract Copyright: ∼

Journal keyword(s): globular clusters: individual (NGC 6712) - Stars: Evolution - Stars: Population II

VizieR on-line data: <Available at CDS (J/AJ/121/3114): table1.dat table2.dat>

Nomenclature: Table 2, col(1): Cl* NGC 6712 BSS NNN (Nos 1-108), Cl* NGC 6712 EBSS N (Nos 1-5) = Table 2, col(2): Cl* NGC 6712 PFP NNNNN N=113 among about 30000.

CDS comments: Par. 2.3 : PG 1528, 2213 and 2331 are respectively PG 1528+062, 1528+062, 2213-006 and 2331+055. In reflist, ref. Sandage & Smith, 1966, 866 misprint for 886 (1966ApJ...144..886S).

Simbad objects: 140

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Number of rows : 140
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 NGC 2808 GlC 09 12 03.10 -64 51 48.6           ~ 1540 0
3 NGC 5053 GlC 13 16 27.09 +17 42 00.9     9.96     ~ 675 0
4 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2593 0
5 NAME vZ 1128 pA* 13 42 16.7509672392 +28 26 00.616904988   14.77 15.04 15.50   O8p 80 0
6 NGC 5897 GlC 15 17 24.40 -21 00 36.4   10.16 8.52     ~ 424 0
7 PG 1528+062 HS* 15 30 49.9257266448 +06 00 56.275796952 13.424 14.515 14.767 14.878 15.063 sdOB 38 0
8 M 80 GlC 16 17 02.41 -22 58 33.9           ~ 780 0
9 M 107 GlC 16 32 31.86 -13 03 13.6           ~ 835 0
10 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2291 0
11 M 12 GlC 16 47 14.18 -01 56 54.7     6.07     ~ 736 0
12 NGC 6362 GlC 17 31 54.99 -67 02 54.0           ~ 637 0
13 NGC 6388 GlC 17 36 17.461 -44 44 08.34           ~ 988 1
14 V* CH Sct Mi* 18 52 55.3776735456 -08 42 32.454633852   13.10 11.20   11.97 ~ 27 0
15 Cl* NGC 6712 BSS 66 * 18 52 58.2 -08 41 49   19.29 18.65     ~ 1 0
16 Cl* NGC 6712 BSS 19 * 18 52 58.6 -08 43 02   19.66 19.00     ~ 1 0
17 Cl* NGC 6712 PFP 3442 * 18 52 58.9 -08 42 37   18.11 17.27     ~ 1 0
18 Cl* NGC 6712 BSS 51 * 18 52 59.0 -08 42 13   19.81 19.03     ~ 1 0
19 Cl* NGC 6712 BSS 31 * 18 52 59.2 -08 42 39   19.21 18.60     ~ 1 0
20 Cl* NGC 6712 BSS 32 * 18 52 59.2 -08 42 37   19.47 18.79     ~ 1 0
21 Cl* NGC 6712 BSS 37 * 18 52 59.3 -08 42 28   18.13 17.68     ~ 1 0
22 Cl* NGC 6712 BSS 42 * 18 52 59.4 -08 42 24   19.97 19.32     ~ 1 0
23 V* MP Sct RR* 18 52 59.8366110048 -08 42 31.204430100     16.31   15.40 ~ 18 0
24 Cl* NGC 6712 BSS 15 * 18 53 00.3 -08 43 03   19.35 18.58     ~ 1 0
25 Cl* NGC 6712 BSS 75 * 18 53 00.7 -08 41 32   19.74 19.00     ~ 1 0
26 Cl* NGC 6712 BSS 81 * 18 53 01.0 -08 40 50   19.88 19.23     ~ 1 0
27 Cl* NGC 6712 BSS 38 * 18 53 01.3 -08 42 26   20.13 19.39     ~ 1 0
28 Cl* NGC 6712 BSS 13 * 18 53 01.7 -08 43 07   19.96 19.23     ~ 1 0
29 Cl* NGC 6712 BSS 44 * 18 53 01.8 -08 42 22   19.49 18.87     ~ 1 0
30 Cl* NGC 6712 BSS 1 * 18 53 01.9 -08 43 58   20.18 19.45     ~ 1 0
31 Cl* NGC 6712 BSS 12 * 18 53 01.9 -08 43 07   18.93 18.36     ~ 1 0
32 Cl* NGC 6712 BSS 56 * 18 53 01.9 -08 42 04   19.00 18.32     ~ 1 0
33 Cl* NGC 6712 BSS 55 * 18 53 02.1807823776 -08 42 06.683438448   19.82 19.01     ~ 1 0
34 Cl* NGC 6712 BSS 5 * 18 53 02.4 -08 43 33   18.68 18.02     ~ 1 0
35 Cl* NGC 6712 BSS 25 * 18 53 02.4 -08 42 49   19.49 18.79     ~ 1 0
36 Cl* NGC 6712 BSS 36 * 18 53 02.4 -08 42 29   20.15 19.38     ~ 1 0
37 Cl* NGC 6712 BSS 49 * 18 53 02.4 -08 42 19   20.23 19.50     ~ 1 0
38 Cl* NGC 6712 BSS 72 * 18 53 02.4 -08 41 37   19.42 18.76     ~ 1 0
39 OGLE GD-RRLYR-9179 RR* 18 53 02.4247106688 -08 42 13.866036192   17.00 16.15   15.32 ~ 11 0
40 Cl* NGC 6712 BSS 26 * 18 53 02.5 -08 42 49   19.93 19.23     ~ 1 0
41 Cl* NGC 6712 BSS 85 * 18 53 02.5 -08 42 30   19.87 19.15     ~ 1 0
42 Cl* NGC 6712 BSS 27 * 18 53 02.6 -08 42 45   19.96 19.25     ~ 1 0
43 Cl* NGC 6712 BSS 69 * 18 53 02.7 -08 41 47   19.78 18.99     ~ 1 0
44 Cl* NGC 6712 BSS 89 * 18 53 02.8 -08 42 24   19.92 19.23     ~ 1 0
45 Cl* NGC 6712 BSS 68 * 18 53 02.8 -08 41 46   19.77 18.96     ~ 1 0
46 Cl* NGC 6712 BSS 100 * 18 53 03.0 -08 42 06   19.57 18.77     ~ 1 0
47 Cl* NGC 6712 BSS 106 * 18 53 03.1 -08 42 23   19.87 19.14     ~ 1 0
48 Cl* NGC 6712 BSS 101 * 18 53 03.1 -08 42 05   19.92 19.22     ~ 1 0
49 Cl* NGC 6712 SAW V19 RR* 18 53 03.2046090480 -08 41 39.090246324   16.82 16.00   15.19 ~ 10 0
50 Cl* NGC 6712 BSS 104 * 18 53 03.29 -08 42 34.6   19.04 18.40     ~ 1 0
51 Cl* NGC 6712 BSS 6 * 18 53 03.3 -08 43 18   19.31 18.66     ~ 1 0
52 Cl* NGC 6712 BSS 18 * 18 53 03.3 -08 43 02   20.14 19.48     ~ 1 0
53 Cl* NGC 6712 BSS 95 * 18 53 03.3 -08 42 12   19.10 18.46     ~ 1 0
54 Cl* NGC 6712 BSS 54 * 18 53 03.3 -08 42 08   19.95 19.28     ~ 1 0
55 Cl* NGC 6712 PFP 2533 * 18 53 03.6 -08 42 50   17.92 17.14     ~ 1 0
56 Cl* NGC 6712 BSS 48 * 18 53 03.6 -08 42 21   20.05 19.27     ~ 1 0
57 Cl* NGC 6712 BSS 7 * 18 53 03.8 -08 43 18   19.24 18.57     ~ 1 0
58 Cl* NGC 6712 BSS 90 * 18 53 03.8 -08 42 22   19.00 18.28     ~ 1 0
59 Cl* NGC 6712 BSS 94 * 18 53 03.8 -08 42 20   19.29 18.59     ~ 1 0
60 Cl* NGC 6712 BSS 93 * 18 53 03.9 -08 42 20   18.71 18.18     ~ 1 0
61 Cl* NGC 6712 BSS 87 * 18 53 04.0 -08 42 30   19.05 18.34     ~ 1 0
62 Cl* NGC 6712 BSS 50 * 18 53 04.0 -08 42 17   19.34 18.58     ~ 1 0
63 Cl* NGC 6712 BSS 14 * 18 53 04.1 -08 43 06   19.43 18.76     ~ 1 0
64 Cl* NGC 6712 BSS 47 * 18 53 04.1 -08 42 22   19.60 18.87     ~ 1 0
65 Cl* NGC 6712 SAW V20 RR* 18 53 04.1489264400 -08 42 03.568586976   16.65 16.20   15.48 ~ 15 0
66 Cl* NGC 6712 BSS 35 * 18 53 04.2 -08 42 32   19.36 18.60     ~ 1 0
67 Cl* NGC 6712 BSS 53 * 18 53 04.2 -08 42 12   19.34 18.61     ~ 1 0
68 Cl* NGC 6712 BSS 8 * 18 53 04.3 -08 43 17   19.36 18.79     ~ 1 0
69 Cl* NGC 6712 BSS 28 * 18 53 04.3 -08 42 45   19.19 18.56     ~ 1 0
70 Cl* NGC 6712 BSS 107 * 18 53 04.3 -08 42 26   19.76 19.02     ~ 1 0
71 NGC 6712 GlC 18 53 04.32 -08 42 21.5           ~ 550 0
72 Cl* NGC 6712 BSS 105 * 18 53 04.5 -08 42 27   19.83 19.14     ~ 1 0
73 Cl* NGC 6712 BSS 92 * 18 53 04.5 -08 42 21   19.92 19.16     ~ 1 0
74 Cl* NGC 6712 BSS 91 * 18 53 04.5 -08 42 21   18.96 18.31     ~ 1 0
75 Cl* NGC 6712 PFP 816 * 18 53 04.56 -08 43 26.6   18.16 17.31     ~ 1 0
76 Cl* NGC 6712 BSS 84 * 18 53 04.6 -08 40 42   19.67 19.03     ~ 1 0
77 Cl* NGC 6712 BSS 10 * 18 53 04.7 -08 43 11   19.62 18.93     ~ 1 0
78 Cl* NGC 6712 BSS 86 * 18 53 04.7 -08 42 30   19.67 18.92     ~ 1 0
79 Cl* NGC 6712 BSS 88 * 18 53 04.7 -08 42 25   18.63 18.03     ~ 1 0
80 Cl* NGC 6712 BSS 98 * 18 53 04.7 -08 42 08   19.36 18.69     ~ 1 0
81 Cl* NGC 6712 BSS 102 * 18 53 04.7 -08 42 02   18.12 17.48     ~ 1 0
82 4U 1850-086 LXB 18 53 04.89 -08 42 19.7 20.40 21.20 21.0     ~ 266 1
83 Cl* NGC 6712 BSS 96 * 18 53 04.9 -08 42 10   18.27 17.59     ~ 1 0
84 Cl* NGC 6712 BSS 59 * 18 53 04.9 -08 41 59   18.46 17.85     ~ 1 0
85 Cl* NGC 6712 BSS 64 * 18 53 04.9 -08 41 50   19.73 18.91     ~ 1 0
86 Cl* NGC 6712 BSS 74 * 18 53 04.9 -08 41 33   19.16 18.43     ~ 1 0
87 Cl* NGC 6712 BSS 108 * 18 53 05.1 -08 42 20   19.14 18.50     ~ 1 0
88 Cl* NGC 6712 BSS 99 * 18 53 05.1 -08 42 07   18.86 18.31     ~ 1 0
89 Cl* NGC 6712 BSS 103 * 18 53 05.3 -08 41 58   19.33 18.58     ~ 1 0
90 Cl* NGC 6712 SAW V6 RR* 18 53 05.3362497576 -08 42 53.501630184   16.16 16.45   15.56 ~ 16 0
91 Cl* NGC 6712 BSS 16 * 18 53 05.4 -08 43 02   19.77 19.12     ~ 1 0
92 Cl* NGC 6712 BSS 17 * 18 53 05.4 -08 43 01   19.54 18.77     ~ 1 0
93 Cl* NGC 6712 BSS 70 * 18 53 05.4 -08 41 46   19.74 18.98     ~ 1 0
94 Cl* NGC 6712 BSS 24 * 18 53 05.6 -08 42 52   19.71 19.08     ~ 1 0
95 Cl* NGC 6712 BSS 67 * 18 53 05.6 -08 41 47   19.54 18.87     ~ 1 0
96 Cl* NGC 6712 BSS 23 * 18 53 05.7 -08 42 52   20.05 19.36     ~ 1 0
97 Cl* NGC 6712 BSS 33 * 18 53 05.7 -08 42 35   18.23 17.62     ~ 1 0
98 Cl* NGC 6712 BSS 22 * 18 53 05.8 -08 42 52   19.78 19.09     ~ 1 0
99 Cl* NGC 6712 BSS 97 * 18 53 05.8 -08 42 11   19.89 19.13     ~ 1 0
100 Cl* NGC 6712 BSS 58 * 18 53 05.8 -08 42 01   19.13 18.52     ~ 1 0
101 Cl* NGC 6712 BSS 29 * 18 53 05.9 -08 42 42   19.82 19.10     ~ 1 0
102 Cl* NGC 6712 BSS 43 * 18 53 05.9 -08 42 23   18.40 17.95     ~ 1 0
103 Cl* NGC 6712 BSS 79 * 18 53 05.9 -08 40 58   18.89 18.20     ~ 1 0
104 Cl* NGC 6712 BSS 34 * 18 53 06.0 -08 42 34   19.49 18.69     ~ 1 0
105 Cl* NGC 6712 SAW V12 RR* 18 53 06.0023863752 -08 41 33.271955808   16.10 16.30   15.278 ~ 19 0
106 Cl* NGC 6712 BSS 30 * 18 53 06.2 -08 42 42   19.30 18.72     ~ 1 0
107 Cl* NGC 6712 BSS 73 * 18 53 06.3 -08 41 37   19.30 18.68     ~ 1 0
108 Cl* NGC 6712 BSS 46 * 18 53 06.5 -08 42 22   19.90 19.28     ~ 1 0
109 Cl* NGC 6712 BSS 82 * 18 53 06.51 -08 40 41.7   20.02 19.24     ~ 1 0
110 Cl* NGC 6712 BSS 11 * 18 53 06.6 -08 43 11   19.11 18.52     ~ 1 0
111 Cl* NGC 6712 BSS 45 * 18 53 06.6 -08 42 22   19.23 18.63     ~ 1 0
112 Cl* NGC 6712 BSS 63 * 18 53 06.7 -08 41 53   19.77 19.08     ~ 1 0
113 Cl* NGC 6712 BSS 78 * 18 53 06.7 -08 41 18   18.81 18.19     ~ 1 0
114 Cl* NGC 6712 BSS 20 * 18 53 06.8 -08 43 00   19.57 18.81     ~ 1 0
115 Cl* NGC 6712 BSS 57 * 18 53 06.8 -08 42 03   19.80 19.13     ~ 1 0
116 Cl* NGC 6712 BSS 62 * 18 53 06.8 -08 41 53   19.05 18.32     ~ 1 0
117 Cl* NGC 6712 BSS 77 * 18 53 07.5 -08 41 22   18.64 18.04     ~ 1 0
118 Cl* NGC 6712 BSS 52 * 18 53 07.6 -08 42 10   18.99 18.39     ~ 1 0
119 Cl* NGC 6712 PFP 1692 * 18 53 07.8 -08 43 07   18.18 17.33     ~ 1 0
120 Cl* NGC 6712 BSS 71 * 18 53 07.8 -08 41 46   19.95 19.20     ~ 1 0
121 Cl* NGC 6712 BSS 76 * 18 53 07.8 -08 41 24   19.86 19.08     ~ 1 0
122 Cl* NGC 6712 BSS 80 * 18 53 07.8 -08 40 51   19.82 19.04     ~ 1 0
123 Cl* NGC 6712 BSS 9 * 18 53 08.2 -08 43 16   19.25 18.51     ~ 1 0
124 Cl* NGC 6712 BSS 21 * 18 53 08.2 -08 42 54   20.14 19.39     ~ 1 0
125 Cl* NGC 6712 BSS 39 * 18 53 08.3 -08 42 22   20.07 19.29     ~ 1 0
126 Cl* NGC 6712 BSS 83 * 18 53 08.4 -08 40 43   19.99 19.24     ~ 1 0
127 OGLE GD-RRLYR-9189 RR* 18 53 08.6626488744 -08 43 23.927341512   16.0 16.41   15.44 ~ 17 0
128 V* AP Sct Mi* 18 53 08.7721761240 -08 41 56.664861792     12.55 12.955 10.50 ~ 22 0
129 Cl* NGC 6712 BSS 40 * 18 53 08.9 -08 42 25   19.05 18.32     ~ 1 0
130 Cl* NGC 6712 BSS 3 * 18 53 09.5 -08 43 50   19.27 18.56     ~ 1 0
131 Cl* NGC 6712 BSS 41 * 18 53 09.6 -08 42 24   19.17 18.61     ~ 1 0
132 Cl* NGC 6712 PFP 3437 * 18 53 09.8 -08 42 39   17.94 17.19     ~ 1 0
133 Cl* NGC 6712 BSS 4 * 18 53 09.9 -08 43 38   18.33 17.75     ~ 1 0
134 Cl* NGC 6712 BSS 2 * 18 53 10.0 -08 43 57   20.10 19.36     ~ 1 0
135 Cl* NGC 6712 BSS 60 * 18 53 10.6238628144 -08 41 58.327974672   18.67 18.04     ~ 1 0
136 Cl* NGC 6712 BSS 65 * 18 53 11.8 -08 41 50   19.97 19.19     ~ 1 0
137 NGC 6723 GlC 18 59 33.15 -36 37 56.1           ~ 543 0
138 PG 2213-006 HS* 22 16 28.3762385784 -00 21 13.503339864 12.747 13.93 14.14 14.54 14.348 sdOB 79 0
139 PG 2331+055 HS? 23 33 44.4698554608 +05 46 39.793017432 14.629 15.116 15.182 15.194 15.226 sd 36 0
140 NAME Scutum Region reg ~ ~           ~ 33 0

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