2014A&A...570A..48S

Query : 2014A&A...570A..48S

2014A&A...570A..48S - Astronomy and Astrophysics, volume 570A48-48 (2014/10-1)

Gemini spectroscopy of the outer disk star cluster BH 176.

SHARINA M.E., DONZELLI C.J., DAVOUST E., SHIMANSKY V.V. and CHARBONNEL C.

Abstract (from CDS):

BH176 is an old metal-rich star cluster. It is spatially and kinematically consistent with belonging to the Monoceros Ring. It is larger in size and more distant from the Galactic plane than typical open clusters, and it does not belong to the Galactic bulge. Our aim is to determine the origin of this unique object by accurately determining its distance, metallicity, and age. The best way to reach this goal is to combine spectroscopic and photometric methods. We present medium-resolution observations of red clump and red giant branch stars in BH176 obtained with the Gemini South Multi-Object Spectrograph. We derive radial velocities, metallicities, effective temperatures, and surface gravities of the observed stars and use these parameters to distinguish member stars from field objects. We determine the following parameters for BH176: Vh=0±15km/s, [Fe/H]=-0.1±0.1, age 7±0.5Gyr, E(V-I)=0.79±0.03, distance 15.2±0.2kpc, α-element abundance [α/Fe]∼0.25dex (the mean of [Mg/Fe], and [Ca/Fe]). BH176 is a member of old Galactic open clusters that presumably belong to the thick disk. It may have originated as a massive star cluster after the encounter of the forming thin disk with a high-velocity gas cloud or as a satellite dwarf galaxy.

Abstract Copyright: ∼

Journal keyword(s): globular clusters: general - globular clusters: individual: BH176 - open clusters and associations: general - Galaxy: structure - Galaxy: formation

Nomenclature: Table A.1: [SDD2014] NNa (Nos 1a-41a), [SDD2014] NNa (Nos 1b-39b).

Simbad objects: 112

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Number of rows : 112
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 188 OpC 00 47 14.8 +85 14 42           ~ 990 0
2 Cl King 2 OpC 00 50 57.3 +58 11 09   21.39 19.78     ~ 71 0
3 NAME Sagittarius Stream St* 02 22 +00.0           ~ 1001 0
4 NGC 1193 OpC 03 05 56.4 +44 22 58     12.6     ~ 97 0
5 Cl Berkeley 17 OpC 05 20 30.5 +30 34 20           ~ 192 0
6 Cl King 22 OpC 05 22 09.7 +45 26 30           ~ 81 0
7 Cl Berkeley 70 OpC 05 25 51.6 +41 57 41           ~ 45 0
8 Cl Berkeley 20 OpC 05 32 36.8 +00 11 06           ~ 129 0
9 NAME Gal Anticenter reg 05 46 +28.9           ~ 1024 0
10 Cl Trumpler 5 OpC 06 36 31.8 +09 28 03           ~ 146 0
11 Cl Collinder 106 OpC 06 37 02.6 +05 59 54     4.6     ~ 55 0
12 Cl Berkeley 25 OpC 06 41 16.1 -16 28 58           ~ 67 0
13 Cl Berkeley 75 OpC 06 49 00.0 -23 59 51           ~ 71 0
14 NAME Saurer A Cluster OpC 07 20.9 +01 48           ~ 70 0
15 Cl Berkeley 39 OpC 07 46 48.1 -04 39 59           ~ 209 1
16 * ome Vir LP* 11 38 27.6074536027 +08 08 03.459408149 8.46 6.93 5.36     M4.5:III 121 0
17 Cl Collinder 261 OpC 12 38 04.7 -68 22 40     10.7     ~ 216 0
18 * 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 2417 1
19 V* RX Boo AB* 14 24 11.6253191184 +25 42 13.394221596   9.23 8.60     M7.5-M8 457 0
20 [SDD2014] 31b RG* 15 38 54.032 -50 00 17.88     17.50   15.20 ~ 1 0
21 [SDD2014] 40a * 15 38 54.389 -50 01 36.20     18.84   17.03 ~ 1 0
22 [SDD2014] 33b * 15 38 54.725 -50 01 59.90     18.75   16.93 ~ 1 0
23 [SDD2014] 41a * 15 38 55.168 -50 04 51.98     18.10   15.77 ~ 1 0
24 [SDD2014] 34b * 15 38 55.435 -50 04 19.50     18.40   16.43 ~ 1 0
25 [SDD2014] 30a RG* 15 38 55.819 -50 01 09.80     17.72   15.25 ~ 2 0
26 [SDD2014] 35b * 15 38 56.078 -50 02 42.50     18.78   16.95 ~ 1 0
27 [SDD2014] 38b * 15 38 56.585 -50 05 06.38     18.22   15.82 ~ 1 0
28 [SDD2014] 24a RG* 15 38 56.585 -50 05 06.38     18.22   15.82 ~ 1 0
29 [SDD2014] 29a * 15 38 57.099 -50 02 48.90     17.96   15.89 ~ 1 0
30 [SDD2014] 36b * 15 38 57.308 -50 02 59.60     18.91   17.00 ~ 1 0
31 [SDD2014] 32b * 15 38 58.105 -50 01 33.20     18.62   16.67 ~ 1 0
32 [SDD2014] 28a * 15 38 58.105 -50 01 33.20     18.62   16.67 ~ 1 0
33 [SDD2014] 37b * 15 38 59.348 -50 03 48.40     18.68   16.79 ~ 1 0
34 [SDD2014] 33a * 15 38 59.419 -50 01 52.40     18.79   16.88 ~ 1 0
35 [SDD2014] 37a RG* 15 38 59.908 -50 04 13.70     17.38   15.24 ~ 1 0
36 [SDD2014] 39b RG* 15 38 59.908 -50 04 13.70     17.38   15.24 ~ 1 0
37 [SDD2014] 28b RG* 15 39 00.5743685808 -50 03 36.058195008     18.01   15.99 ~ 2 0
38 [SDD2014] 27a * 15 39 00.618 -50 03 30.10     18.81   17.02 ~ 1 0
39 [SDD2014] 29b * 15 39 01.008 -50 04 11.73     18.90   17.11 ~ 1 0
40 [SDD2014] 38a * 15 39 01.375 -50 01 52.31     18.86   16.93 ~ 1 0
41 [SDD2014] 27b RG* 15 39 01.749 -50 03 07.13     17.81   15.64 ~ 1 0
42 [SDD2014] 31a * 15 39 01.959 -50 03 43.43     17.50   15.37 ~ 1 0
43 [SDD2014] 36a RG* 15 39 02.478 -50 04 59.10     17.94   15.71 ~ 1 0
44 [SDD2014] 30b * 15 39 02.498 -50 02 48.63     18.79   16.97 ~ 1 0
45 [SDD2014] 26a * 15 39 03.110 -50 03 03.94     19.29   18.00 ~ 1 0
46 [SDD2014] 25b * 15 39 03.160 -50 02 43.10     18.78   17.34 ~ 1 0
47 [SDD2014] 24b * 15 39 03.749 -50 03 49.83     18.82   16.77 ~ 2 0
48 [SDD2014] 32a RG* 15 39 03.929 -50 02 51.70     18.02   15.84 ~ 1 0
49 [SDD2014] 26b * 15 39 04.718 -50 04 42.71     18.60   16.71 ~ 1 0
50 [SDD2014] 34a * 15 39 04.908 -50 01 46.80     18.76   16.87 ~ 1 0
51 [SDD2014] 13b RG* 15 39 05.295 -50 02 43.73     17.90   15.60 ~ 2 0
52 [SDD2014] 39a * 15 39 05.318 -50 02 37.23     18.99   17.09 ~ 1 0
53 ESO 224-8 OpC 15 39 05.4 -50 03 02           ~ 77 0
54 [SDD2014] 21b RG* 15 39 05.778 -50 03 12.70     17.58   15.26 ~ 1 0
55 [SDD2014] 25a RG* 15 39 05.899 -50 03 26.43     18.23   16.01 ~ 1 0
56 [SDD2014] 14b * 15 39 06.378 -50 02 55.30     18.80   16.94 ~ 1 0
57 [SDD2014] 35a * 15 39 06.535 -50 01 38.41     18.65   16.60 ~ 1 0
58 [SDD2014] 11b LP* 15 39 06.9616102950 -50 02 55.023687866     18.37   14.03 ~ 2 0
59 [SDD2014] 13a * 15 39 06.999 -50 03 16.63     18.77   16.80 ~ 1 0
60 [SDD2014] 12b * 15 39 07.409 -50 03 35.83     18.81   16.87 ~ 1 0
61 [SDD2014] 12a * 15 39 07.829 -50 03 10.43     17.41   13.87 ~ 3 2
62 [SDD2014] 8b * 15 39 08.309 -50 03 34.81     18.61   16.76 ~ 1 0
63 [SDD2014] 11a * 15 39 08.698 -50 03 04.50     18.58   16.74 ~ 1 0
64 [SDD2014] 15b RG* 15 39 09.150 -50 02 20.70     17.73   15.57 ~ 1 0
65 [SDD2014] 14a * 15 39 09.249 -50 02 50.23     18.65   16.73 ~ 1 0
66 [SDD2014] 22b * 15 39 09.579 -50 02 50.73     18.69   16.77 ~ 1 0
67 Cl* VDBH 176 FMP 8251 * 15 39 10.060 -50 02 22.50     18.77   16.91 ~ 2 0
68 [SDD2014] 21a * 15 39 10.609 -50 02 27.41     18.78   16.91 ~ 1 0
69 [SDD2014] 9b LP* 15 39 10.7070346684 -50 03 05.130932595     19.29   14.30 ~ 2 0
70 [SDD2014] 10a * 15 39 11.242 -50 03 14.81     18.65   16.74 ~ 1 0
71 [SDD2014] 10b * 15 39 11.258 -50 03 10.40     18.79   16.95 ~ 1 0
72 [SDD2014] 7b * 15 39 11.878 -50 04 14.78     19.05   16.95 ~ 1 0
73 [SDD2014] 8a * 15 39 12.019 -50 02 47.41     18.45   16.60 ~ 1 0
74 [SDD2014] 16b * 15 39 12.478 -50 04 15.20     18.56   16.57 ~ 2 0
75 [SDD2014] 18a RG* 15 39 12.6774123072 -50 01 59.911486680     17.95   15.67 ~ 3 0
76 [SDD2014] 15a RG* 15 39 13.199 -50 03 35.23     17.57   15.34 ~ 1 0
77 [SDD2014] 20b * 15 39 13.592 -50 02 58.73     18.99   17.04 ~ 1 0
78 [SDD2014] 19a * 15 39 13.732 -50 03 34.03     18.52   16.47 ~ 1 0
79 [SDD2014] 17b * 15 39 14.059 -50 03 24.86     18.92   17.06 ~ 1 0
80 [SDD2014] 19b RG* 15 39 14.615 -50 02 20.81     18.49   16.38 ~ 1 0
81 [SDD2014] 17a * 15 39 14.725 -50 00 41.88     19.11   17.11 ~ 1 0
82 [SDD2014] 18b RG* 15 39 15.089 -50 03 08.03     18.43   16.34 ~ 1 0
83 [SDD2014] 9a * 15 39 15.627 -50 02 36.85     17.41   15.97 ~ 1 0
84 [SDD2014] 23b * 15 39 16.369 -50 02 49.33     18.74   16.89 ~ 1 0
85 [SDD2014] 20a * 15 39 16.379 -50 03 09.73     18.92   16.87 ~ 1 0
86 [SDD2014] 16a * 15 39 17.168 -50 04 18.90     19.05   17.13 ~ 1 0
87 [SDD2014] 6b RG* 15 39 17.452 -50 01 20.81     16.74   14.50 ~ 1 0
88 [SDD2014] 23a * 15 39 17.685 -50 01 08.08     17.79   15.80 ~ 1 0
89 [SDD2014] 5b * 15 39 18.223 -50 03 39.70     18.02   16.66 ~ 1 0
90 [SDD2014] 7a * 15 39 18.376 -50 04 47.50     18.55   16.98 ~ 1 0
91 [SDD2014] 4b * 15 39 19.549 -50 03 16.51     18.94   17.03 ~ 1 0
92 [SDD2014] 5a RG* 15 39 20.099 -50 02 37.23     16.99   14.62 ~ 1 0
93 [SDD2014] 3b * 15 39 20.448 -50 01 13.30     18.30   16.36 ~ 1 0
94 [SDD2014] 6a * 15 39 20.685 -50 00 08.75     18.37   16.49 ~ 1 0
95 [SDD2014] 1b * 15 39 22.310 -50 02 46.22     17.71   15.67 ~ 1 0
96 [SDD2014] 3a * 15 39 22.4911392864 -50 01 15.442863276     17.91   16.33 ~ 1 0
97 [SDD2014] 4a * 15 39 23.0148621408 -50 00 38.186960652     18.26   16.76 ~ 1 0
98 [SDD2014] 1a RG* 15 39 23.835 -50 04 18.53     18.06   15.99 ~ 1 0
99 [SDD2014] 2a * 15 39 24.756 -50 03 31.22     18.60   17.02 ~ 1 0
100 [SDD2014] 2b * 15 39 25.082 -50 01 04.15     18.96   17.03 ~ 1 0
101 NGC 6253 OpC 16 59 06.4 -52 42 39     10.2     ~ 209 0
102 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
103 V* V988 Oph AB* 18 26 52.8363330600 +03 54 49.217099256   9.45 7.93     M5/6III 27 0
104 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2438 2
105 GCl 111 GlC 19 18 02.10 +18 34 18.0           ~ 138 0
106 NGC 6791 OpC 19 20 52.8 +37 46 40   10.52 9.5     ~ 1120 0
107 * mu. Aql PM* 19 34 05.3529921054 +07 22 44.184329526 6.87 5.63 4.45 3.55 2.94 K3-IIIbFe0.5 272 1
108 NGC 6946 H2G 20 34 52.332 +60 09 13.24   10.5       ~ 2661 2
109 V* FF Aqr EB* 22 00 36.4255860432 -02 44 26.868642108   10.23 9.408   8.245 G8III+sdO 122 0
110 LP 877-23 PM* 22 52 41.0353986762 -20 35 32.994432457   13.02 11.90     ~ 119 0
111 NAME Monoceros Stream St* ~ ~           ~ 374 1
112 NAME Galactic Bulge reg ~ ~           ~ 4794 0

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