2008AJ....136.2321H

Query : 2008AJ....136.2321H

2008AJ....136.2321H - Astron. J., 136, 2321-2331 (2008/December-0)

The age and metallicity of the Bootes I system.

HUGHES J., WALLERSTEIN G. and BOSSI A.

Abstract (from CDS):

We present Washington CT1T2 photometry of a field central to the Boötes I dwarf spheroidal galaxy, which was discovered as a stellar overdensity in the Sloan Digital Sky Survey (DR5). We show that the Washington filters are much more effective than the Sloan filters in separating the metal-poor turn-off stars in the dwarf galaxy from the foreground stars. We detect 165 objects in the field, and statistically determine that just over 40% of the objects are nonmembers. Our statistical analysis mostly agrees with radial velocity measurements of the brighter stars. We find that there is a distinct main-sequence turn-off and subgiant branch, where there is some evidence of a spread in chemical abundance. Any evidence of an age spread is limited to a few billion years. The brightest seven Boötes I members give a (photometric-color derived) weighted mean iron abundance of [Fe/H] = -2.1+0.3–0.5, and the best-fit isochrone is the 14.1 Gyr, Z = 0.0002 model, with (m - M)V = 19.11 and E(B - V) = 0.02.

Abstract Copyright: ∼

Journal keyword(s): galaxies: dwarf - galaxies: individual: Bootes I - Local Group

VizieR on-line data: <Available at CDS (J/AJ/136/2321): table2.dat>

Nomenclature: Table 2: [HWB2008] NNN (Nos 1-165).

Simbad objects: 185

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Number of rows : 185
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 Cl Melotte 71 OpC 07 37 31.3 -12 03 42   7.44 7.1     ~ 149 0
2 NAME UMa II Galaxy G 08 51 30.0 +63 07 48     13.3     ~ 410 0
3 NAME Leo T G 09 34 53.4 +17 03 05     15.1     ~ 434 0
4 SA 101- reg 09 57 28.2 -00 19 39           ~ 74 0
5 NAME Segue 1 G 10 07 03.2 +16 04 25     15.3     ~ 517 1
6 NAME Willman 1 G 10 49 21.0 +51 03 00     15.2     ~ 345 0
7 NAME UMa Region reg 11 00 +50.0           ~ 333 0
8 NAME Leo IV LSB 11 32 57.0 -00 32 00     15.1     ~ 419 1
9 NAME Coma Dwarf Galaxy G 12 26 59.0 +23 54 15     14.1     ~ 482 1
10 NAME CVn II dSph G 12 57 09.6 +34 19 12     16.1     ~ 287 2
11 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3677 0
12 NAME CVn I dSph G 13 28 03.5 +33 33 21     13.1     ~ 352 1
13 NAME Bootes II G 13 58 00.0 +12 51 00     15.4     ~ 269 0
14 [HWB2008] 62 * 13 59 57.32 +14 30 15.3           ~ 2 0
15 [HWB2008] 53 * 13 59 57.36 +14 31 15.5           ~ 2 0
16 [HWB2008] 65 * 13 59 57.42 +14 30 14.9           ~ 2 0
17 [HWB2008] 133 * 13 59 57.55 +14 30 56.7           ~ 1 0
18 [HWB2008] 21 * 13 59 57.6027242664 +14 27 35.711629704           ~ 2 0
19 [HWB2008] 129 * 13 59 57.63 +14 31 28.2           ~ 1 0
20 SDSS J135957.68+142955.4 PM* 13 59 57.7021328681 +14 29 55.461818972           ~ 4 0
21 [HWB2008] 56 * 13 59 57.72 +14 29 21.0           ~ 2 0
22 [HWB2008] 69 * 13 59 57.73 +14 28 10.2           ~ 2 0
23 [HWB2008] 75 * 13 59 57.74 +14 32 03.2           ~ 2 0
24 [HWB2008] 61 * 13 59 57.75 +14 31 07.9           ~ 2 0
25 [HWB2008] 102 * 13 59 57.81 +14 28 11.8           ~ 2 0
26 [HWB2008] 68 * 13 59 57.82 +14 28 18.0           ~ 2 0
27 [HWB2008] 127 * 13 59 57.84 +14 32 13.8           ~ 1 0
28 SDSS J135957.85+142802.5 * 13 59 57.8477533968 +14 28 02.556579900           ~ 6 0
29 [HWB2008] 44 * 13 59 57.97 +14 29 37.3           ~ 2 0
30 [HWB2008] 103 * 13 59 58.00 +14 29 51.8           ~ 1 0
31 [HWB2008] 37 * 13 59 58.36 +14 31 39.0           ~ 2 0
32 [HWB2008] 42 * 13 59 58.51 +14 30 58.8           ~ 2 0
33 [HWB2008] 58 * 13 59 58.68 +14 28 34.4           ~ 1 0
34 [HWB2008] 112 * 13 59 58.68 +14 29 54.5           ~ 2 0
35 [HWB2008] 148 * 13 59 58.74 +14 29 25.2           ~ 2 0
36 [HWB2008] 132 * 13 59 58.87 +14 28 21.1           ~ 2 0
37 [HWB2008] 140 * 13 59 58.95 +14 30 37.6           ~ 2 0
38 2MASS J13595900+1431317 * 13 59 59.0012188536 +14 31 31.609225812           ~ 2 0
39 [HWB2008] 72 * 13 59 59.19 +14 29 30.2           ~ 2 0
40 [HWB2008] 104 * 13 59 59.26 +14 28 50.0           ~ 1 0
41 [HWB2008] 124 * 13 59 59.58 +14 31 56.3           ~ 2 0
42 [HWB2008] 88 * 13 59 59.66 +14 30 14.3           ~ 2 0
43 [HWB2008] 33 * 13 59 59.8311375240 +14 27 39.237648984           ~ 2 0
44 [HWB2008] 48 * 13 59 59.91 +14 31 08.8           ~ 2 0
45 NAME Bootes Dwarf Spheroidal Galaxy G 14 00 00.0 +14 30 00     12.8     ~ 491 0
46 [HWB2008] 116 * 14 00 00.07 +14 28 52.7           ~ 2 0
47 [HWB2008] 151 * 14 00 00.23 +14 30 24.5           ~ 1 0
48 [HWB2008] 77 * 14 00 00.40 +14 31 04.8           ~ 2 0
49 [HWB2008] 71 * 14 00 00.60 +14 31 47.0           ~ 2 0
50 [HWB2008] 130 * 14 00 00.62 +14 28 53.7           ~ 1 0
51 [HWB2008] 40 * 14 00 00.992 +14 31 26.71           ~ 3 0
52 [HWB2008] 126 * 14 00 01.07 +14 32 10.3           ~ 1 0
53 [HWB2008] 137 * 14 00 01.23 +14 32 11.2           ~ 1 0
54 [HWB2008] 97 * 14 00 01.54 +14 29 06.8           ~ 1 0
55 [HWB2008] 93 * 14 00 01.67 +14 27 50.6           ~ 2 0
56 [HWB2008] 118 * 14 00 01.97 +14 30 40.5           ~ 2 0
57 [HWB2008] 123 * 14 00 02.13 +14 30 27.0           ~ 2 0
58 [HWB2008] 135 * 14 00 02.15 +14 28 45.2           ~ 1 0
59 [HWB2008] 150 * 14 00 02.36 +14 29 45.5           ~ 1 0
60 [HWB2008] 35 * 14 00 02.42 +14 32 02.6           ~ 2 0
61 [HWB2008] 114 * 14 00 02.42 +14 32 14.5           ~ 1 0
62 [HWB2008] 38 * 14 00 02.50 +14 31 08.3           ~ 2 0
63 [HWB2008] 155 * 14 00 02.76 +14 28 48.7           ~ 2 0
64 [HWB2008] 107 * 14 00 02.82 +14 30 19.9           ~ 2 0
65 [HWB2008] 32 * 14 00 02.8502534088 +14 29 08.450904912           ~ 2 0
66 [HWB2008] 161 * 14 00 02.96 +14 31 19.1           ~ 1 0
67 [HWB2008] 34 * 14 00 03.0708825720 +14 30 23.641561692           ~ 6 0
68 [HWB2008] 149 * 14 00 03.12 +14 28 31.5           ~ 1 0
69 [HWB2008] 60 * 14 00 03.16 +14 29 11.4           ~ 2 0
70 [HWB2008] 47 * 14 00 03.24 +14 31 58.1           ~ 2 0
71 [HWB2008] 30 * 14 00 03.2553164376 +14 29 18.423712248           ~ 2 0
72 SDSS J140003.32+142851.4 Pe* 14 00 03.3286109544 +14 28 51.496221468           ~ 8 0
73 [HWB2008] 128 * 14 00 03.39 +14 30 15.0           ~ 2 0
74 [HWB2008] 39 * 14 00 03.41 +14 31 41.3           ~ 2 0
75 [HWB2008] 51 * 14 00 03.47 +14 31 20.4           ~ 2 0
76 [HWB2008] 159 * 14 00 03.55 +14 30 38.5           ~ 2 0
77 [HWB2008] 36 * 14 00 03.64 +14 31 49.0           ~ 2 0
78 [HWB2008] 110 * 14 00 03.85 +14 29 43.3           ~ 1 0
79 [HWB2008] 41 * 14 00 03.86 +14 31 49.6           ~ 1 0
80 2MASS J14000406+1431251 * 14 00 04.0579365216 +14 31 25.012911180           ~ 2 0
81 SDSS J140004.12+142736.7 * 14 00 04.1199856896 +14 27 36.752379768           ~ 4 0
82 [HWB2008] 63 * 14 00 04.29 +14 32 19.7           ~ 1 0
83 [HWB2008] 89 * 14 00 04.39 +14 29 41.1           ~ 2 0
84 [HWB2008] 94 * 14 00 04.45 +14 29 57.6           ~ 2 0
85 [HWB2008] 125 * 14 00 04.50 +14 31 06.5           ~ 2 0
86 SDSS J140004.61+143128.0 * 14 00 04.5998119416 +14 31 28.238830932           ~ 3 0
87 [HWB2008] 117 * 14 00 04.68 +14 31 35.1           ~ 2 0
88 SDSS J140004.86+143144.2 * 14 00 04.8596266416 +14 31 44.265943056           ~ 3 0
89 [HWB2008] 80 * 14 00 04.88 +14 28 25.2           ~ 2 0
90 [HWB2008] 156 * 14 00 04.99 +14 29 17.7           ~ 1 0
91 [HWB2008] 165 * 14 00 05.11 +14 30 06.1           ~ 1 0
92 [HWB2008] 138 * 14 00 05.11 +14 32 18.9           ~ 1 0
93 SDSS J140005.33+143023.3 * 14 00 05.3327571744 +14 30 23.392504800           ~ 6 0
94 [HWB2008] 119 * 14 00 05.46 +14 31 29.7           ~ 1 0
95 [HWB2008] 45 * 14 00 05.71 +14 29 48.6           ~ 2 0
96 [HWB2008] 14 * 14 00 05.7909435888 +14 28 59.643755616           ~ 2 0
97 [HWB2008] 64 * 14 00 05.89 +14 31 55.9           ~ 2 0
98 [HWB2008] 136 * 14 00 05.94 +14 27 55.7           ~ 2 0
99 [HWB2008] 162 * 14 00 06.17 +14 32 02.2           ~ 1 0
100 [HWB2008] 29 * 14 00 06.3774395352 +14 30 55.738850436           ~ 2 0
101 [HWB2008] 139 * 14 00 06.47 +14 28 42.3           ~ 1 0
102 [HWB2008] 121 * 14 00 06.48 +14 28 59.9           ~ 2 0
103 [HWB2008] 141 * 14 00 06.62 +14 29 20.6           ~ 2 0
104 SDSS J140006.64+142849.5 * 14 00 06.6470151336 +14 28 49.540718460           ~ 3 0
105 [HWB2008] 99 * 14 00 06.74 +14 31 39.4           ~ 2 0
106 [HWB2008] 96 * 14 00 06.92 +14 31 13.2           ~ 2 0
107 [HWB2008] 105 * 14 00 06.95 +14 29 05.6           ~ 2 0
108 SDSS J140006.98+143207.7 * 14 00 06.9782560056 +14 32 07.839708036           ~ 4 0
109 [HWB2008] 164 * 14 00 07.14 +14 31 43.4           ~ 1 0
110 TYC 907-89-1 * 14 00 07.2477312672 +14 30 44.259005484   12.55 11.82     ~ 1 0
111 SDSS J140007.34+143151.1 * 14 00 07.3438321920 +14 31 51.110222880           ~ 3 0
112 [HWB2008] 46 * 14 00 07.48 +14 28 09.8           ~ 2 0
113 [HWB2008] 146 * 14 00 07.54 +14 31 26.3           ~ 1 0
114 [HWB2008] 70 * 14 00 08.03 +14 32 07.0           ~ 1 0
115 [HWB2008] 106 * 14 00 08.13 +14 29 55.5           ~ 2 0
116 [HWB2008] 120 * 14 00 08.28 +14 28 36.3           ~ 2 0
117 [HWB2008] 87 * 14 00 08.38 +14 27 51.2           ~ 2 0
118 2MASS J14000844+1429296 * 14 00 08.4365737536 +14 29 29.652342072           ~ 2 0
119 [HWB2008] 154 * 14 00 08.45 +14 31 51.1           ~ 1 0
120 [HWB2008] 113 * 14 00 08.50 +14 31 46.0           ~ 1 0
121 [HWB2008] 131 * 14 00 08.53 +14 29 15.3           ~ 2 0
122 [HWB2008] 91 * 14 00 08.78 +14 28 47.1           ~ 2 0
123 [HWB2008] 157 * 14 00 08.95 +14 29 12.2           ~ 1 0
124 [HWB2008] 81 * 14 00 09.07 +14 31 54.0           ~ 2 0
125 [HWB2008] 49 * 14 00 09.26 +14 29 24.6           ~ 2 0
126 [HWB2008] 109 * 14 00 09.62 +14 31 33.7           ~ 2 0
127 [HWB2008] 144 * 14 00 09.63 +14 29 18.5           ~ 1 0
128 [HWB2008] 67 * 14 00 09.64 +14 29 17.6           ~ 2 0
129 [HWB2008] 84 * 14 00 09.78 +14 29 59.3           ~ 2 0
130 2MASS J14000985+1428228 * 14 00 09.8519784912 +14 28 22.997618256           ~ 15 0
131 SDSS J140009.88+143052.0 * 14 00 09.8785002240 +14 30 52.107856092           ~ 3 0
132 [HWB2008] 92 * 14 00 10.00 +14 31 08.8           ~ 2 0
133 [HWB2008] 82 * 14 00 10.21 +14 31 38.8           ~ 2 0
134 [HWB2008] 98 * 14 00 10.22 +14 28 43.2           ~ 2 0
135 [HWB2008] 158 * 14 00 10.23 +14 30 49.0           ~ 2 0
136 2MASS J14001029+1431205 * 14 00 10.2989520792 +14 31 20.407792800           ~ 3 0
137 2MASS J14001049+1431454 RB? 14 00 10.4860038864 +14 31 45.523177176           ~ 20 0
138 SDSS J140010.69+142924.4 Pe* 14 00 10.6973390664 +14 29 24.439930116           ~ 5 0
139 [HWB2008] 95 * 14 00 10.81 +14 28 09.7           ~ 2 0
140 [HWB2008] 111 * 14 00 10.84 +14 29 57.8           ~ 1 0
141 [HWB2008] 163 * 14 00 11.03 +14 29 45.1           ~ 2 0
142 [HWB2008] 74 * 14 00 11.37 +14 32 15.5           ~ 1 0
143 [HWB2008] 145 * 14 00 11.38 +14 31 50.8           ~ 1 0
144 [HWB2008] 83 * 14 00 11.55 +14 30 54.7           ~ 2 0
145 [HWB2008] 101 * 14 00 11.61 +14 27 36.0           ~ 2 0
146 [HWB2008] 160 * 14 00 11.68 +14 32 09.7           ~ 1 0
147 [HWB2008] 134 * 14 00 11.82 +14 30 00.1           ~ 1 0
148 [HWB2008] 85 * 14 00 11.89 +14 31 16.7           ~ 2 0
149 [HWB2008] 55 * 14 00 12.04 +14 30 31.0           ~ 1 0
150 [HWB2008] 31 * 14 00 12.2334555120 +14 29 22.022692692           ~ 3 0
151 2MASS J14001226+1431518 * 14 00 12.2491875528 +14 31 51.961472580           F2V 5 0
152 [HWB2008] 90 * 14 00 12.35 +14 29 41.2           ~ 2 0
153 [HWB2008] 143 * 14 00 12.35 +14 29 49.8           ~ 1 0
154 [HWB2008] 152 * 14 00 12.42 +14 31 44.8           ~ 1 0
155 [HWB2008] 59 * 14 00 12.60 +14 30 24.5           ~ 2 0
156 [HWB2008] 100 * 14 00 12.72 +14 28 55.3           ~ 2 0
157 [HWB2008] 122 * 14 00 12.79 +14 29 43.1           ~ 2 0
158 [HWB2008] 18 * 14 00 12.9575126424 +14 30 47.186895780           ~ 2 0
159 [HWB2008] 78 * 14 00 13.34 +14 29 30.5           ~ 2 0
160 [HWB2008] 73 * 14 00 13.37 +14 28 53.2           ~ 2 0
161 [HWB2008] 54 * 14 00 13.40 +14 31 16.7           ~ 2 0
162 [HWB2008] 57 * 14 00 13.55 +14 28 34.7           ~ 2 0
163 [HWB2008] 52 * 14 00 13.61 +14 30 37.4           ~ 2 0
164 [HWB2008] 115 * 14 00 13.91 +14 30 51.3           ~ 2 0
165 [HWB2008] 50 * 14 00 14.56 +14 30 06.1           ~ 2 0
166 [HWB2008] 86 * 14 00 14.77 +14 31 16.1           ~ 2 0
167 [HWB2008] 76 * 14 00 14.77 +14 31 18.9           ~ 2 0
168 SDSS J140014.84+142909.6 * 14 00 14.8471685424 +14 29 09.608543664           ~ 4 0
169 [HWB2008] 79 * 14 00 15.13 +14 27 55.0           ~ 2 0
170 SDSS J140015.18+142749.7 * 14 00 15.1692360504 +14 27 49.883376528           ~ 4 0
171 [HWB2008] 108 * 14 00 15.49 +14 30 22.6           ~ 2 0
172 [HWB2008] 66 * 14 00 15.58 +14 27 56.8           ~ 2 0
173 [HWB2008] 153 * 14 00 15.75 +14 30 40.2           ~ 1 0
174 SDSS J140015.96+143024.8 * 14 00 15.9609990864 +14 30 24.926109336           ~ 3 0
175 [HWB2008] 142 * 14 00 16.05 +14 29 27.9           ~ 1 0
176 [HWB2008] 43 * 14 00 16.11 +14 28 02.1           ~ 1 0
177 [HWB2008] 147 * 14 00 16.13 +14 32 18.3           ~ 1 0
178 [HWB2008] 25 * 14 00 16.1545843656 +14 31 47.033787144           ~ 2 0
179 Z 318-18 G 15 09 08.0 +67 13 21   13.60 10.6     ~ 1459 0
180 SA 107- reg 15 39.2 -00 20           ~ 91 0
181 ACO 2151 ClG 16 05 15.0 +17 44 55           ~ 594 3
182 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 2240 0
183 NGC 6388 GlC 17 36 17.461 -44 44 08.34           ~ 988 1
184 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3274 0
185 NAME Local Group GrG ~ ~           ~ 9325 0

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