1995A&AS..111...85V

Query : 1995A&AS..111...85V

1995A&AS..111...85V - Astron. Astrophys., Suppl. Ser., 111, 85-94 (1995/May-2)

A detailed study of the open cluster Pismis 20.

VAZQUEZ R.A., WILL J.-M., PRADO P. and FEINSTEIN A.

Abstract (from CDS):

The very young open cluster Pis 20 has been investigated using CCD UBVR photometry. New blue faint members were found down to V=19mag. With them we obtain a better definition of the lower cluster main sequence. Using the fitting method, we derive a cluster distance of d=3600pc (V0-MV=12.80). The mean color excess is <EB–V≥1.24mag. From the observed characteristics and spatial location of the bluest cluster stars we conclude that the star WR 67 has a good chance to be a cluster member. In that case, the mass of its progenitor should be greater than 50M☉ according to evolutionary models. We obtain for Pis 20 an age of 5(±1)x106yr from isochrone fitting. We discuss the cluster's mass spectrum whose slope, within the observational uncertainties, appears to be similar to the one in Salpeter's law. We notice that high WR/OB and WC/WN number ratios are present not only within the cluster itself but also in the association where Pis 20 is situated. Although the cluster distance derived here places Pis 20 nearer than the supernova remnant MSH 15-52, we cannot/rule out the possibility that they are spatially related. The presently observed cluster mass is around 600M☉.

Abstract Copyright: ∼

Journal keyword(s): open cluster: Pis 20 (C 1511-588) - stars: mass function - stars: WR - individual: WR 67

VizieR on-line data: <Available at CDS (J/A+AS/111/85): table2 table5>

Nomenclature: Table 2: Cl* Pismis 20 VWP NNN N=196

CDS comments: MSH 15-22 misprint for MSH 15-52

Simbad objects: 204

goto View the references in ADS

Number of rows : 204
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 5606 OpC 14 27 49.7 -59 37 45           ~ 109 0
2 3A 1510-590 Psr 15 13 17.000 -59 04 54.00           ~ 434 3
3 SNR G320.4-01.0 SNR 15 13 35 -59 00.2           ~ 87 0
4 PSR B1509-58 Psr 15 13 47.6 -59 07 54     13.06     ~ 879 1
5 Cl Pismis 20 13 * 15 15 15.7237442760 -59 04 48.442337004 11.95 12.19 11.24 11.03   O7 22 0
6 Cl Pismis 20 1 * 15 15 19.5653213568 -59 03 24.176615904 13.55 13.65 12.65     ~ 16 0
7 Cl Pismis 20 12 * 15 15 20.2738340623 -59 03 48.599715440 15.15 15.18 14.20 13.859   ~ 12 0
8 Cl Pismis 20 10 * 15 15 20.3555532672 -59 04 31.270571112 13.59 13.78 12.94     ~ 11 0
9 Cl Pismis 20 2 * 15 15 22.0691635920 -59 03 45.526077036   13.46 12.48     O8.5I 10 0
10 Cl Pismis 20 9 * 15 15 22.3299044808 -59 04 30.843484932 12.13 12.28 13.43     O9III 13 0
11 Cl Pismis 20 11 * 15 15 22.3544327880 -59 04 17.409996192 11.51 11.67 10.73     B0Ib 20 0
12 Cl Pismis 20 OpC 15 15 23.5 -59 04 23   8.69 7.8     ~ 103 0
13 CPD-58 5866C * 15 15 23.5656897936 -59 03 58.957613496 12.75 12.88 11.94     ~ 13 0
14 Cl Pismis 20 7 * 15 15 23.7717207539 -59 04 17.069695433 10.99 11.46 10.54     B1Ib/II 24 0
15 HD 134959 s*b 15 15 24.0871041696 -59 04 29.296677756 9.05 9.14 8.10 8.642   B2Ia 83 0
16 Cl Pismis 20 6 * 15 15 26.4707680151 -59 04 09.929362072 12.51 11.987 11.019 11.551   O9.5III 15 0
17 Cl Pismis 20 5 * 15 15 26.6849703653 -59 04 05.303428472 12.71 12.74 11.86     B0III 11 0
18 Cl Pismis 20 4 * 15 15 30.9459668184 -59 03 50.251497012   13.57 12.90     ~ 8 0
19 MR 55 WR* 15 15 32.6272277376 -59 02 30.695283672 12.46 12.56 11.84 11.63   WN6-w 72 0
20 Cl* Pismis 20 MV 12 * 15 15 34.15 -59 02 29.4   13.93 13.40     ~ 6 0
21 BBW 28802 HII 15 16 -58.8           ~ 4 0
22 GAL 320.5-01.4 HII 15 16 -59.2           ~ 3 0
23 Cl* Pismis 20 VWP 41 * ~ ~   20.02 18.64     ~ 1 0
24 Cl* Pismis 20 PPM 178 * ~ ~   18.11 16.87     ~ 3 0
25 Cl* Pismis 20 PPM 177 * ~ ~   19.02 17.66     ~ 3 0
26 Cl* Pismis 20 PPM 171 * ~ ~   16.31 15.32     ~ 2 0
27 Cl* Pismis 20 PPM 174 * ~ ~   18.75 17.25     ~ 3 0
28 Cl* Pismis 20 PPM 170 * ~ ~   17.47 16.37     ~ 3 0
29 Cl* Pismis 20 PPM 167 * ~ ~   17.74 16.64     ~ 3 0
30 Cl* Pismis 20 PPM 168 * ~ ~   16.92 15.87     ~ 3 0
31 Cl* Pismis 20 PPM 166 * ~ ~   17.39 16.36     ~ 3 0
32 Cl* Pismis 20 VWP 50 * ~ ~   18.83 17.73     ~ 1 0
33 Cl* Pismis 20 PPM 169 * ~ ~   16.62 15.66     ~ 3 0
34 Cl* Pismis 20 PPM 165 * ~ ~   16.62 15.60     ~ 3 0
35 Cl* Pismis 20 PPM 163 * ~ ~   17.69 16.47     ~ 3 0
36 Cl* Pismis 20 SMD 55 * ~ ~   18.96 17.91     ~ 2 0
37 Cl* Pismis 20 PPM 164 * ~ ~   17.58 16.48     ~ 3 0
38 Cl* Pismis 20 PPM 161 * ~ ~   17.08 16.09     ~ 3 0
39 Cl* Pismis 20 SMD 58 * ~ ~   19.67 18.09     ~ 2 0
40 Cl* Pismis 20 PPM 160 * ~ ~   16.21 15.18     ~ 3 0
41 Cl* Pismis 20 SMD 60 * ~ ~   19.49 17.91     ~ 2 0
42 Cl* Pismis 20 SMD 61 * ~ ~   19.01 17.77     ~ 2 0
43 Cl* Pismis 20 SMD 62 * ~ ~   20.16 17.75     ~ 2 0
44 Cl* Pismis 20 SMD 63 * ~ ~   18.74 17.41     ~ 2 0
45 Cl* Pismis 20 PPM 158 * ~ ~   18.90 17.28     ~ 3 0
46 Cl* Pismis 20 PPM 156 * ~ ~   18.49 17.24     ~ 3 0
47 Cl* Pismis 20 VWP 66 * ~ ~   18.95 17.62     ~ 1 0
48 Cl* Pismis 20 PPM 152 * ~ ~   18.35 16.36     ~ 2 0
49 Cl* Pismis 20 PPM 153 * ~ ~   18.59 17.23     ~ 3 0
50 Cl* Pismis 20 PPM 149 * ~ ~   16.84 15.91     ~ 2 0
51 Cl* Pismis 20 SMD 70 * ~ ~   19.47 17.97     ~ 2 0
52 Cl* Pismis 20 PPM 150 * ~ ~   17.60 16.40     ~ 3 0
53 Cl* Pismis 20 SMD 73 * ~ ~   19.32 17.95     ~ 2 0
54 Cl* Pismis 20 PPM 145 * ~ ~   17.20 16.09     ~ 3 0
55 Cl* Pismis 20 PPM 144 * ~ ~   17.44 16.06     ~ 3 0
56 Cl* Pismis 20 PPM 142 * ~ ~   16.75 15.57     ~ 2 0
57 Cl* Pismis 20 SMD 79 * ~ ~   17.75 15.43     ~ 2 0
58 Cl* Pismis 20 SMD 80 * ~ ~   18.70 16.62     ~ 3 0
59 Cl* Pismis 20 PPM 140 * ~ ~   16.99 15.85     ~ 3 0
60 Cl* Pismis 20 PPM 141 * ~ ~   18.22 16.49     ~ 3 0
61 Cl* Pismis 20 SMD 83 * ~ ~   19.34 18.21     ~ 2 0
62 Cl* Pismis 20 VWP 84 * ~ ~   20.30 18.43     ~ 1 0
63 Cl* Pismis 20 VWP 85 * ~ ~   19.79 18.39     ~ 1 0
64 Cl* Pismis 20 PPM 135 * ~ ~   18.21 17.03     ~ 3 0
65 Cl* Pismis 20 PPM 133 * ~ ~   15.66 14.66     ~ 3 0
66 Cl* Pismis 20 PPM 136 * ~ ~   18.11 16.87     ~ 3 0
67 Cl* Pismis 20 PPM 138 * ~ ~   17.63 16.41     ~ 3 0
68 Cl* Pismis 20 VWP 90 * ~ ~   19.77 18.24     ~ 1 0
69 Cl* Pismis 20 SMD 92 * ~ ~   19.80 18.15     ~ 2 0
70 Cl* Pismis 20 SMD 93 * ~ ~   16.56 15.54     ~ 2 0
71 Cl* Pismis 20 PPM 131 * ~ ~   18.49 17.35     ~ 3 0
72 Cl* Pismis 20 VWP 96 * ~ ~   20.25 18.45     ~ 1 0
73 Cl* Pismis 20 SMD 97 * ~ ~   15.29 14.38     ~ 2 0
74 Cl* Pismis 20 PPM 128 * ~ ~   16.68 15.63     ~ 3 0
75 Cl* Pismis 20 PPM 127 * ~ ~   18.70 17.39     ~ 3 0
76 Cl* Pismis 20 SMD 100 * ~ ~   17.46 16.38     ~ 2 0
77 Cl* Pismis 20 PPM 122 * ~ ~   18.39 17.01     ~ 2 0
78 Cl* Pismis 20 PPM 124 * ~ ~   16.03 15.00     ~ 3 0
79 Cl* Pismis 20 VWP 105 * ~ ~   19.88 18.60     ~ 1 0
80 Cl* Pismis 20 PPM 116 * ~ ~   14.99 14.28     ~ 3 0
81 Cl* Pismis 20 SMD 108 * ~ ~   19.50 17.94     ~ 2 0
82 Cl* Pismis 20 VWP 109 * ~ ~   17.50 16.31     ~ 1 0
83 Cl* Pismis 20 PPM 119 * ~ ~   18.05 16.73     ~ 3 0
84 Cl* Pismis 20 PPM 115 * ~ ~   16.80 15.82     ~ 3 0
85 Cl* Pismis 20 PPM 118 * ~ ~   19.01 17.48     ~ 3 0
86 Cl* Pismis 20 SMD 113 * ~ ~   19.44 17.90     ~ 2 0
87 Cl* Pismis 20 PPM 114 * ~ ~   17.14 16.16     ~ 3 0
88 Cl* Pismis 20 VWP 115 * ~ ~   19.58 18.04     ~ 1 0
89 Cl* Pismis 20 SMD 116 * ~ ~   17.27 16.34     ~ 2 0
90 Cl* Pismis 20 VWP 117 * ~ ~   19.15 18.00     ~ 1 0
91 Cl* Pismis 20 VWP 118 * ~ ~   19.62 18.39     ~ 1 0
92 Cl* Pismis 20 PPM 108 * ~ ~   18.66 17.26     ~ 3 0
93 Cl* Pismis 20 SMD 120 * ~ ~   17.00 15.35     ~ 2 0
94 Cl* Pismis 20 PPM 105 * ~ ~   15.52 14.61     ~ 4 0
95 Cl* Pismis 20 VWP 122 * ~ ~   19.75 17.81     ~ 1 0
96 Cl* Pismis 20 PPM 107 * ~ ~   18.03 16.86     ~ 2 0
97 Cl* Pismis 20 VWP 127 * ~ ~   18.59 17.30     ~ 2 0
98 Cl* Pismis 20 PPM 100 * ~ ~   16.80 15.77     ~ 4 0
99 Cl* Pismis 20 PPM 99 * ~ ~   17.44 16.19     ~ 3 0
100 Cl* Pismis 20 PPM 101 * ~ ~   18.79 17.49     ~ 3 0
101 Cl* Pismis 20 PPM 97 * ~ ~   17.14 16.10     ~ 3 0
102 Cl* Pismis 20 PPM 95 * ~ ~   19.04 16.88     ~ 2 0
103 Cl* Pismis 20 SMD 133 * ~ ~   18.86 16.71     ~ 3 0
104 Cl* Pismis 20 VWP 134 * ~ ~   19.59 18.16     ~ 1 0
105 Cl* Pismis 20 PPM 93 * ~ ~   19.08 17.75     ~ 2 0
106 Cl* Pismis 20 SMD 136 * ~ ~   16.40 15.29     ~ 2 0
107 Cl* Pismis 20 PPM 92 * ~ ~   17.36 16.01     ~ 3 0
108 Cl* Pismis 20 PPM 94 * ~ ~   16.84 15.71     ~ 3 0
109 Cl* Pismis 20 SMD 139 * ~ ~   18.93 17.50     ~ 2 0
110 Cl* Pismis 20 PPM 88 * ~ ~   16.93 15.08     ~ 3 0
111 Cl* Pismis 20 PPM 91 * ~ ~   17.78 16.58     ~ 3 0
112 Cl* Pismis 20 VWP 142 * ~ ~   18.08 16.77     ~ 1 0
113 Cl* Pismis 20 VWP 143 * ~ ~   19.01 17.75     ~ 1 0
114 Cl* Pismis 20 PPM 86 * ~ ~   16.72 15.72     ~ 3 0
115 Cl* Pismis 20 SMD 146 * ~ ~   19.38 17.95     ~ 2 0
116 Cl* Pismis 20 VWP 147 * ~ ~   19.77 18.34     ~ 1 0
117 Cl* Pismis 20 PPM 85 * ~ ~   16.53 15.44     ~ 4 0
118 Cl* Pismis 20 PPM 84 * ~ ~   19.03 17.27     ~ 3 0
119 Cl* Pismis 20 PPM 83 * ~ ~   17.58 16.57     ~ 3 0
120 Cl* Pismis 20 SMD 151 * ~ ~   20.64 19.11     ~ 2 0
121 Cl* Pismis 20 PPM 82 * ~ ~   17.72 16.61     ~ 3 0
122 Cl* Pismis 20 VWP 153 * ~ ~   19.41 18.11     ~ 1 0
123 Cl* Pismis 20 PPM 77 * ~ ~   19.77 17.55     ~ 2 0
124 Cl* Pismis 20 PPM 76 * ~ ~   18.52 17.12     ~ 3 0
125 Cl* Pismis 20 PPM 80 * ~ ~   18.78 17.50     ~ 3 0
126 Cl* Pismis 20 PPM 72 * ~ ~   18.57 17.18     ~ 2 0
127 Cl* Pismis 20 PPM 79 * ~ ~   18.65 17.28     ~ 3 0
128 Cl* Pismis 20 SMD 159 * ~ ~   19.52 18.45     ~ 2 0
129 Cl* Pismis 20 SMD 160 * ~ ~   19.73 17.56     ~ 2 0
130 Cl* Pismis 20 SMD 161 * ~ ~   18.47 17.26     ~ 2 0
131 Cl* Pismis 20 VWP 162 * ~ ~   19.39 18.34     ~ 1 0
132 Cl* Pismis 20 PPM 73 * ~ ~   17.36 16.28     ~ 3 0
133 Cl* Pismis 20 VWP 164 * ~ ~   20.29 18.87     ~ 1 0
134 Cl* Pismis 20 PPM 75 * ~ ~   18.18 17.05     ~ 3 0
135 Cl* Pismis 20 PPM 74 * ~ ~   17.16 16.06     ~ 3 0
136 Cl* Pismis 20 SMD 167 * ~ ~   18.85 17.54     ~ 2 0
137 Cl* Pismis 20 PPM 70 * ~ ~   17.69 16.72     ~ 3 0
138 Cl* Pismis 20 PPM 68 * ~ ~   17.12 16.01     ~ 3 0
139 Cl* Pismis 20 PPM 67 * ~ ~   17.28 16.24     ~ 2 0
140 Cl* Pismis 20 PPM 69 * ~ ~   17.51 16.44     ~ 3 0
141 Cl* Pismis 20 VWP 172 * ~ ~   20.06 18.60     ~ 1 0
142 Cl* Pismis 20 PPM 66 * ~ ~   18.23 16.15     ~ 2 0
143 Cl* Pismis 20 PPM 63 * ~ ~   15.20 14.49     ~ 2 0
144 Cl* Pismis 20 PPM 64 * ~ ~   17.43 16.45     ~ 2 0
145 Cl* Pismis 20 PPM 61 * ~ ~   17.63 16.41     ~ 2 0
146 Cl* Pismis 20 VWP 177 * ~ ~   16.81 15.88     ~ 2 0
147 Cl* Pismis 20 PPM 60 * ~ ~   18.49 17.07     ~ 2 0
148 Cl* Pismis 20 PPM 59 * ~ ~   18.89 17.46     ~ 2 0
149 Cl* Pismis 20 VWP 180 * ~ ~   20.89 19.71     ~ 1 0
150 Cl* Pismis 20 PPM 55 * ~ ~   17.92 16.78     ~ 2 0
151 Cl* Pismis 20 PPM 58 * ~ ~   16.36 15.38     ~ 3 0
152 Cl* Pismis 20 PPM 52 * ~ ~   16.99 16.19     ~ 3 0
153 Cl* Pismis 20 VWP 184 * ~ ~   19.30 18.12     ~ 1 0
154 Cl* Pismis 20 PPM 53 * ~ ~   16.80 15.79     ~ 2 0
155 Cl* Pismis 20 VWP 186 * ~ ~   19.43 17.46     ~ 1 0
156 Cl* Pismis 20 PPM 51 * ~ ~   18.83 17.40     ~ 2 0
157 Cl* Pismis 20 PPM 49 * ~ ~   18.14 16.24     ~ 2 0
158 Cl* Pismis 20 PPM 50 * ~ ~   18.78 17.50     ~ 2 0
159 Cl* Pismis 20 VWP 190 * ~ ~   20.18 18.29     ~ 1 0
160 Cl* Pismis 20 PPM 47 * ~ ~   19.11 17.01     ~ 2 0
161 Cl* Pismis 20 PPM 44 * ~ ~   17.60 15.43     ~ 2 0
162 Cl* Pismis 20 PPM 46 * ~ ~   18.92 16.72     ~ 2 0
163 Cl* Pismis 20 PPM 42 * ~ ~   19.50 17.29     ~ 2 0
164 Cl* Pismis 20 PPM 41 * ~ ~   17.45 16.23     ~ 2 0
165 Cl* Pismis 20 VWP 196 * ~ ~   17.60 16.59     ~ 1 0
166 MSH 15-2-02 Rad ~ ~           ~ 1 0
167 Cl* Pismis 20 VWP 1 * ~ ~   19.92 18.43     ~ 1 0
168 Cl* Pismis 20 PPM 218 * ~ ~   17.81 16.49     ~ 2 0
169 Cl* Pismis 20 PPM 216 * ~ ~   18.92 17.53     ~ 2 0
170 Cl* Pismis 20 VWP 4 * ~ ~   19.94 18.36     ~ 1 0
171 Cl* Pismis 20 VWP 5 * ~ ~   19.26 17.60     ~ 1 0
172 Cl* Pismis 20 VWP 6 * ~ ~   19.63 17.95     ~ 1 0
173 Cl* Pismis 20 PPM 212 * ~ ~   17.52 16.27     ~ 2 0
174 Cl* Pismis 20 PPM 199 * ~ ~   16.99 16.02     ~ 2 0
175 Cl* Pismis 20 VWP 9 * ~ ~   19.64 18.26     ~ 1 0
176 Cl* Pismis 20 PPM 210 * ~ ~   17.90 16.29     ~ 2 0
177 Cl* Pismis 20 VWP 11 * ~ ~   20.20 17.82     ~ 1 0
178 Cl* Pismis 20 VWP 12 * ~ ~   19.78 18.20     ~ 1 0
179 Cl* Pismis 20 PPM 209 * ~ ~   19.50 17.75     ~ 2 0
180 Cl* Pismis 20 VWP 16 * ~ ~   18.45 17.06     ~ 1 0
181 Cl* Pismis 20 PPM 202 * ~ ~   18.38 17.27     ~ 2 0
182 Cl* Pismis 20 VWP 18 * ~ ~   19.24 18.05     ~ 1 0
183 Cl* Pismis 20 VWP 8 * ~ ~   19.43 17.85     ~ 1 0
184 Cl* Pismis 20 PPM 201 * ~ ~   18.21 16.86     ~ 2 0
185 Cl* Pismis 20 PPM 200 * ~ ~   19.71 17.16     ~ 2 0
186 Cl* Pismis 20 VWP 22 * ~ ~   20.23 17.84     ~ 1 0
187 Cl* Pismis 20 PPM 197 * ~ ~   16.07 15.11     ~ 2 0
188 Cl* Pismis 20 PPM 194 * ~ ~   18.79 17.45     ~ 2 0
189 Cl* Pismis 20 VWP 25 * ~ ~   17.87 16.86     ~ 1 0
190 Cl* Pismis 20 PPM 195 * ~ ~   18.71 17.29     ~ 2 0
191 Cl* Pismis 20 PPM 190 * ~ ~   19.21 17.02     ~ 2 0
192 Cl* Pismis 20 PPM 191 * ~ ~   16.53 14.88     ~ 2 0
193 Cl* Pismis 20 VWP 29 * ~ ~   19.11 17.81     ~ 1 0
194 Cl* Pismis 20 PPM 187 * ~ ~   15.47 14.65     ~ 3 0
195 Cl* Pismis 20 PPM 188 * ~ ~   18.99 16.56     ~ 2 0
196 Cl* Pismis 20 VWP 32 * ~ ~   18.65 17.40     ~ 2 0
197 Cl* Pismis 20 PPM 184 * ~ ~   19.11 17.06     ~ 2 0
198 Cl* Pismis 20 PPM 181 * ~ ~   18.68 17.46     ~ 2 0
199 Cl* Pismis 20 VWP 35 * ~ ~   19.55 18.09     ~ 1 0
200 Cl* Pismis 20 PPM 180 * ~ ~   18.80 17.60     ~ 2 0
201 Cl* Pismis 20 PPM 179 * ~ ~   18.16 17.07     ~ 3 0
202 Cl* Pismis 20 PPM 183 * ~ ~   18.72 17.51     ~ 2 0
203 Cl* Pismis 20 SMD 39 * ~ ~   20.12 18.60     ~ 2 0
204 Cl* Pismis 20 PPM 176 * ~ ~   18.50 16.26     ~ 2 0

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