1995A&A...294...89H

Query : 1995A&A...294...89H

1995A&A...294...89H - Astronomy and Astrophysics, volume 29489-106 (1995/2-1)

UBVRI photometry and polarimetry of the stars in S252 (NGC 2175). II. Interpretation.

HAIKALA L.K.

Abstract (from CDS):

Photoelectric UBVRI photometry and polarimetry and photographic UBVR photometry have been used to study the stellar cluster NGC 2175 associated with the HII region-molecular cloud complex Sharpless252. The colour excess EB–V of stars in NGC 2175 ranges from the foreground colour excess of 0.4mag up to 1.7mag. The distance modulus of S252 obtained by fitting ZAMS to the colour-magnitude diagrams of NGC 2175 is 11.7±0.3mag (2.2±0.3kpc). The lower part of the colour-magnitude diagrams of the main cluster contains stars still contracting towards ZAMS indicating an age of the order of one million years for the cluster. The age of a small subcluster to the east of the HII region is a few million years. High stellar polarizations up to 12% have been observed. The average wavelength of the maximum polarization in S252 is 0.53±0.01µm and the polarization efficiency is near the empirical maximum value 3Av. The polarization field in S252 is regular but cannot be explained by a single magnetic field direction.

Abstract Copyright: ∼

Journal keyword(s): ISM: individual: S 252 (SH 2-252) - ISM: dust extinction - ISM: clouds - ISM: magnetic fields - open cluster: individual: NGC 2175

Simbad objects: 100

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Number of rows : 100
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 HD 41690 ** 06 07 38.8954269192 +21 52 23.428543224 7.31 7.93 7.71     B1V 74 0
2 HD 252131 V* 06 08 16.5798295056 +20 46 45.728513616   11.03 10.87 11.05   B9 4 0
3 Cl* NGC 2175 H 93 * 06 08 20.2781832912 +20 45 28.851483276   12.40 12.01 12.42   A0.7V 5 0
4 Cl* NGC 2175 H 94 * 06 08 24.1 +20 41 42           A2III 3 0
5 Cl* NGC 2175 H 95 * 06 08 26.3 +20 22 16           B9II 3 0
6 2MASS J06082884+2040216 Y*? 06 08 28.8456701328 +20 40 21.639959688   11.96 12.07 12.06   B4.5V 6 0
7 Cl* NGC 2175 H 96 * 06 08 29.7512010192 +20 28 47.456159016   12.37 11.72 11.52   B7.5IV 5 0
8 Cl* NGC 2175 H 98 V* 06 08 32.00 +20 39 24.0 14.43 14.58 13.7     O9.5V 10 0
9 SH 2-252 A HII 06 08 33 +20 39.3           ~ 75 0
10 Cl* NGC 2175 H 99 EB* 06 08 33.8830189008 +20 46 21.612749664   13.59 13.14 13.07   B6.2V 7 0
11 NGC 2175 100 V* 06 08 35.2811892240 +20 39 24.955072164   12.79 12.49 12.52   B8V 7 0
12 Cl* NGC 2175 H 107 * 06 08 35.9 +20 36 52           B4.5IV-V 3 0
13 NGC 2175 101 V* 06 08 38.0293034760 +20 28 01.145242164   12.83 12.29 12.31   ~ 7 0
14 2MASS J06084301+2030546 Y*? 06 08 43.0137984960 +20 30 54.667140156   12.27 12.15 11.76   B4.5III-IV 8 0
15 2MASS J06084309+2036182 Y*? 06 08 43.0871814216 +20 36 18.386025444           B8.2V 5 0
16 Cl* NGC 2175 H 108 * 06 08 44.8 +20 40 21           B9.2V 3 0
17 Cl* NGC 2175 H 112 * 06 08 49.4 +20 46 42           B1.5V 3 0
18 SH 2-252 B HII 06 08 58 +20 38.5           ~ 19 1
19 HD 252325 Em* 06 09 00.3115263192 +20 38 25.889095968 10.94 11.361 10.758 10.638   O9V(n) 56 1
20 Cl* NGC 2175 H 118 Pe* 06 09 04.6382780592 +20 32 22.489736208   12.05 11.76 11.99   kA3hA6mA8 7 0
21 Cl* NGC 2175 H 120 * 06 09 06.5798736840 +20 39 01.309642992   12.79 12.60 12.73   B8V 4 0
22 NGC 2175 78 * 06 09 09.2097298272 +20 34 14.862431280   13.71 13.25     B4.5IV-V 3 0
23 SH 2-252 F HII 06 09 10 +20 28.4           ~ 7 0
24 NGC 2175 73 * 06 09 11.0406666936 +20 37 13.106724996 15.17 15.02 14.39     B7.2V 6 0
25 Cl* NGC 2175 H 122 * 06 09 11.2 +20 16 55           B9.5V 3 0
26 HD 252382 Pe* 06 09 12.4171934856 +20 26 52.846069668   10.71 10.69     A2V 16 0
27 Cl* NGC 2175 H 123 * 06 09 16.5 +20 16 33           B8.2V 3 0
28 Cl* NGC 2175 H 124 * 06 09 17.0 +20 22 22           ~ 3 0
29 Cl* NGC 2175 H 126 * 06 09 17.6 +20 39 21           B9.2IV 3 0
30 Cl* NGC 2175 H 125 * 06 09 18.4705926816 +20 16 31.613633364   11.93 11.42 11.99   B8IV 5 0
31 LS V +20 17 V* 06 09 19.5857416344 +20 38 20.603436612 11.7 12.09 11.73 11.79   B2.5V 15 0
32 NGC 2175 82 * 06 09 19.9795953072 +20 31 13.433359980   14.64 14.00     B4.7V 7 0
33 Cl* NGC 2175 H 127 * 06 09 21.1 +20 15 12           A0.5V 3 0
34 Cl* NGC 2175 H 132 * 06 09 21.1 +20 40 29           ~ 2 0
35 Cl* NGC 2175 H 129 * 06 09 21.8 +20 22 57           A0.5III-IV 3 0
36 Cl* NGC 2175 H 134 * 06 09 21.9 +20 39 37           O6V 3 0
37 SH 2-252 C HII 06 09 22 +20 39.5           ~ 12 0
38 Cl* NGC 2175 H 133 * 06 09 22.7 +20 28 51           A0IV-V 3 0
39 Cl* NGC 2175 H 131 * 06 09 23.0 +20 23 35           B9V 3 0
40 Cl* NGC 2175 H 136 V* 06 09 23.3042870133 +20 30 58.759543854   12.48 11.74 11.205   ~ 7 0
41 HD 252409 * 06 09 23.3471315376 +20 52 53.967019872   9.728 9.684 9.834   B8 15 0
42 Cl* NGC 2175 H 137 * 06 09 23.6 +20 41 35           ~ 2 0
43 Cl* NGC 2175 H 130 * 06 09 23.7 +20 15 21           ~ 2 0
44 Cl* NGC 2175 H 135 * 06 09 24.2 +20 18 01           B8.5IV-V 3 0
45 NGC 2175 55 * 06 09 24.5360486136 +20 29 14.115708312           B6.5IV-V 3 0
46 NGC 2175 56 * 06 09 24.5768858448 +20 28 38.045890956   13.47 12.79     B6.2IV-V 3 0
47 NGC 2175 54 * 06 09 26.9372314464 +20 28 10.251653844           B7.2V 3 0
48 Cl* NGC 2175 H 138 * 06 09 34.8 +20 40 56           B4.5IV-V 3 0
49 LS V +20 18 Y*? 06 09 36.5082381816 +20 38 11.659224588 11.22 11.66 11.40     OB- 12 0
50 Cl* NGC 2175 H 139 V* 06 09 38.3858187696 +20 39 20.785720752   11.96 11.48 11.47   ~ 11 0
51 NGC 2175 OpC 06 09 39 +20 29.2   7.0 6.8     ~ 270 3
52 HD 42088 * 06 09 39.5728368936 +20 29 15.450599580 6.73 7.58 7.57 8.45   O6V((f))z 257 0
53 Cl* NGC 2175 H 140 V* 06 09 43.39 +20 32 58.9           B0V 4 0
54 Cl* NGC 2175 H 142 V* 06 09 46.1778709080 +20 42 21.854874276   12.30 12.85 12.14   B9 6 0
55 Cl* NGC 2175 H 169 * 06 09 46.8 +20 33 26           B6.2IV 3 0
56 Cl* NGC 2175 H 143 * 06 09 49.3 +20 13 50           B8.2IV-V 3 0
57 HD 252535 Y*? 06 09 50.1358526856 +20 37 05.262347460 9.54 10.26 10.26 10.16   B0.5V 29 1
58 SH 2-252 E HII 06 09 53 +20 30.3           ~ 11 0
59 HD 252558 Y*? 06 09 55.3179448728 +20 38 31.617119544 10.46 10.75 10.6     B4V 19 0
60 Cl* NGC 2175 H 145 * 06 09 56.4878720928 +20 12 53.561793780   12.41 11.60 12.00   A0.5III-IV 5 0
61 Cl* NGC 2175 H 146 * 06 10 01.6 +20 31 31           ~ 2 0
62 Cl* NGC 2175 H 147 * 06 10 02.4 +20 31 02           B7.2V 3 0
63 Cl* NGC 2175 H 148 * 06 10 13.7 +20 24 28           B5IV 3 0
64 Cl* NGC 2175 H 149 * 06 10 17.7 +20 15 16           A2V 3 0
65 Cl* NGC 2175 H 150 * 06 10 24.4543920624 +20 14 55.444392924   12.24 12.08 12.18   A2III 5 0
66 Cl* NGC 2175 H 151 * 06 10 35.5 +20 41 41           B3.5IV 3 0
67 Cl* NGC 2175 H 152 * 06 10 38.6 +20 23 24           B9IV 3 0
68 Cl* NGC 2175 H 154 * 06 10 38.6 +20 30 49           B8.5V 3 0
69 Cl* NGC 2175 H 153 * 06 10 38.7 +20 23 34           B9.7IV 3 0
70 Cl* NGC 2175 H 156 * 06 10 40.0 +20 28 44           ~ 2 0
71 Cl* NGC 2175 H 155 * 06 10 40.6 +20 17 52           ~ 2 0
72 Cl* NGC 2175 H 157 * 06 10 40.7 +20 22 52           ~ 2 0
73 NGC 2175 3 Em* 06 10 48.5379446669 +20 37 15.356185210   13.20 12.79     B5III-IV 13 0
74 Cl* NGC 2175 H 158 * 06 10 48.6 +20 13 12           B9.5V 3 0
75 Cl* NGC 2175 H 159 * 06 10 49.8 +20 25 04           B8IV-V 3 0
76 Cl* NGC 2175 H 160 * 06 10 50.2 +20 28 11           O9.5V 3 0
77 Cl* NGC 2175 H 41 * 06 10 50.7768016848 +20 33 55.134999864           B4.7V 6 0
78 NGC 2175 2 * 06 10 51.1327913664 +20 37 41.668186584 12.83 13.15 12.75     B3IV 8 0
79 HD 252812A V* 06 10 52.8487639656 +20 36 33.649753896 10.35 10.79 10.47 10.296   B3V 17 0
80 NGC 2175 5 V* 06 10 54.5105499024 +20 35 45.193182000   13.731 13.257 13.183   ~ 11 0
81 NGC 2175 15 V* 06 10 55.2356696196 +20 36 11.337846385   13.43 12.87 12.84   B2.5IV 7 0
82 NGC 2175 8 * 06 10 55.9051277040 +20 37 10.265172420   14.06 13.44     B3V 6 0
83 NGC 2175 4 V* 06 10 56.0446282704 +20 36 32.274493452   11.32 10.95 10.82   B0.5V 8 0
84 Cl* NGC 2175 H 161 * 06 10 58.4 +20 14 38           B8.5IV-V 3 0
85 HD 42333 * 06 10 58.6232352336 +20 34 19.613355276 9.35 9.34 9.23     A0 19 0
86 Cl* NGC 2175 H 162 * 06 11 02.8297956288 +20 11 55.887400356   12.24 11.61 12.17   ~ 2 0
87 Cl* NGC 2175 H 32 * 06 11 05.2288475232 +20 35 34.241528148           B4III 5 0
88 NGC 2175 33 V* 06 11 11.9815481496 +20 35 24.727957800   13.08 12.72 12.71   B5III-IV 5 0
89 Cl* NGC 2175 H 163 * 06 11 15.1 +20 36 09           B5V 3 0
90 Cl* NGC 2175 H 164 V* 06 11 16.0805305536 +20 26 50.276193432   12.23 11.70 11.91   ~ 8 0
91 Cl* NGC 2175 H 165 * 06 11 16.464 +20 27 16.59           kA7hF1mF2 4 0
92 HD 42379 s*b 06 11 18.0850174224 +21 33 49.629883824 7.21 7.68 7.43     B1II 70 0
93 Cl* NGC 2175 H 166 V* 06 11 20.3187722465 +20 37 46.036227508   12.27 12.01 12.61   ~ 11 0
94 Cl* NGC 2175 H 168 V* 06 11 22.9458093648 +20 39 21.157603992   12.09 11.32 12.03   ~ 7 0
95 HD 42400 * 06 11 23.1810277656 +20 54 19.492639668 6.52 7.01 6.83     B5II 66 0
96 Cl* NGC 2175 H 167 * 06 11 24.7754358960 +20 16 06.268012140   12.18 11.83 11.66   B6.7III 5 0
97 HD 253049 V* 06 11 42.9182654136 +20 07 36.475040640 9.14 9.854 9.711 9.626   B2IV 31 0
98 HD 253107 * 06 11 54.7766234472 +20 18 25.062787548 9.82 10.41 10.37     B9 19 0
99 HD 253214 Be* 06 12 16.5991274880 +20 05 09.771840996 9.18 9.72 9.54     B2Vnn 44 0
100 HD 42896 bC? 06 14 06.1916006712 +20 10 10.932975336 7.63 8.53 8.62     B1:V:nn 44 0

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