2010A&A...522A..45S


C.D.S. - SIMBAD4 rel 1.7 - 2020.12.02CET12:14:22

2010A&A...522A..45S - Astronomy and Astrophysics, volume 522, A45-45 (2010/11-1)

Photopolarimetric study of the star-forming clouds CB3, CB25, and CB39.

SEN A.K., POLCARO V.F., DEY I. and GUPTA R.

Abstract (from CDS):

The small compact isolated dark clouds also known as ``Bok globules'' are believed to be ideal sites for low-mass star formation. Some of these clouds are undergoing gravitational collapse, and the ambient magnetic field plays a key role in collapse dynamics. The background star polarimetry is generally accepted as a good tool to map the magnetic field, which is responsible for the alignment of dichroic grains that produce polarization. The background star polarization when studied together with extinction is expected to help us to understand various grain properties and the role of polarimetry as a tracer of magnetic field in these star-forming clouds. With this idea, polarization and colour excess E(B-V) values for a set of background stars have been studied together to understand various astrophysical process in some star-forming dark clouds. Optical photometric observations of the three clouds CB3, CB25, and CB39 were carried out at the 2 m H.C. Telescope, India, to determine the colour excess E(B-V) of the background stars by following a technique adopted by Bernabei & Polacaro (2001A&A...371..123B). These three clouds were selected from a set of eight clouds previously observed by us in optical polarimetry (Sen et al., 2000A&AS..141..175S). Further independent spectroscopic measurements of a few selected sample stars were recently carried out during February and March 2010 from 1.52m Cassini Telescope, Loinao, Italy, to confirm the correctness of estimated E(B-V) values obtained by this photometric technique. The colour excess E(B-V) values so obtained were compared with optical polarization values obtained for the same set of stars. It was found that the measured extinction values increase with the increase in percentage polarization for the cloud CB39 and to some extent for CB25. However, for cloud CB31 no such correlation was observed. It is normally expected that the grains causing extinction should also cause polarization of the light from background stars. Any possible deviation from this under different circumstances here has been discussed in the light of the ongoing physical processes in the star-forming clouds.

Abstract Copyright:

Journal keyword(s): dust, extinction - ISM: clouds - stars: formation - techniques: photometric - polarization - techniques: spectroscopic

Simbad objects: 86

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Number of rows : 86

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 [SGR2000] CB 3 22 * 00 28 22.8 +56 42 15   19.22 18.08 17.35   ~ 2 0
2 [SGR2000] CB 3 26 * 00 28 24.5 +56 42 47   15.02 14.40 14.03   ~ 2 0
3 [SGR2000] CB 3 23 * 00 28 28.9 +56 42 34   17.99 17.05 16.53   ~ 2 0
4 [SGR2000] CB 3 31 * 00 28 32.1 +56 44 13   14.45 13.58 13.21   ~ 2 0
5 [SGR2000] CB 3 3 * 00 28 33.4 +56 39 33   17.79 16.77 16.17   ~ 2 0
6 [SGR2000] CB 3 6 * 00 28 33.9 +56 39 54   12.46 12.07 11.79   ~ 2 0
7 [SGR2000] CB 3 16 * 00 28 39.0 +56 41 19   16.39 15.68 15.26   ~ 2 0
8 [SGR2000] CB 3 10 * 00 28 39.3 +56 40 09   18.41 17.47 16.85   ~ 2 0
9 [SGR2000] CB 3 20 * 00 28 40.2 +56 41 48   15.03 14.52 14.22   ~ 2 0
10 [SGR2000] CB 3 11 * 00 28 42.5 +56 40 10   15.67 14.95 14.50   ~ 2 0
11 [SGR2000] CB 3 13 * 00 28 43.3 +56 40 39   18.61 17.63 17.01   ~ 2 0
12 [SGR2000] CB 3 4 * 00 28 43.4 +56 39 46   17.85 16.83 16.27   ~ 2 0
13 [SGR2000] CB 3 27 * 00 28 43.5 +56 42 52   15.01 14.42 14.06   ~ 2 0
14 LBN 119.83-06.05 MoC 00 28 43.5075 +56 41 56.868           ~ 65 0
15 [SGR2000] CB 3 29 * 00 28 43.7 +56 43 18   16.63 15.86 15.45   ~ 2 0
16 [SGR2000] CB 3 5 * 00 28 45.9 +56 39 51   15.15 14.65 14.33   ~ 2 0
17 [SGR2000] CB 3 21 * 00 28 46.1 +56 41 50   14.69 13.97 13.59   ~ 2 0
18 [SGR2000] CB 3 7 * 00 28 47.1 +56 40 07   14.67 14.11 13.79   ~ 2 0
19 [SGR2000] CB 3 1 * 00 28 48.8 +56 39 19   13.29 12.99 12.79   ~ 2 0
20 [SGR2000] CB 3 19 * 00 28 49.0 +56 41 45   14.81 14.41 14.17   ~ 2 0
21 [SGR2000] CB 3 18 * 00 28 51.3 +56 41 42   15.70 14.21 13.42   ~ 2 0
22 [SGR2000] CB 3 2 * 00 28 52.6 +56 39 26   17.67 16.98 16.53   ~ 2 0
23 [SGR2000] CB 3 17 * 00 28 55.8 +56 41 36   16.41 15.80 15.43   ~ 2 0
24 [SGR2000] CB 3 9 * 00 28 56.2 +56 40 13   13.62 13.12 12.80   ~ 2 0
25 [SGR2000] CB 3 8 * 00 28 57.1 +56 40 10   17.99 17.17 16.63   ~ 2 0
26 [SGR2000] CB 3 25 * 00 28 57.9 +56 42 48   16.04 15.34 14.89   ~ 2 0
27 [SGR2000] CB 3 14 * 00 28 58.3 +56 41 04   18.23 17.36 16.81   ~ 2 0
28 [SGR2000] CB 3 28 * 00 28 58.6 +56 43 18   14.40 13.97 13.70   ~ 2 0
29 [SGR2000] CB 3 12 * 00 29 01.8 +56 40 38   16.13 15.40 14.96   ~ 2 0
30 [SGR2000] CB 3 30 * 00 29 03.0 +56 43 42   15.67 14.86 14.57   ~ 2 0
31 [SGR2000] CB 3 15 * 00 29 07.8 +56 41 12   15.56 14.79 14.34   ~ 2 0
32 [SGR2000] CB 3 24 * 00 29 07.9152524910 +56 42 46.182365118   16.08 15.47 15.06   ~ 2 0
33 GSC 00012-00261 * 00 54 37.1568828765 +00 38 57.601775793 14.472 13.992 13.178 12.732 12.338 ~ 17 0
34 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3577 0
35 GSC 04737-00114 * 04 53 18.872 -00 05 01.59 13.105 12.215 11.138 10.581 10.072 G9III 10 0
36 [SGR2000] CB 25 13 * 04 58 45.2 +52 04 55   18.81 17.27 16.28   ~ 2 0
37 [SGR2000] CB 25 12 * 04 58 47.8 +52 04 41   18.48 17.37 16.67   ~ 2 0
38 [SGR2000] CB 25 20 * 04 58 48.9358558244 +52 05 58.990873222   19.04 17.90 17.17   ~ 2 0
39 [SGR2000] CB 25 9 * 04 58 49.4 +52 04 08   16.04 14.13 13.05   ~ 2 0
40 [SGR2000] CB 25 15 * 04 58 50.5 +52 05 08   17.20 15.46 14.45   ~ 2 0
41 [SGR2000] CB 25 11 * 04 58 50.8416993500 +52 04 38.033891214   16.28 15.21 14.51   ~ 2 0
42 [SGR2000] CB 25 2 * 04 58 54.4 +52 01 12   17.95 16.80 16.06   ~ 2 0
43 2MASS J04585447+5205551 * 04 58 54.4752905104 +52 05 55.125359757   17.57 16.20 15.33   ~ 2 0
44 [SGR2000] CB 25 4 * 04 58 55.2 +52 02 14   16.47 15.23 14.51   ~ 2 0
45 2MASS J04585662+5205183 * 04 58 56.6258489022 +52 05 18.279046612   19.12 17.67 16.77   ~ 2 0
46 2MASS J04585873+5205098 * 04 58 58.7363134804 +52 05 09.763345497   18.65 17.16 16.22   ~ 2 0
47 [SGR2000] CB 25 21 * 04 59 02.6610572308 +52 06 01.824253542   19.83 18.19 17.09   ~ 2 0
48 LDN 1437 DNe 04 59 04.1 +52 03 24           ~ 19 0
49 [SGR2000] CB 25 5 * 04 59 04.8 +52 02 32   18.17 16.88 16.02   ~ 2 0
50 [SGR2000] CB 25 18 * 04 59 12.0 +52 05 33   19.07 17.81 16.99   ~ 2 0
51 [SGR2000] CB 25 7 * 04 59 13.0 +52 03 19   19.12 17.38 16.37   ~ 2 0
52 [SGR2000] CB 25 10 * 04 59 13.1 +52 04 24   18.55 17.33 16.53   ~ 2 0
53 [SGR2000] CB 25 3 * 04 59 13.5 +52 01 15   18.18 16.76 15.87   ~ 2 0
54 [SGR2000] CB 25 8 * 04 59 20.1 +52 03 26   16.74 16.04 15.57   ~ 2 0
55 [SGR2000] CB 25 1 * 04 59 20.2 +52 01 05   16.66 15.61 14.94   ~ 2 0
56 [SGR2000] CB 25 14 * 04 59 21.1 +52 05 10   18.55 17.19 16.32   ~ 2 0
57 [SGR2000] CB 25 6 * 04 59 21.8 +52 02 35   17.83 17.08 16.53   ~ 2 0
58 IC 423 MoC 05 33 21 -00 38.0           ~ 21 0
59 [SGR2000] CB 39 7 * 06 01 46.9 +16 29 10   18.51 17.52 17.11   ~ 2 0
60 [SGR2000] CB 39 13 * 06 01 47.4 +16 30 56   15.51 14.77 14.49   ~ 2 0
61 [SGR2000] CB 39 16 * 06 01 47.9934779898 +16 31 49.810254222   15.70 14.89 14.59   ~ 2 0
62 [SGR2000] CB 39 20 * 06 01 49.1015813400 +16 32 40.238559236   15.32 17.71 14.52   ~ 2 0
63 [SGR2000] CB 39 17 * 06 01 49.7394921890 +16 31 58.885306321   17.61 16.72 16.36   ~ 2 0
64 [SGR2000] CB 39 11 * 06 01 50.0 +16 30 08   18.38 17.38 16.98   ~ 2 0
65 [SGR2000] CB 39 6 * 06 01 51.0 +16 29 07   19.07 17.98 17.54   ~ 2 0
66 [SGR2000] CB 39 9 * 06 01 52.4 +16 29 41   17.10 15.49 14.75   ~ 2 0
67 [SGR2000] CB 39 15 * 06 01 53.2002229557 +16 31 40.287717441   18.99 17.57 16.87   ~ 2 0
68 [SGR2000] CB 39 5 * 06 01 55.4 +16 28 44   17.57 16.59 16.19   ~ 2 0
69 [SGR2000] CB 39 3 * 06 01 56.9 +16 28 19   17.76 15.95 15.11   ~ 2 0
70 [SGR2000] CB 39 4 * 06 01 57.4 +16 28 29   18.50 17.25 16.73   ~ 2 0
71 [SGR2000] CB 39 2 * 06 01 58.3 +16 27 59   19.08 17.92 17.41   ~ 2 0
72 [SGR2000] CB 39 1 * 06 01 59.2 +16 27 56   19.25 18.14 17.64   ~ 2 0
73 [DB2002b] G192.63-3.05 MoC 06 02 00 +16 31.0           ~ 25 0
74 [SGR2000] CB 39 21 * 06 02 01.7 +16 33 01   16.79 15.68 15.14   ~ 2 0
75 [SGR2000] CB 39 8 * 06 02 04.7 +16 29 25   19.60 18.33 17.74   ~ 2 0
76 [SGR2000] CB 39 14 * 06 02 05.8 +16 31 41   18.12 16.76 16.11   ~ 2 0
77 [SGR2000] CB 39 10 * 06 02 07.6 +16 29 55   17.34 16.02 15.41   ~ 2 0
78 [SGR2000] CB 39 18 * 06 02 09.9 +16 32 27   18.20 16.94 16.37   ~ 2 0
79 [SGR2000] CB 39 12 * 06 02 10.2 +16 30 31   19.88 18.22 17.47   ~ 2 0
80 [SGR2000] CB 39 19 * 06 02 11.8 +16 32 29   18.47 16.59 15.73   ~ 2 0
81 [DB2002b] G227.77-8.20 MoC 06 48 43 -16 53.4           ~ 19 0
82 [CB88] 54 MoC 07 04 21.2170 -16 23 15.000           ~ 43 0
83 HD 105183 HS* 12 06 47.2351675221 +11 40 12.658737086   10.93 11.06     sdB8IIIHe2 105 0
84 [CB88] 62 MoC 13 34 46 +79 53.4           ~ 7 0
85 LDN 1082 DNe 20 51.1 +60 11           ~ 34 0
86 LDN 1253 DNe 23 56 32 +58 31.7           ~ 53 0

    Equat.    Gal    SGal    Ecl

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2020.12.02-12:14:22

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