2008A&A...478..419S

Query : 2008A&A...478..419S

2008A&A...478..419S - Astronomy and Astrophysics, volume 478, 419-427 (2008/2-1)

Near infrared photometric and optical spectroscopic study of 22 low mass star clusters embedded in nebulae.

SOARES J.B., BICA E., AHUMADA A.V. and CLARIA J.J.

Abstract (from CDS):

Among the star clusters in the Galaxy, those embedded in nebulae represent the youngest group, which has only recently been explored. The analysis of a sample of 22 candidate embedded stellar systems in reflection nebulae and/or HII environments is presented. We employed optical spectroscopic observations of stars in the directions of the clusters carried out at CASLEO (Argentina) together with near infrared photometry from the 2MASS catalogue. Our analysis is based on source surface density, colour-colour diagrams and on theoretical pre-main sequence isochrones. We take into account the field star contamination by carrying out a statistical subtraction. The studied objects have the characteristics of low mass systems. We derive their fundamental parameters. Most of the cluster ages are younger than 2Myr. The studied embedded stellar systems in reflection nebulae and/or HII region complexes do not have stars of spectral types earlier than B. The total stellar masses locked in the clusters are in the range 20-220M☉. They are found to be gravitationally unstable and are expected to dissolve in a timescale of a few Myr.

Abstract Copyright: ∼

Journal keyword(s): Galaxy: open clusters and associations: general

Nomenclature: Table 2: [SBA2008] DBSBNNN-N N=15.

CDS comments: In tab.1: Bran 66 is a misprint for SFO 66

Simbad objects: 66

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Number of rows : 66
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 CD-28 595 PM* 01 54 50.2703221766 -27 28 35.739139915   12.06 11.51     ~ 130 0
2 L 595-22 Pe* 05 56 24.7419040752 -27 51 32.361761700   12.31 12.38     sdG 164 0
3 WG 8 WD* 06 16 14.2567729529 -59 12 27.405103079   14.00 14.09     DB3+ 61 0
4 NAME SFO 27 Star Cluster Cl* 07 04 03 -11 23.7           ~ 6 0
5 HD 54662 SB* 07 09 20.2493151288 -10 20 47.635088964 5.35 6.24 6.21 7.23   O6.5Vz(n)+O7.5Vz 340 2
6 GUM 5 HII 07 09.7 -18 26           ~ 5 0
7 IRAS 07079-1820 Cl* 07 10 12 -18 26.3           ~ 2 0
8 BRAN 22C RNe 07 24 14.1 -24 38 16           ~ 9 0
9 [DBS2003] 11 OpC 07 24 16 -24 38.0           ~ 11 1
10 BRAN 58 RNe 07 37 44.4 -32 50 30           ~ 5 0
11 [DBS2003] 14 Cl* 07 37 46 -32 50.5           ~ 2 0
12 [SBA2008] DBSB031-1 * 08 52 29.0 -48 46 12           B3-4V 1 0
13 [DBS2003] 31 Cl* 08 52 30 -48 45.9           ~ 2 0
14 BRAN 221 RNe 09 01 49.6 -44 44 18           ~ 5 0
15 [DBS2003] 30 Cl* 09 01 54 -44 43.5           ~ 3 0
16 [DBS2003] 35 OpC 09 15 11 -47 28.5           ~ 5 0
17 BRAN 242 RNe 09 15 14.1 -47 29 03           ~ 6 0
18 [SBA2008] DBSB039-1 * 09 24 24.0 -53 07 59           A7V 1 0
19 BRAN 262 RNe 09 24 24.2 -53 07 59           ~ 5 0
20 [SBA2008] DBSB039-2 * 09 24 25.0 -53 08 01           A5-7V 1 0
21 UBC 489 OpC 09 24 38 -53 04.1           ~ 7 0
22 [DBS2003] 40 OpC 10 01 22 -57 43.2           ~ 7 0
23 [DBS2003] 41 Cl* 10 01 28 -57 43.8           ~ 3 0
24 BRAN 280 RNe 10 01 28.8 -57 42 43           ~ 5 0
25 RCW 46 HII 10 06 39 -57 12.2           ~ 18 0
26 [SBA2008] DBSB042-1 * 10 07 30.0 -57 32 59           A8-9V 1 0
27 [DBS2003] 42 Cl* 10 07 33 -57 33.5           ~ 3 0
28 BRAN 288 RNe 10 07 41.7 -57 33 46           ~ 8 0
29 CD-34 6792 PM* 10 32 13.6185546336 -35 37 41.711776068   12.84 11.84     F:wl: 149 0
30 [SBA2008] DBSB049-3 * 10 51 06.0 -54 20 51           B6V 1 0
31 [SBA2008] DBSB049-1 * 10 51 06.0 -54 20 42           A5-7V 1 0
32 BRAN 322B ISM 10 51 06.4 -54 20 42           ~ 5 0
33 [DBS2003] 49 Cl* 10 51 08 -54 20.8           ~ 4 0
34 [SBA2008] DBSB049-2 * 10 51 09.0 -54 20 25           B0V 1 0
35 [DBS2003] 64 OpC 11 24 41 -58 56.5           ~ 5 0
36 HD 304260 Em* 11 24 49.0703006736 -58 56 56.361731784   10.570 10.466 10.564 10.29 B5 8 0
37 SFO 66 Cld 11 33 49.5 -63 16 20           ~ 6 0
38 [SBA2008] DBSB069-2 * 11 33 53.0 -63 16 52           B3-4V 1 0
39 [DBS2003] 69 OpC 11 33 54 -63 16.8           ~ 5 0
40 [SBA2008] DBSB069-1 * 11 33 54.1757349480 -63 16 38.243396100           B5V 3 0
41 IC 2944 OpC 11 38 20.00 -63 22 22.0           ~ 184 0
42 [DBS2003] 70 Cl* 11 48 36 -62 17.3           ~ 5 0
43 [SBA2008] DBSB070-1 * 11 48 37.0 -62 17 26           G9-K0V 1 0
44 VdBH 55 RNe 11 48 43 -62 19.6           ~ 4 0
45 [SBA2008] DBSB081-1 * 12 58 40.0 -66 22 18           B6V 1 0
46 [DBS2003] 81 Cl* 12 58 40 -66 21.1           ~ 2 0
47 BRAN 399 * 12 58 41.2 -66 22 16   12.8 12.4     B4V 11 1
48 [DBS2003] 87 OpC 13 32 47 -60 26.9           ~ 6 0
49 ESO 132-12 ISM 13 32 51 -60 26.7           ~ 2 0
50 [SBA2008] DBSB088-1 * 14 19 37.0 -61 25 04           A1-3V 1 0
51 [KPS2012] MWSC 2213 OpC 14 19 37 -65 25.9           ~ 6 0
52 RCW 85 HII 14 20.7 -61 24           ~ 15 1
53 VdBH 73e A RNe 16 46 26.170 -41 15 01.05           ~ 2 0
54 [SBA2008] DBSB109-1 * 16 47 10.0 -41 16 31           B1-2V 1 0
55 [DBS2003] 109 Cl* 16 47 11 -41 16.5           ~ 2 0
56 GRS G345.30 +01.50 HII 16 58.9 -40 12           ~ 2 0
57 [DBS2003] 114 Cl* 16 59 10 -40 12.1           ~ 3 0
58 [DBS2003] 104 OpC 17 03 59 -51 05.3           ~ 11 0
59 HD 153771 * 17 03 59.5522980631 -51 04 57.324621270   8.90 8.83     B2V 16 0
60 VdBH 81 RNe 17 04.0 -51 05           ~ 5 0
61 HD 153772 bC* 17 04 01.2303688176 -51 05 01.153454748 7.77 8.38 8.32     B2V 25 0
62 GRS G350.60 +00.90 HII 17 16.9 -36 21           ~ 14 0
63 [DBS2003] 121 Cl* 17 17 01 -36 22.2           ~ 7 0
64 [DBS2003] 123 OpC 17 17 15 -36 20.3           ~ 10 0
65 CD-30 17706 WD* 20 10 56.8486912016 -30 13 06.627142663 11.654 12.286 12.242 12.311 12.381 DA3.1 249 0
66 LP 877-23 PM* 22 52 41.0353986762 -20 35 32.994432457   13.02 11.90     ~ 113 0

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