2011A&A...530A..32B


Query : 2011A&A...530A..32B

2011A&A...530A..32B - Astronomy and Astrophysics, volume 530A, 32-32 (2011/6-1)

Star clusters or asterisms? 2MASS CMD and structural analyses of 15 challenging targets.

BICA E. and BONATTO C.

Abstract (from CDS):

Poorly-populated star clusters may have photometric and structural properties not much different from asterisms, to the point that, in some cases, widely-used databases present conflicting classifications. We investigate the nature of a sample of challenging targets that have been classified either as star clusters or asterisms in different studies. A few objects are studied for the first time. The analysis employs 2MASS photometry, field-star decontamination, to enhance the intrinsic colour-magnitude diagram (CMD) morphology, and colour-magnitude filters, for high contrast stellar radial density profiles (RDPs). Based on properties derived from field-star decontaminated CMDs, and structural parameters from RDPs, we find that Pismis 12, IC 1434, Juchert 10, Ruprecht 30, NGC 3519, Herschel 1, Mayer 1, and Muzzio 1 are open clusters with ages within 5Myr-1.3Gyr. Ruprecht 129, 130, 140, and 146 are borderline cases, being rather poorly-populated, with evolutionary sequences and RDPs suggesting star clusters. Dolidze 39, BH 79, and Ruprecht103, have CMDs and RDPs typical of asterisms. When a low stellar population is associated with a dense field contamination and/or important differential reddening, only a thin line separates star clusters and asterisms. These cases require specific analytical tools to establish their nature.

Abstract Copyright:

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

CDS comments: "Herschel 1" is [FSR2007] 1141 in SIMBAD.

Simbad objects: 22

goto Full paper

goto View the references in ADS

Number of rows : 22
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 NAME MAYER 1 OpC 00 21 54.00 +61 45 32.0           ~ 34 2
2 ESO 429-15 OpC 07 42 26.50 -31 27 54.7           ~ 7 1
3 NAME Herschel 1 OpC 07 46 41.8 +00 08 13           ~ 33 0
4 HD 63065 * 07 47 02.4658029096 +00 01 06.138982560   8.29 8.32     B9.5V 24 0
5 BD+00 2080 * 07 47 02.6690903400 +00 01 23.332080432   9.31 9.27     A2V 20 0
6 UCAC4 451-040246 * 07 47 04.1353895283 +00 01 06.601131772   12.67 12.33 12.504   F5IV 2 0
7 NAME Muzzio 1 OpC 08 57 54.7 -47 45 40           ~ 22 1
8 RCW 38 SFR 08 59 05.50 -47 30 39.4           ~ 305 2
9 ESO 261-5 OpC 09 20 01.7 -45 07 52   10.49 9.7     ~ 27 1
10 C 0942-530 OpC 09 43 43.70 -53 14 50.2           ~ 4 1
11 Cl Ruprecht 93 OpC 11 04 08.9 -61 22 19   8.05 7.7     ~ 42 1
12 ESO 130-11 OpC 12 16 57.80 -58 25 47.2           ~ 11 1
13 Juchert 10 OpC 14 40 11.8 -60 22 30           ~ 13 1
14 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 14383 0
15 ESO 455-40 OpC 17 47 11.50 -29 35 24.0           ~ 7 1
16 Cl Ruprecht 130 OpC 17 47 36.0 -30 05 53           ~ 32 1
17 Cl Ruprecht 140 OpC 18 21 51.00 -33 13 00.0           ~ 8 1
18 ESO 592-4 OpC 18 52 30.80 -21 04 41.5           ~ 7 1
19 Cl Dolidze 39 OpC 20 16 08 +37 53.2           ~ 10 2
20 Ass Cyg OB 1 As* 20 17.8 +37 38           ~ 264 1
21 IC 1434 OpC 22 10 30.0 +52 51 29     9.0     ~ 27 2
22 NAME Vela Field reg ~ ~           ~ 182 0

To bookmark this query, right click on this link: simbad:objects in 2011A&A...530A..32B and select 'bookmark this link' or equivalent in the popup menu