2005A&A...443..465B


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.08CET03:27:13

2005A&A...443..465B - Astronomy and Astrophysics, volume 443, 465-475 (2005/11-4)

Properties of five low-contrast open clusters in the third quadrant.

BICA E. and BONATTO C.

Abstract (from CDS):

We derive photometric, structural and dynamical evolution-related parameters of five as yet unstudied low-contrast open clusters located in the third quadrant using 2MASS data. The target clusters are Czernik31, Czernik32, Haffner9, Haffner11 and Trumpler13. We apply a statistical field-star decontamination procedure to infer on the intrinsic colour-magnitude diagram (CMD) morphology which is critical for such low-contrast objects. Consequently, it became possible to derive accurate reddening, age, distance from the Sun and Galactocentric distance for the five clusters. In the structural and luminosity/mass-function analyses we apply a colour-magnitude filter which encompasses the cluster evolutionary CMD sequences and excludes stars with discrepant colours. Using this procedure we derive core and limiting radii, mass function (MF) slope, total mass, mass density and relaxation time. We derive ages in the range 140-1100Myr, Galactocentric distances within 7.7-11.4kpc, and total masses within 360-2900M. Reflecting large-scale mass segregation, the MF slope in the core is significantly flatter than that in the halo of the five clusters. Although some of the present clusters are relatively younger than the Gyr-old clusters, they present evidence of advanced dynamical evolution. This kind of study has become possible because of the photometric uniformity and spatial coverage of 2MASS which allows a proper subtraction of the field-star contamination on the target CMDs. The present study indicates that low-contrast clusters can be studied with 2MASS, particularly after field-star subtraction, which is important since most of the unstudied open clusters belong to this class.

Abstract Copyright:

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

Simbad objects: 17

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Number of rows : 17

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NGC 188 OpC 00 48 26 +85 15.3           ~ 796 0
2 M 41 OpC 06 46 01 -20 45.4   4.89 4.5     ~ 244 0
3 C 0722-169 OpC 07 24 42 -17 00.0           ~ 12 0
4 ESO 429-3 OpC 07 35 23 -27 42.3           ~ 15 0
5 ESO 560-3 OpC 07 36.8 -20 30           ~ 11 0
6 NGC 2447 OpC 07 44 30 -23 51.4           ~ 114 1
7 C 0748-297 OpC 07 50 30 -29 50.7           ~ 13 0
8 NGC 2477 OpC 07 52 10 -38 31.8   6.64 5.8     ~ 253 0
9 NGC 2516 OpC 07 58 04 -60 45.2           ~ 576 0
10 NGC 2548 OpC 08 13 43 -05 45.0           ~ 136 0
11 NGC 2682 OpC 08 51 18 +11 48.0           ~ 1991 0
12 ESO 127-17 OpC 10 23 48 -60 08.0     11.3     ~ 8 0
13 NGC 3680 OpC 11 25 38 -43 14.6   8.40 7.6     ~ 285 0
14 NGC 5822 OpC 15 04 28 -54 23.4     6.5     ~ 166 0
15 IC 4651 OpC 17 24 49 -49 56.0           ~ 306 0
16 M 26 OpC 18 45 18 -09 23.0   8.0 8.87     ~ 86 0
17 NAME Cyg X Cld 20 28 41 +41 10.2           ~ 591 1

    Equat.    Gal    SGal    Ecl

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2019.12.08-03:27:13

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