2009A&A...508.1279B


C.D.S. - SIMBAD4 rel 1.7 - 2020.11.26CET22:18:22

2009A&A...508.1279B - Astronomy and Astrophysics, volume 508, 1279-1283 (2009/12-4)

Model-independent diagnostics of highly reddened Milky Way star clusters: age calibration.

BELETSKY Y., CARRARO G. and IVANOV V.D.

Abstract (from CDS):

The next generation near- and mid-infrared Galactic surveys will yield a large number of new highly obscured star clusters. Detailed characterization of these new objects with spectroscopy is time-consuming. Diagnostic tools that will be able to characterize clusters based only on the available photometry will be needed to study large samples of the newly found objects. The brightness difference between the red clump and the main-sequence turn-off point have been used as a model-independent age calibrator for clusters with ages from a few 108 to 1010yr in the optical. Here we apply for the first time the method in the near-infrared. We calibrated this difference in K-band, which is likely to be available for obscured clusters, and we apply it to a number of test clusters with photometry comparable to the one that will be yielded by the current or near-future surveys. The new calibration yields reliable ages over the range of ages for which the red clump is present in clusters. The slope of the relation is smoother than that of the corresponding V-band relation, reducing the uncertainty in the age determinations with respect to the optical ones.

Abstract Copyright:

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

CDS comments: No original data associated with this paper

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 - 2021
#notes
1 NGC 188 OpC 00 48 26 +85 15.3           ~ 820 0
2 NGC 752 OpC 01 57 41 +37 47.1           ~ 544 0
3 Cl Berkeley 17 OpC 05 20 37 +30 35.4           ~ 135 0
4 NGC 2141 OpC 06 02 55 +10 26.8   10.43 9.4     ~ 115 0
5 NGC 2420 OpC 07 38 23 +21 34.4   9.0 8.3     ~ 407 0
6 NGC 2477 OpC 07 52 10 -38 31.8   6.64 5.8     ~ 257 0
7 NGC 2506 OpC 08 00 01 -10 46.2   8.28 7.6     ~ 223 0
8 NGC 2509 OpC 08 00.7 -19 04     9.3     ~ 14 0
9 NGC 2682 OpC 08 51 18 +11 48.0           ~ 2061 0
10 NGC 3680 OpC 11 25 38 -43 14.6   8.40 7.6     ~ 291 0
11 NGC 6134 OpC 16 27 46 -49 09.1   7.89 7.2     ~ 130 0
12 NGC 6253 OpC 16 59 05 -52 42.0     10.2     ~ 146 0
13 IC 4651 OpC 17 24 49 -49 56.0           ~ 313 0
14 NGC 6791 OpC 19 20 53 +37 46.3   10.52 9.5     ~ 887 0
15 NGC 6819 OpC 19 41 18 +40 11.2   8.21 7.3     ~ 477 0
16 NGC 6939 OpC 20 31 30 +60 39.7   8.85 7.8     ~ 134 0
17 NGC 7789 OpC 23 57 24 +56 42.5   7.68 6.7     ~ 459 0

    Equat.    Gal    SGal    Ecl

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2020.11.26-22:18:22

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