2010A&A...516A...2M


C.D.S. - SIMBAD4 rel 1.7 - 2020.06.06CEST17:23:12

2010A&A...516A...2M - Astronomy and Astrophysics, volume 516, A2-2 (2010/6-2)

Fitting isochrones to open cluster photometric data. A new global optimization tool.

MONTEIRO H., DIAS W.S. and CAETANO T.C.

Abstract (from CDS):

We present a new technique to fit color-magnitude diagrams of open clusters based on the cross-entropy global optimization algorithm. The method uses theoretical isochrones available in the literature and maximizes a weighted likelihood function based on distances measured in the color-magnitude space. The weights are obtained through a non parametric technique that takes into account the star distance to the observed center of the cluster, observed magnitude uncertainties, the stellar density profile of the cluster among others. The parameters determined simultaneously are distance, reddening, age and metallicity. The method takes binary fraction into account and uses a Monte-Carlo approach to obtain uncertainties on the determined parameters for the cluster by running the fitting algorithm many times with a re-sampled data set through a bootstrapping procedure. We present results for 9 well studied open clusters, based on 15 distinct data sets, and show that the results are consistent with previous studies. The method is shown to be reliable and free of the subjectivity of most previous visual isochrone fitting techniques.

Abstract Copyright:

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

Status at CDS:  

Simbad objects: 9

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Number of rows : 9

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 C 0132+610 OpC 01 35 38 +61 16.5   8.35 8.1     ~ 91 0
2 NGC 2266 OpC 06 43 20 +26 59.1     9.5     ~ 52 0
3 Cl Berkeley 32 OpC 06 58 06 +06 26.0           ~ 106 0
4 NGC 2355 OpC 07 16 59 +13 45.0     9.7     ~ 64 0
5 NGC 2477 OpC 07 52 10 -38 31.8   6.64 5.8     ~ 256 0
6 NGC 2506 OpC 08 00 01 -10 46.2   8.28 7.6     ~ 220 0
7 NGC 2682 OpC 08 51 18 +11 48.0           ~ 2027 0
8 Cl Melotte 105 OpC 11 19 42 -63 29.0   9.05 8.5     ~ 64 0
9 NGC 7044 OpC 21 13 10 +42 29.7     12.0     ~ 47 0

    Equat.    Gal    SGal    Ecl

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2020.06.06-17:23:12

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