2013A&A...557A..14O


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.15CET20:01:06

2013A&A...557A..14O - Astronomy and Astrophysics, volume 557A, 14-14 (2013/9-1)

Fitting isochrones to open cluster photometric data. III. Estimating metallicities from UBV photometry.

OLIVEIRA A.F., MONTEIRO H., DIAS W.S. and CAETANO T.C.

Abstract (from CDS):

The metallicity is a critical parameter that affects the correct determination of fundamental characteristics of a stellar cluster and has important implications in Galactic and stellar evolution research. Fewer than 10% of the 2174 currently cataloged open clusters have their metallicity determined in the literature. In this work we present a method for estimating the metallicity of open clusters via non-subjective isochrone fitting using the cross-entropy global optimization algorithm applied to UBV photometric data. The free parameters distance, reddening, age, and metallicity simultaneously determined by the fitting method. The fitting procedure uses weights for the observational data based on the estimation of membership likelihood for each star, which considers the observational magnitude limit, the density profile of stars as a function of radius from the center of the cluster, and the density of stars in multi-dimensional magnitude space. We present results of [Fe/H] for nine well-studied open clusters based on 15 distinct UBV data sets. The [Fe/H] values obtained in the ten cases for which spectroscopic determinations were available in the literature agree, indicating that our method provides a good alternative to determining [Fe/H] by using an objective isochrone fitting. Our results show that the typical precision is about 0.1dex.

Abstract Copyright:

Journal keyword(s): galaxies: clusters: general

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     ~ 90 0
2 NGC 2266 OpC 06 43 20 +26 59.1     9.5     ~ 50 0
3 Cl Berkeley 32 OpC 06 58 06 +06 26.0           ~ 105 0
4 NGC 2355 OpC 07 16 59 +13 45.0     9.7     ~ 62 0
5 NGC 2477 OpC 07 52 10 -38 31.8   6.64 5.8     ~ 253 0
6 NGC 2506 OpC 08 00 01 -10 46.2   8.28 7.6     ~ 217 0
7 NGC 2682 OpC 08 51 18 +11 48.0           ~ 1991 0
8 Cl Melotte 105 OpC 11 19 42 -63 29.0   9.05 8.5     ~ 62 0
9 NGC 7044 OpC 21 13 10 +42 29.7     12.0     ~ 46 0

    Equat.    Gal    SGal    Ecl

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2019.12.15-20:01:06

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