2015A&A...574A..66D


Query : 2015A&A...574A..66D

2015A&A...574A..66D - Astronomy and Astrophysics, volume 574A, 66-66 (2015/2-1)

Deriving physical parameters of unresolved star clusters. III. Application to M31 PHAT clusters.

DE MEULENAER P., NARBUTIS D., MINEIKIS T. and VANSEVICIUS V.

Abstract (from CDS):

This study is the third of a series that investigates the degeneracy and stochasticity problems present in the determination of physical parameters such as age, mass, extinction, and metallicity of partially resolved or unresolved star cluster populations situated in external galaxies when using broad-band photometry. This work tests the derivation of parameters of artificial star clusters using models with fixed and free metallicity for the WFC3+ACS photometric system. Then the method is applied to derive parameters of a sample of 203 star clusters in the Andromeda galaxy observed with the HST. Following Papers I and II, the star cluster parameters are derived using a large grid of stochastic models that are compared to the observed cluster broad-band integrated WFC3+ACS magnitudes. We derive the age, mass, and extinction of the sample of M31 star clusters with one fixed metallicity in agreement with previous studies. Using artificial tests we demonstrate the ability of the WFC3+ACS photometric system to derive the metallicity of star clusters. We show that the metallicity derived using photometry of 36 massive M31 star clusters is in a good agreement with the metallicity previously derived using spectroscopy taken from literature.

Abstract Copyright:

Journal keyword(s): galaxies: individual: M31 - galaxies: star clusters: general

Simbad objects: 7

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Number of rows : 7
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 Bol D64 GlC 00 42 35.5314236304 +41 14 34.207402308 17.472 17.201 16.349 15.828 15.51 ~ 29 2
2 ACH 5 GlC 00 42 37.98 +41 15 58.9 19.00 18.180 17.98 16.990 17.17 ~ 28 0
3 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 12724 1
4 Bol 157 GlC 00 43 13.9846488552 +41 11 19.669457760 18.360 18.305 17.623 17.191 16.857 A 36 0
5 Bol 165 GlC 00 43 18.2207068848 +41 10 54.647724792 17.252 17.214 16.483 16.037 15.62 ~ 44 0
6 Bol 229 GlC 00 44 33.8077598424 +41 38 28.523561676 17.165 17.083 16.430 15.942 15.443 ~ 47 1
7 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 11227 1

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