2015A&A...581A.111D


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.14CEST18:46:14

2015A&A...581A.111D - Astronomy and Astrophysics, volume 581A, 111-111 (2015/9-1)

Deriving physical parameters of unresolved star clusters. IV. The M33 star cluster system.

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

Abstract (from CDS):

When trying to derive the star cluster physical parameters of the M33 galaxy using broad-band unresolved ground-based photometry, previous studies mainly made use of simple stellar population models, shown in the recent years to be oversimplified. In this study, we aim to derive the star cluster physical parameters (age, mass, and extinction; metallicity is assumed to be LMC-like for clusters with age below 1Gyr and left free for older clusters) of this galaxy using models that take stochastic dispersion of cluster integrated colors into account. We use three recently published M33 catalogs of cluster optical broad-band photometry in standard UBVRI and in CFHT/MegaCam u*g'r'i'z' photometric systems. We also use near-infrared JHK photometry that we derive from deep 2MASS images. We derive the cluster parameters using a method that takes into account the stochasticity problem, presented in previous papers of this series. The derived differential age distribution of the M33 cluster population is composed of a two-slope profile indicating that the number of clusters decreases when age gets older. The first slope is interpreted as the evolutionary fading phase of the cluster magnitudes, and the second slope as the cluster disruption. The threshold between these two phases occurs at ∼300Myr, comparable to what is observed in the M31 galaxy. We also model by use of artificial clusters the ability of the cluster physical parameter derivation method to correctly derive the two-slope profile for different photometric systems tested.

Abstract Copyright:

Journal keyword(s): galaxies: individual: M 33 - galaxies: star clusters: general

CDS comments: MKKSS 12 is [MKK98] M 33 12 in SIMBAD , CBF85-U137 is [CS82] U137 in SIMBAD.

Simbad objects: 7

goto Full paper

goto View the reference in ADS

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 - 2020
#notes
1 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 10905 1
2 CBF 161 GlC 01 32 44.30 +30 40 12.4 19.741 19.597 18.780 18.294 17.676 ~ 11 0
3 CBF 54 GlC 01 33 14.30 +30 28 22.8 19.362 19.129 18.323 17.752 17.258 ~ 34 0
4 [SSA2010] 1324 GlC 01 33 38.00 +30 38 02.2 18.405 18.328 17.496 16.971 16.395 ~ 11 0
5 M 33 GiG 01 33 50.904 +30 39 35.79 6.17 6.27 5.72     ~ 5135 1
6 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5669 1
7 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14832 1

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2015A&A...581A.111D and select 'bookmark this link' or equivalent in the popup menu


2020.07.14-18:46:14

© Université de Strasbourg/CNRS

    • Contact