Issue |
A&A
Volume 442, Number 1, October IV 2005
|
|
---|---|---|
Page(s) | 201 - 209 | |
Section | Galactic structure, stellar clusters, and populations | |
DOI | https://doi.org/10.1051/0004-6361:20053378 | |
Published online | 30 September 2005 |
Structure and stellar content analysis of the open cluster M 11 with 2MASS photometry
1
Departamento de Física, ICEx, UFMG, CP 702, 30123-970 Belo Horizonte, MG, Brazil e-mail: jsantos@fisica.ufmg.br
2
Departamento de Astronomia, IF-UFRGS, CP 15051, 91501-970 Porto Alegre, RS, Brazil
Received:
6
May
2005
Accepted:
3
July
2005
An overall analysis of the structure and stellar content of M 11 is presented,
thanks to the wide-angle 2MASS spatial coverage. We derive photometric and structural
parameters and discuss the spatial dependance of the luminosity and mass functions.
Photometric parameters basically agree with previous ones mostly based on the optical.
We obtained a core radius of 1.23 pc
and a tidal radius of 29 pc. In particular, the cluster is populous enough so that
the tidal radius could be obtained by fitting the three-parameter King profile
to the radial distribution of stars.
We analyzed the spatial distribution of mass functions, finding that the slope changes
from -0.73 in the core to +2.88 in the outer halo. The spatial distribution of
mass function slopes derived from 2MASS agrees with that derived from
optical CCD data, which further confirms the reliability of 2MASS data for future analyses
of this kind at comparable observational limits. We detect mass segregation up to
distances from the center of ≈. We emphasize that the mass
function slope in the core is flatter than anywhere else as a consequence
of mass segregation. The derived total cluster mass is ≈
.
Key words: Galaxy: open clusters and associations: individual: M 11
© ESO, 2005
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