Photometry of the five marginally studied open clusters Collinder 74, Berkeley 27, Haffner 8, NGC 2509, and VdB-Hagen 4

Context. The stellar populations in the outer Galactic disk are a subject of wide interest nowadays. To contribute to a better picture of this part of the Galaxy, we have studied the nature of five marginally investigated star clusters (Collinder 74, Berkeley 27, Haffner 8, NGC 2509, and VdB-Hagen4)...

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Published inAstronomy and astrophysics (Berlin) Vol. 464; no. 2; pp. 573 - 580
Main Authors Carraro, G., Costa, E.
Format Journal Article
LanguageEnglish
Published Les Ulis EDP Sciences 01.03.2007
Subjects
Astronomy
Earth, ocean, space
Exact sciences and technology
Italy, Veneto, Padova
Young cluster
Isochrone
Galaxies
open clusters and associations: general
Open clusters
Star clusters
Galactic disks
Star models
Stellar population
Stellar magnitude
Color-magnitude diagrams
CCD photometry
stars: Hertzsprung-Russell (HR) and C-M diagrams
Galactic centers
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Summary:Context. The stellar populations in the outer Galactic disk are a subject of wide interest nowadays. To contribute to a better picture of this part of the Galaxy, we have studied the nature of five marginally investigated star clusters (Collinder 74, Berkeley 27, Haffner 8, NGC 2509, and VdB-Hagen4) by means of accurate CCD photometry in the V and I passbands. These clusters are in fact located in the third Galactic quadrant. Aims. We aim to obtain the basic parameters of these objects, which in some cases are still disputed in the literature. In the case of VdB-Hagen 4 we provide the first estimate of its fundamental parameters, while for Haffner 8 we present the first CCD photometry. Methods. The analysis is based on the comparison between field stars decontaminated color magnitude diagrams and stellar models. Particular care is devoted to the the assessment of the data quality and the statistical field star decontamination. The Padova library of stellar isochrones is adopted in this study. Results. The analysis we carried out allowed us to solve a few inconsistencies in the literature regarding Haffner 8 and NGC 2509. Collinder 74 is found to be significantly older than reported before. VdB-Hagen 4 is a young open cluster located more than 20 kpc from the Galactic center. Such an extreme distance is compatible with the cluster belonging to the Norma-Cygnus arm.
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content type line 23
ISSN:0004-6361
1432-0746
DOI:10.1051/0004-6361:20066350