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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 asubject of wide interest nowadays. To contribute to a better picture ofthis part of the Galaxy, we have studied the nature of five marginallyinvestigated star clusters (Collinder 74, Berkeley 27, Haffner 8, NGC2509, and VdB-Hagen4) by means of accurate CCD photometry in the V and Ipassbands. These clusters are in fact located in the third Galacticquadrant. Aims: We aim to obtain the basic parameters of these objects,which in some cases are still disputed in the literature. In the case ofVdB-Hagen 4 we provide the first estimate of its fundamental parameters,while for Haffner 8 we present the first CCD photometry. Methods: Theanalysis is based on the comparison between field stars decontaminatedcolor magnitude diagrams and stellar models. Particular care is devotedto the the assessment of the data quality and the statistical field stardecontamination. The Padova library of stellar isochrones is adopted inthis study. Results: The analysis we carried out allowed us to solve afew 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 theGalactic center. Such an extreme distance is compatible with the clusterbelonging to the Norma-Cygnus arm.Photometric data is only available in electronic form at the CDS viaanonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or viahttp://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/464/573
| Study of Old Open Clusters NGC 1605, Czernik 18, NGC 2509
We present the first CCD photometric UBVRI observations of three openclusters NGC 1605 (OCI 406), Czernik 18 (OCI 426) and NGC 2509 (OCI 630)obtained by using the 1.02 m telescope at Vainu Bappu Observatory,Kavalur. While the colour excell E(B-V) for the cluster OCI 426 is foundto be 0.43 mag, it is estimated to be 0.14 mag for OCI 406 and 0.15 magfor OCI 630. After correcting for these colour excesses, their distancesare found to be 1148 pc (OCI 406), 955 pc (OCI 426), and 912 pc (OCI630). Further, as the ages of these clusters are found to be in therange of 0.8 x 109 yrs to 8 x 109 yrs, they may be categorised as oldopen clusters.
| Study of open cluster NGC 2509.
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| Upper main sequence and blue stragglers in galactic open clusters.
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