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J/A+A/464/573       VI photometry of 5 open clusters         (Carraro+, 2007)

Photometry of the five marginally studied open clusters Collinder 74, Berkeley 27, Haffner 8, NGC 2509, and VdB-Hagen 4. Carraro G., Costa E. <Astron. Astrophys. 464, 573 (2007)> =2007A&A...464..573C
ADC_Keywords: Clusters, open ; Photometry, CCD Keywords: open clusters and associations: general - stars: Hertzsprung-Russell (HR) and C-M diagrams Abstract: 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. 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. The analysis is based on the comparison between field star 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. 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 20kpc from the Galactic center. Such an extreme distance is compatible with the cluster belonging to the Norma-Cygnus arm. Objects: --------------------------------------------------------------- RA (2000) DE Designation(s) (files) --------------------------------------------------------------- 06 51 18 +05 46.0 Cl Berkeley 27 = C 0648+058 (table1) 07 23 24 -12 20.0 Cl Haffner 8 = C 0721-122 (table2) 08 00 42 -19 04.0 NGC 2509 = C 0758-189 (table3) 05 48 30 +07 24.0 Cl Collinder 74 = C 0545+073 (table4) 07 37 48 -36 02.0 Cl VdBH 4 = C 0736-359 (table5) --------------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 65 4632 Photometry of Berkeley 27 table2.dat 65 4746 Photometry of Haffner 8 table3.dat 65 2995 Photometry of NGC 2509 table4.dat 65 2198 Photometry of Collinder 74 table5.dat 65 8353 Photometry of VdB-Hagen 4
Byte-by-byte Description of file: table?.dat
Bytes Format Units Label Explanations
1- 5 I5 --- Seq Star sequential number in the cluster 8- 15 F8.3 pix Xpos X position (1) 18- 25 F8.3 pix Ypos Y position (1) 29- 35 F7.4 mag Vmag Johnson V magnitude 40- 45 F6.4 mag e_Vmag Error in V magnitude 49- 55 F7.4 mag Icmag Cousins I magnitude 60- 65 F6.4 mag e_Icmag Error in Ic magnitude
Note (1): North is up, East to the left. 1 pix = 0.369".
Acknowledgements: Giovanni Carraro, giovanni.carraro(at)unipd.it
(End) Giovanni Carraro [Padova, Italy], Patricia Vannier [CDS] 25-Jan-2007
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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