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J/A+A/360/529       BVI photometry of 4 young open clusters      (Piatti+, 2000)

Photometric and integrated spectral study of the young open clusters Pismis 22, NGC 6178, NGC 6216 and Ruprecht 130 Piatti A.E., Claria J.J., Bica E. <Astron. Astrophys. 360, 529 (2000)> =2000A&A...360..529P
ADC_Keywords: Clusters, open ; Photometry, CCD ; Photometry, UBVRI Keywords: Galaxy: open clusters and associations: general - Galaxy: open clusters and associations: individual: Pismis 22, NGC 6178, NGC 6216, Ruprecht 130 Abstract: We present CCD observations in the B, V, and I passbands obtained for stars in the fields of the open clusters Pismis 22, NGC 6178, NGC 6216, and Ruprecht 130, projected not far from the Galactic centre (|l|<30°, |b|<2°). The sample consists of about 790 stars reaching down to V∼18-19mag. From the analysis of the colour magnitude diagrams, we confirmed the physical reality of the clusters and derived their reddening, distance and age. In addition, we obtained flux-calibrated integrated spectra in the range 3500-9200Å for the cluster sample. The equivalent widths of the Balmer lines provided us with age estimates, while the comparison with template spectra allowed us to derive both foreground reddening and age. The photometric and spectroscopic results reveal that the four studied objects are young open clusters with ages ranging between 35 and 50Myr. The clusters, located between 1.0kpc and 4.3kpc from the Sun, are affected by different amounts of interstellar visual absorption (0.6≃Av≃6.0). Objects: -------------------------------------------- RA (2000) DE Designation(s) -------------------------------------------- 16 14 09 -51 52.0 Pismis 22 16 35 42 -45 38.0 NGC 6178 16 49 24 -44 44.0 NGC 6216 17 47 36 -30 07.0 Ruprecht 130 -------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 64 187 Pismis 22 field magnitudes and colours of stars table4.dat 64 57 NGC 6178 field magnitudes and colours of stars table5.dat 64 199 NGC 6216 field magnitudes and colours of stars table6a.dat 64 212 Ruprecht 130 BVI magnitudes and colours of stars table6b.dat 51 345 Ruprecht 130 VI magnitudes and colours of stars
See also: J/A+A/370/931 : Melotte 105, Hogg 15, Pismis 21, Ruprecht 140 (Piatti+, 2001) Byte-by-byte Description of file: table[345].dat table6a.dat
Bytes Format Units Label Explanations
1- 4 A4 --- Seq Running number 6- 12 F7.3 pix Xpos X coordinate (1) 14- 20 F7.3 pix Ypos Y coordinate (1) 22- 27 F6.3 mag Vmag V magnitude 29- 33 F5.3 mag e_Vmag V error 35- 40 F6.3 mag B-V B-V colour index 42- 46 F5.3 mag e_B-V B-V error 48- 53 F6.3 mag V-I V-I colour index 55- 59 F5.3 mag e_V-I V-I colour index 64 I1 --- o_Vmag Number of measurements
Note (1): North is up and East is to the left. 1 pix = 0.45". See Fig.1 for adopted cluster center. They are approximatively: Pismis 22: X=190, Y=160; NGC 6178: X=300, Y=280 NGC 6216: X=280, Y=240; Ruprecht 130: X=190, Y=300
Byte-by-byte Description of file: table6b.dat
Bytes Format Units Label Explanations
1- 4 A4 --- Seq Running number 6- 12 F7.3 pix Xpos X coordinate (1) 14- 20 F7.3 pix Ypos Y coordinate (1) 22- 27 F6.3 mag Vmag V magnitude 29- 33 F5.3 mag e_Vmag V error 35- 40 F6.3 mag V-I V-I colour 42- 46 F5.3 mag e_V-I V-I error 51 I1 --- o_Vmag Number of measurements
Note (1): North is up and East is to the left. 1 pix = 0.45". See Fig.1 for adopted cluster center. It is approximatively: Ruprecht 130: X=190, Y=300
Acknowledgements: Andres Piatti
(End) Patricia Bauer [CDS] 28-Aug-2000
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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