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J/A+A/391/179       UBV CCD photometry of NGC 1220             (Ortolani+, 2002)

A photometric study of the young open cluster NGC 1220. Ortolani S., Carraro G., Covino S., Bica E., Barbuy B. <Astron. Astrophys. 391, 179 (2002)> =2002A&A...391..179O
ADC_Keywords: Clusters, open ; Photometry, UBV ; Photometry, CCD Keywords: open clusters and associations: individual: NGC 1220 - open clusters and associations: general Abstract: We present UBV CCD observations obtained in the field of the northern open cluster NGC 1220, for which little information is available. We provide also BV CCD photometry of a field 5' northward of NGC 1220 to take into account field star contamination. We argue that NGC 1220 is a young compact open cluster, for which we estimate a core radius in the range 1.5-2.0arcmin. We identify 26 likely candidate members with spectral type earlier than A5, down to V0=15.00mag on the basis of the position in the two-colour Diagram and in the Colour Magnitude Diagrams (CMDs). By analyzing the distribution of these stars in the colour-colour and CMDs, we find that NGC 1220 has a reddening E(B-V)=0.70±0.15mag, is placed 1800±200pc distant from the Sun, and has an age of about 60Myrs. The cluster turns out to be located about 120pc above the Galactic plane, relatively high with respect to its age. Objects: -------------------------------------------------------- RA (2000) DE GLON GLAT Designation(s) -------------------------------------------------------- 03 11 40.0 +53 20 45 143.03 +3.96 NGC 1220 -------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table.dat 40 239 Photometry of NGC 1220
Byte-by-byte Description of file: table.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Seq Sequential number 5- 11 F7.2 pix Xpos X coordinates (1) 13- 19 F7.2 pix Ypos Y coordinates (1) 21- 26 F6.3 mag Vmag ?=99.999 V band magnitude 28- 33 F6.3 mag B-V ?=99.999 (B-V) color index 35- 40 F6.3 mag U-B ?=99.999 (U-B) color index
Note (1): The center is in (500.0,500.0) pixel. The scale is 0.46"/pix. East is toward negative X, South toward negative Y. Right ascension and Declination are available in VizieR table
Acknowledgements: Giovanni Carraro
(End) Patricia Bauer [CDS] 03-Oct-2002
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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