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 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:
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RA (2000) DE GLON GLAT Designation(s)
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03 11 40.0 +53 20 45 143.03 +3.96 NGC 1220
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table.dat 40 239 Photometry of NGC 1220
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Byte-by-byte Description of file: table.dat
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Bytes Format Units Label Explanations
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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
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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
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Acknowledgements: Giovanni Carraro
(End) Patricia Bauer [CDS] 03-Oct-2002