UBV CCD photometry of NGC 1220 (Ortolani+, 2002)

Details UBV CCD photometry of NGC 1220 (Ortolani+, 2002) UBV CCD photometry of NGC 1220 (Ortolani+, 2002)

Oct 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002ycat..33910179o&link_type=abstract

VizieR On-line Data Catalog: J/A+A/391/179. Originally published in: 2002A&A...391..179O

Computer Science

Clusters: Open, Photometry: Ubv, Photometry: Ccd

Scientific paper

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.
(1 data file).

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