Abstract
ABSTRA C T We report on UBVRI CCD photometry of two overlapping fields in the region of the intermediate-age open cluster NGC 2158 down to Va 21. By analysing colour ‐colour (CC) and colour ‐magnitude diagrams (CMDs) we infer a reddening EOB 2 VUa0:55 ^ 0:10, a distance of 3600 ^ 400 pc, and an age of about 2 Gyr. Synthetic CMDs constructed with these parameters (but fixing EOB 2 VUa0:60 andâFe=Haa20:60U, and including binaries, field contamination and photometric errors, yield a good description of the observed CMD. The elongated shape of the clump of red giants in the CMD is interpreted as resulting from a differential reddening of about DEOB 2 VUa0:06 across the cluster, in the direction perpendicular to the Galactic plane. NGC 2158 turns out to be an intermediate-age open cluster with an anomalously low metal content. The combination of these parameters, together with the analysis of the cluster orbit, suggests that the cluster belongs to the old thin disc population.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
