J/A+AS/124/13 J/A+AS/124/13 UBVRI photometry of the cluster Collinder 272 R A Vazquez G Baume A Feinstein P Prado Astron. Astrophys. Suppl. Ser. 124 13 1997 1997A&AS..124...13V Clusters, open Photometry, UBVRI Hertzsprung-Russell (HR diagram) open clusters and associations: individual (Cr 272) stars: luminosity function, mass function We present an extensive CCD UBVRI (Cousins system) photometric survey in the region of the open cluster Collinder 272. Our data analysis confirms that the cluster is situated in the outer border of Becker's inner arm -II, at a distance d=2300pc and probably related to the neighbor cluster Hogg 16. There is no highly evolved stars in the cluster upper sequence and our age estimate based upon isochrones from models computed with mass loss and overshooting, and other methods, indicates a mean age of 13Myr. A statistical method based on the removal of field stars was used to determine the luminosity function and the initial mass function of the cluster. The cluster initial mass function is characterized by a slope x=1.8.

Cr 272Collinder 272C 1327-61013 30.6 -61 16

No Sequence number --- Xpos X position pix Ypos Y position pix Vmag V magnitude mag u_Vmag Uncertainty flag on Vmag number=1 (:) errors larger than 0.04 (::) errors larger than 0.08 --- B-V B-V color index mag u_B-V Uncertainty flag on B-V number=1 (:) errors larger than 0.04 (::) errors larger than 0.08 --- U-B U-B color index mag u_U-B Uncertainty flag on U-B number=1 (:) errors larger than 0.04 (::) errors larger than 0.08 --- V-R V-R color index mag u_V-R Uncertainty flag on V-R number=1 (:) errors larger than 0.04 (::) errors larger than 0.08 --- V-I V-I color index mag u_V-I Uncertainty flag on V-I number=1 (:) errors larger than 0.04 (::) errors larger than 0.08 --- Rem Remark number=2 lm = likely member pm = probable member --- table2.texLaTeX version of Table 2 Ruben Vazquez Observ. Astron. La Plata 1997Jan17Ruben Vazquez <rvazquez@fcaglp.fcaglp.unlp.edu.ar> J_A+AS_124_13.xml