J/A+AS/124/13 UBVRI photometry of the cluster Collinder 272 (Vazquez+ 1997) ================================================================================ UBVRI imaging photometry of the open cluster Cr 272 Vazquez R.A., Baume G., Feinstein A., Prado P. =1997A&AS..124...13V (SIMBAD/NED BibCode) ================================================================================ ADC_Keywords: Photometry, UBVRI ; Clusters, open Keywords: cluster: open: individual: Cr 272 - stars: luminosity function, mass function - HR diagram Description: 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. Objects: ------------------------------------------------------------ RA (2000) DE Designation(s) ------------------------------------------------------------ 13 30.6 -61 16 Cr 272 = Collinder 272 = C 1327-610 ------------------------------------------------------------ File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table2 61 1201 CCD photometric observations in Cr272 table2.tex 114 1681 LaTeX version of Table 2 -------------------------------------------------------------------------------- Byte-by-byte Description of file: table2 -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 4 I4 --- No Sequence number 6- 11 F6.1 pix Xpos X position 13- 18 F6.1 pix Ypos Y position 20- 24 F5.2 mag Vmag V magnitude 25- 26 A2 --- u_Vmag [: ] Uncertainty flag on Vmag (1) 28- 32 F5.2 mag B-V B-V color index 33- 34 A2 --- u_B-V [: ] Uncertainty flag on B-V (1) 36- 40 F5.2 mag U-B ? U-B color index 41- 42 A2 --- u_U-B [: ] Uncertainty flag on U-B (1) 44- 48 F5.2 mag V-R ? V-R color index 49- 50 A2 --- u_V-R [: ] Uncertainty flag on V-R (1) 52- 56 F5.2 mag V-I ? V-I color index 57- 58 A2 --- u_V-I [: ] Uncertainty flag on V-I (1) 60- 61 A2 --- Rem Remark (2) -------------------------------------------------------------------------------- Note (1): (:) errors larger than 0.04 (::) errors larger than 0.08 Note (2): lm = likely member pm = probable member -------------------------------------------------------------------------------- Acknowledgements: Ruben Vazquez ================================================================================ (End) Ruben Vazquez [Observ. Astron. La Plata] 17-Jan-1997