UBVI imaging photometry of NGC 6231

Details UBVI imaging photometry of NGC 6231 UBVI imaging photometry of NGC 6231

Jun 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26as..137..233b&link_type=abstract

Astronomy and Astrophysics Supplement, v.137, p.233-244

Astronomy and Astrophysics

Astrophysics

37

Cluster: Open, Individual: Ngc 6231, Stars: Luminosity Function, Mass Function, Hr Diagram

Scientific paper

CCD UBVI photometry in the field of the open cluster NGC 6231 was obtained for 1060 stars down to V~ 19 mag. Memberships, reddening, distance and age of this cluster were investigated. Its lower sequence displays a notorious bend at V~ 13.5 mag followed by a high number of faint stars showing a large magnitude spread at constant colour. This distribution of stars does not seem to be produced by a mere accumulation of field stars seen in the direction of the cluster but by a real star excess in the zone. The evidence suggests these stars are serious candidates to be cluster members caught in their way towards the ZAMS. Fitting them with pre main sequence isochrones an age spread of about 10 Myr is obtained. The luminosity and mass functions were found to be flat for -7.5 < MV < 1.5 and from 3 to 80 {cal Msun} respectively. Based on observations collected at the University of Toronto Southern Observatory, Las Campanas, Chile. Table 1 is available only in electronic form at the CDS via anonymous ftp (130.79.128.5) or via http://cdsweb.u-strasbg.fr/Abstract.html

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