Geneva photometry in NGC 6231 (Raboud+ 1997)

Details Geneva photometry in NGC 6231 (Raboud+ 1997) Geneva photometry in NGC 6231 (Raboud+ 1997)

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997ycat..33250167r&link_type=abstract

VizieR On-line Data Catalog: J/A+A/325/167. Originally published in: 1997A&A...325..167R

Physics

Clusters: Open, Photometry: Geneva

Scientific paper

We present photoelectric (127 stars) and CCD (168 stars) Geneva photometry for the very young open cluster NGC 6231. We have searched for new cluster members out to a distance of ~13arcmin, extending the Seggewiss area (~8arcmin), and we found at least 64 new probable members in this extended field. Differential reddening is clearly measured across the cluster area. We determine the cluster distance (1800pc) and age (3.8+/-0.6x106yr). The probable presence of pre-main sequence stars and the consequence of this population on the cluster formation history is analysed. We also found that the O8.5III star S161 is a long term variable and we present its light curve extending over more than 20 years. Finally we discuss the existence of Ap stars in the cluster.
For a description of the Geneva photometric system, see e.g.
(3 data files).

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