UBVRI and H-alpha photometry of the young open cluster NGC 6231

Details UBVRI and H-alpha photometry of the young open cluster NGC 6231 UBVRI and H-alpha photometry of the young open cluster NGC 6231

Feb 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aj....115..734s&link_type=abstract

Astronomical Journal, vol. 115, p. 734

Astronomy and Astrophysics

Astronomy

66

Open Clusters, Color-Magnitude Diagram, Early Stars, Astronomical Photometry, H Alpha Line, Charge Coupled Devices, Stellar Luminosity, Color-Color Diagram

Scientific paper

UBVRI and H-alpha CCD photometry has been obtained for the young open cluster NGC 6231. From the R - H-alpha color, a measure of the H-alpha emission, we find 12 pre-main-sequence (PMS) members and seven possible PMS members in the cluster. Applying recent stellar evolutionary tracks and PMS evolutionary tracks, we derive the age, age spread, and initial mass function of the cluster. The initial mass function of NGC 6231 is a Gaussian with a turnover at log m about 0.4 (m about 2.5 solar masses) and shows an abrupt decrease in the number of low-mass stars. Possible reasons for the suppression of low-mass star formation and star formation processes are discussed.

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