UBVI CCD Photometry of Young Open Clusters. II. Bochum 7

Details UBVI CCD Photometry of Young Open Clusters. II. Bochum 7 UBVI CCD Photometry of Young Open Clusters. II. Bochum 7

Oct 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999jkas...32..109s&link_type=abstract

Journal of the Korean Astronomical Society, vol. 32, no. 2, pp. 109-117

Astronomy and Astrophysics

Astronomy

3

Color-Magnitude Diagrams (H-R Diagram), Open Clusters And Associations: Individual (Bo 7), Stars: Early-Type, Initial Mass Function(Imf)

Scientific paper

UBVI CCD photometry has been obtained for a region around the Wolf-Rayet star WR 12. We found two young stellar associations in the observed field: the nearer one comprises the field members of Vela OB1 association at d = 1.8kpc, while the farther one is the young open cluster Bochum 7 (Bo 7) at d = 4.8kpc. The stars associated with Bo 7 showed no central concentration which suggests that Bo 7 is not a young open cluster but simply a local concentration in the density of young stars belonging to the OB association (Vel OB3). These two associations have similar ages but remarkably different mass function slopes (Gamma = -2.1 +/- 0.3 for Vel OB1 and -1.0 +/- 0.3 for Bo 7). The stars in Vel OB1 shows an evident age spread (Delta tau 9Myr). We also found two strong Hα emission stars - WR 12 and #1066 - from narrow band H alpha photometry.

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