uvbyβ photometry of southern clusters. III. The lower main sequence of NGC 6231.

Details uvbyβ photometry of southern clusters. III. The lower main sequence of NGC 6231. uvbyβ photometry of southern clusters. III. The lower main sequence of NGC 6231.

Dec 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983mnras.205.1229s&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. Vol. 205, No. 3, p. 1229 - 1241

Astronomy and Astrophysics

Astronomy

35

Distances:Star Clusters, Photometry:Star Clusters, Reddening:Star Clusters, Star Clusters:Distances, Star Clusters:Photometry, Star Clusters:Reddening

Scientific paper

New uvbyβ photometry is presented for 26 previously unobserved faint members of the very young galactic cluster NGC 6231, and for 24 members which have data already published. The β/V0 relation does not have the same shape as Crawford's β/MV calibration relation and this calibration gives distance moduli for the brighter members which are some 0.6 mag greater than those for the late B stars. It is concluded that the lower envelope of the later B stars in a V0/c0 graph probably represents the zero age main sequence, in which case the uvbyβ and the UBV photometric methods of distance determination may be reconciled for a distance modulus of 11.0, or a distance of 1.6 kpc.

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