Other
Scientific paper
Sep 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980mnras.192..821s&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 192, Sept. 1980, p. 821-840. Research supported by the University of Sy
Other
25
Astrometry, Star Clusters, Stellar Luminosity, Stellar Spectrophotometry, Ubv Spectra, Absorption Spectra, Abundance, Colorimetry, Hertzsprung-Russell Diagram, Interstellar Extinction, Southern Hemisphere, Spectral Emission, Supergiant Stars, Ultraviolet Photometry
Scientific paper
Stromgren uvby photometry has been obtained for 42 members and beta photometry for 37 members of the young southern galactic cluster NGC 3293. The distance modulus obtained from using Crawford's beta/M(V) calibration is 12.75 mag, corresponding to a distance of 3.55 kpc. Comparison of the colour/colour and the HR diagrams of NGC 3293 with those of the five other young northern and southern clusters reveals large differences between the clusters which may possibly be due to metal abundance variations across the Galaxy. Apparently correlated with this effect is a variation of the luminosities of the lower main sequences over about 1 mag. The fainter stars in the southern clusters appear to be an average of 0.7 mag brighter than those in the northern clusters, but it is not certain at present how much of this difference is due to possible systematic errors in the beta index zero point between the northern and southern hemispheres.
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