Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974veboc...2....1m&link_type=abstract
Veroeff. Astron. Inst. Ruhr-Univ. Bochum, 2, 1 (1974)
Astronomy and Astrophysics
Astronomy
4
Brightness, Milky Way Galaxy, Photographic Plates, Star Clusters, Ubv Spectra, Schmidt Cameras, Stellar Luminosity
Scientific paper
The identification charts and UBV-brightness of about 22000 stars up to a limit of V is approximately 17 m from 14 young star clusters and adjacent fields of the northern Milky Way are discussed. In most cases, the adjacent fields are located symmetrically around each cluster and allow a statistical subtraction from the corresponding cluster region to yield net two-color and color magnitude diagrams. The methods used for reducing iris photometer readings are described. The semiempirical method of Moffat for deriving the calibration curve is completed by considering the scattering effects in the Schmidt system and in the photographic plate for bright stars. The effect of inhomogeneous background blackening by interstellar H2 emission or by scattered light from bright near stars is eliminated by an empirical method.
Moffat Anthony F. J.
Vogt Nicolas
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