Metallicities and distances of galactic clusters as determined from UBV-data. II - The metallicities and distances of 38 open clusters. III - Ages and abundance gradients of open clusters

Details Metallicities and distances of galactic clusters as determined from UBV-data. II - The metallicities and distances of 38 open clusters. III - Ages and abundance gradients of open clusters Metallicities and distances of galactic clusters as determined from UBV-data. II - The metallicities and distances of 38 open clusters. III - Ages and abundance gradients of open clusters

Jun 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...147...39c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 147, no. 1, June 1985, p. 39-53.

Astronomy and Astrophysics

Astrophysics

58

Abundance, Chemical Evolution, Color-Magnitude Diagram, Metallicity, Open Clusters, Ubv Spectra, Distance, Galactic Structure, Interstellar Extinction, Iron, Main Sequence Stars, Stellar Evolution

Scientific paper

After presenting a novel method for the simultaneous calculation of UV excess and reddening in open clusters, the former is transformed into an Fe/H abundance ratio value on the basis of the relation due to Cameron (1985), and the reddening is used to determine the distances of the clusters, incorporating a ratio of total-to-selective absorption that is both a function of interstellar extinction and dependent on spectral type. Metallicities and distances for 38 open clusters are thereby obtained and used to estimate the variation of metal abundance along the galactic disk. The ages of the clusters are determined using the turnoff point method in the H-R diagram, and noted to cover a span of 5.1 billion years. No firm relationship between cluster ages and their metallicity can be deduced; it is instead shown that, at a given age, there is a metallicity spread of up to + or - 0.3 dex.

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