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The Hipparcos distances of open clusters and their implication on the local variations of the ΔY/ΔZ ratio.

Zinnecker, H.; Schilbach, E.; Efremov, Yu. N.

Arguments are collected to demonstrate that recent Hipparcos results on the distances of open clusters are in agreement with previous estimates in the Russian literature which have pointed to a shorter distance scale. Evidence of the absence of a universal correlation between helium and metal abundances is given. It is suggested that violations of…