The chemical abundance gradient in the galaxy derived from an analysis of the H-R diagrams of open clusters

Details The chemical abundance gradient in the galaxy derived from an analysis of the H-R diagrams of open clusters The chemical abundance gradient in the galaxy derived from an analysis of the H-R diagrams of open clusters

Jan 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....81..375p&link_type=abstract

Astronomy and Astrophysics, vol. 81, no. 3, Jan. 1980, p. 375-378.

Astronomy and Astrophysics

Astrophysics

13

Abundance, Gradients, Hertzsprung-Russell Diagram, Milky Way Galaxy, Open Clusters, Chemical Composition, Galactic Structure, Metals

Scientific paper

We have analyzed the H-R diagrams of 17 selected open clusters within ∼2 kpc from the Sun. By fitting the observed diagrams with theoretical isochrones we have estimated the chemical abundance of each cluster. We find that there is a systematic variation of the metal content with the galactic radius which can be expressed as
Δlog(Z/X)/ΔR = -0.098±0.015 kpc-1.
The average metal abundance in the solar neighbourhood is =0.025±0.003 which corresponds to ¯Z=0.018±0.002. Also, we find that the mean abundance of helium is ¯Y=0.267±0.013 by mass or =0.093±0.05 by number. Moreover we determine that a possible gradient of the He abundance must be limited to ΔY/ΔR≦0.012 kpc-1.

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