Chemical evolution of the galactic disk and the radial metallicity gradient

Details Chemical evolution of the galactic disk and the radial metallicity gradient Chemical evolution of the galactic disk and the radial metallicity gradient

Apr 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976a%26a....48..301m&link_type=abstract

Astronomy and Astrophysics, vol. 48, no. 2, Apr. 1976, p. 301-315. Research supported by the Fonds National Suisse de la Recher

Astronomy and Astrophysics

Astrophysics

103

Dwarf Stars, Galactic Evolution, Stellar Structure, Ubv Spectra, Astronomical Spectroscopy, Chemical Composition, F Stars, G Stars, Galactic Structure, K Stars

Scientific paper

Heavy-element enrichment during the evolution of the Galaxy is examined using uvby-beta photometric results for 600 dwarf F stars. Two kinematic methods suitable for determining the local value of the galactic chemical gradient are discussed and applied to the sample of F dwarfs as well as to a sample of 600 G and K giants. The problem of the real metallicity gradient for stars having the same age and birthplace is investigated, the observed chemical gradient is compared with the temporal evolution of the mean metallicity, and the metal-content variation perpendicular to the galactic disk is estimated. It is found that the weighted mean of the chemical gradient in the Galaxy is about -0.05 per kpc; if only stars with orbits having eccentricities of 0.05 to 0.15 are considered, the gradient becomes approximately -0.10 per kpc. The difference between mean metallicity in the galactic plane and at 500 pc above or below it is estimated to be about a factor of two.

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