On the abundance structure of the inner galactic halo - A preliminary report

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Abundance, Dwarf Stars, Halos, G Stars, Galactic Evolution, Gravitational Collapse, Metals, Statistical Analysis, Stellar Magnitude, Ultraviolet Radiation

Scientific paper

A preliminary statistical investigation is presented determining mean metal abundances of dwarf stars at different distances and in several halo directions, based on the Basle photographic halo survey using the RGU system. Metallicities are estimated from UV-excesses of a well defined sample of stars (F 8-G 5 dwarfs). Adopting approximate absolute magnitudes, we estimate abundance gradients in the inner galactic halo to a limiting distance of about 6 kpc from the sun. The resulting iso-abundance contours seem to be flattened, consistent with predictions of collapse models of galaxy formation. Their flattening is quite similar to that of iso-density lines as determined previously in the Basle halo program.

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