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High-latitude survey of the Galaxy by homogeneous RGU photometry by R. Buser; J. Rong is a Physics and Astronomy article available to read on EtoBox.

What is High-latitude survey of the Galaxy by homogeneous RGU photometry about?

A new homogeneous catalog of photographic RGU star count and color data in seven high-galactic latitude fields has been used to determine the best-fitting structural parameter values from a large number of multi-component population models of the Galaxy. We confirm the presence of a prominent thick disk component coexisting with a canonical thin disk and a low-density spheroidal halo. We find that the thick disk has an exponential scale length of 4.25 ± 1.5 kpc, exponential scale height of 1.15 ± 0.25 kpc, and a local density of 5.4 ± 1.5% relative to the (old) thin disk population. For the thick disk, our best model fitting to the observed color distributions provide a mean metallicity ([M/H]) = -0.6±0.1 dex and a minor vertical metallicity gradient of the order of a[M/H]/Sz = -0.1 dex/kpc. The observed color distributions are consistent with the (old) thin disk having mean abundance ([M/H]) and dispersion C([M/H]) -0.32±0.24 dex and vertical metallicity gradient 9[M/H]/SZ= -0.6 dex/kpc. These results are in good agreement with recent evidence from detailed studies of kinematic and chemical data for smaller, and more local, stellar samples.

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Author

R. Buser; J. Rong

Published

1995

Language

EN

Field

Physics and Astronomy (Physical Sciences)