The new Basel high-latitude field star survey of the Galaxy. I. General introduction, methodology and first analysis

Details The new Basel high-latitude field star survey of the Galaxy. I. General introduction, methodology and first analysis The new Basel high-latitude field star survey of the Galaxy. I. General introduction, methodology and first analysis

Mar 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...331..934b&link_type=abstract

Astronomy and Astrophysics, v.331, p.934-948 (1998)

Astronomy and Astrophysics

Astrophysics

36

Galaxy: Abundances, Galaxy: General, Galaxy: Stellar Content, Galaxy: Structure

Scientific paper

This is the first in a series of papers devoted to the determination of Galactic structure from the new homogeneous catalog of photographic RGU field star data in fourteen high-latitude directions. We give a general description of the motivation for this work, the construction of the observational data base, and the structural Galaxy models designed for its analysis. In particular, we provide a concise yet comprehensive account of the statistical methodology used for determining reliable constraints to the model parameters. Preliminary results obtained from the first-half sample of seven fields are discussed to demonstrate the significance of the approach. Our best models suggest that the thick disk component has a local density of 5.4 +/- 1.5% relative to the thin disk, an exponential scale height of 1.15 +/- 0.15 kpc, and mean metallicity < [M/H] > ~ -0.6 dex with dispersion sigma_ {< [M/H] >} ~ 0.4 dex. However, because the present data cannot exclude the existence of a vertical metallicity gradient partial [M/H]/partial z ~ -0.10 +/- 0.10 dex/kpc, a sharper picture of the thick disk metallicity structure must await the analysis of the full-survey data in 14 fields.

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