1995BaltA...4....1B -
Baltic Astronomy, 4, 1-24 (1995/September-0)
High-latitude survey of the Galaxy by homogeneous RGU photometry.
BUSER R. and RONG J.
Abstract (from CDS):
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. to 6mm 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. to 6mm 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 d[M/H]/dz = -0.1 dex/kpc. The observed color distributions are consistent with the (old) thin disk having mean abundance <[M/H]> and dispersion σ<[M/H]> of -0.32±0.24 dex and vertical metallicity gradient d[M/H]/dz = -0.6 dex/kpc. to 6mm These results are in good agreement with recent evidence from detailed studies of kinematic and chemical data for smaller, and more local, stellar samples.
Abstract Copyright:
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Journal keyword(s):
Galaxy: structure - Galaxy: stellar populations - Galaxy: metallicity distribution
Simbad objects:
8
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