1998A&A...331..934B


Query : 1998A&A...331..934B

1998A&A...331..934B - Astronomy and Astrophysics, volume 331, 934-948 (1998/3-3)

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

BUSER R., RONG J. and KARAALI S.

Abstract (from CDS):

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±0.15kpc, and mean metallicity <[M/H]≳-0.6 dex with dispersion σ<[M/H]>∼0.4dex. However, because the present data cannot exclude the existence of a vertical metallicity gradient d[M/H]/dz~-0.10±0.10dex/kpc, a sharper picture of the thick disk metallicity structure must await the analysis of the full-survey data in 14 fields.

Abstract Copyright:

Journal keyword(s): Galaxy: abundances - Galaxy: general - Galaxy: stellar content - Galaxy: structure

Simbad objects: 15

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Number of rows : 15
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 NGC 104 GlC 00 24 05.359 -72 04 53.20   5.78 4.09     ~ 3723 0
2 SA 141- reg 01 07 -29.3           ~ 26 0
3 SA 94- reg 02 55 58.10 +00 30 03.6           ~ 45 0
4 SA 71- reg 03 17 11.50 +15 24 57.6           ~ 20 0
5 SA 51- reg 07 30 +29.8           ~ 17 0
6 NGC 2632 OpC 08 40 13 +19 37.3           ~ 1385 0
7 NGC 2682 OpC 08 51 23 +11 48.8           ~ 2174 0
8 SA 54- reg 10 30 +29.5           ~ 15 0
9 SA 57- reg 13 08 38 +29 23.1           ~ 179 0
10 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 2702 2
11 SA 82- reg 14 18 +14.9           ~ 14 0
12 M 5 GlC 15 18 33.22 +02 04 51.7   7.34 5.95     ~ 1872 0
13 SA 107- reg 15 39.2 -00 20           ~ 89 0
14 M 107 GlC 16 32 31.86 -13 03 13.6   9.96 8.85     ~ 744 0
15 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 1997 0

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2022.05.28-23:07:12

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