J/MNRAS/275/591 Outer regions of Galactic Bulge (Ibata+, 1995)
The Outer Regions of the Galactic Bulge: I. Observations.
IBATA R.A., GILMORE G.
<Mon. Not. R. Astron. Soc. 275, 591 (1995)>
=1995MNRAS.275..591I 1995MNRAS.275..591I (SIMBAD/NED Reference)
ADC_Keywords: Photometry, photographic ; Radial velocities ; Abundances, [Fe/H]
Keywords: stars: abundances - stars: Population II - Galaxy: abundances -
Galaxy: kinematics and dynamics - Galaxy: stellar content -
galaxies: evolution
Description:
Digitized UK Schmidt plate photometry, calibrated with CCD photometry,
is obtained in 18 regions over the Bulge. Stars are selected for
spectroscopic follow-up from with a carefully chosen colour-magnitude
window, optimized for efficient detection of bulge K giants. Some 1500
stellar spectra are obtained with the AAT AUTOFIB facility. We derive
a radial velocity and metallicity for each star, and quantify the
uncertainties in these measurements. Luminosity classification is
derived both by visual classification and by using an automated
routine based on Principal Component Analysis. There are two basic
results from this survey: the discovery of the Sagittarius dwarf
galaxy described by Ibata, Gilmore and Irwin (1994Natur.370..194I 1994Natur.370..194I),
and a study of the Galactic Bulge by Ibata and Gilmore
(1995MNRAS.275..605I 1995MNRAS.275..605I)
The catalogue contains coordinates, photometry, radial velocities,
luminosity classification and chemical abundances for approximately
1500 stars in lines of sight towards the Galactic Bulge.
A detailed description of the selection of these stars, the methods
used to derive the data, and the reliability of the data, is presented
in the paper.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
main 77 1509 The resulting catalogue
obs 28 1851 Individual observations
--------------------------------------------------------------------------------
Byte-by-byte Description of file: main
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 A6 --- Name Star Name
9- 10 I2 h RAh Right Ascension B1950 (hours)
12- 13 I2 min RAm Right Ascension B1950 (minutes)
15- 19 F5.2 s RAs Right Ascension B1950 (seconds)
21 A1 --- DE- Declination B1950 (sign)
22- 23 I2 deg DEd Declination B1950 (degrees)
25- 26 I2 arcmin DEm Declination B1950 (minutes)
28- 31 F4.1 arcsec DEs Declination B1950 (seconds)
34- 39 F6.2 deg GLON Galactic longitude
41- 46 F6.2 deg GLAT Galactic latitude
48- 52 F5.2 mag B-R ? Photographic photometric colour
55- 59 F5.2 mag Rmag [14/16]? R-band photographic magnitude
62- 67 F6.1 km/s RVel Mean heliocentric velocity
70 A1 --- SpClass [dKMC] spectral class (1)
73- 77 F5.2 Sun [Fe/H] ? mean [Fe/H] where repeat data exist
--------------------------------------------------------------------------------
Note (1): d=dwarf, K=K giant, M=M giant, C=Carbon
--------------------------------------------------------------------------------
Byte-by-byte Description of file: obs
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 A6 --- Name star name
9- 10 I2 --- Obs [89/93] Year of spectroscopic observation
(offset 1900)
13- 18 F6.1 km/s RVel Measured heliocentric velocity
21 A1 --- SpClass [dKMC] spectral class (1)
24- 28 F5.2 Sun [Fe/H] ? Derived metallicity [Fe/H]
--------------------------------------------------------------------------------
Note (1): d=dwarf, K=K giant, M=M giant, C=Carbon
--------------------------------------------------------------------------------
Courtesy: Gerry Gilmore
(End) Gerry Gilmore [ROE], Francois Ochsenbein [CDS] 15-Mar-1995