J/A+A/584/A46 GIRAFFE Inner Bulge Survey (GIBS). II. (Gonzalez+, 2015)
The Giraffe Inner Bulge Survey (GIBS).
II. Metallicity distributions and alpha element abundances at fixed Galactic
latitude.
Gonzalez O.A., Zoccali M., Vasquez S., Hill V., Rejkuba M., Valenti E.,
Rojas-Arriagada A., Renzini A., Babusiaux C., Minniti D., Brown T.
<Astron. Astrophys. 584, A46 (2015)>
=2015A&A...584A..46G 2015A&A...584A..46G (SIMBAD/NED BibCode)
ADC_Keywords: Milky Way ; Abundances ; Photometry ; Effective temperatures
Keywords: Galaxy: bulge - Galaxy: abundances - Galaxy: formation -
Galaxy: evolution
Abstract:
We investigate metallicity and α-element abundance gradients along a
Galactic longitude strip, at latitude b~-4°, with the aim of
providing observational constraints for the structure and origin of
the Milky Way bulge.
High-resolution (R∼22500) spectra for 400 Kgiants, in four fields
within -4.8°≲b≲-3.4° and -10°≲l≲+10°, were
obtained within the GIRAFFE Inner Bulge Survey (GIBS) project. To this
sample we added another ∼400 stars in Baade's Window at
(l,b)=(1°,-4°), observed with the identical instrumental
configuration: FLAMES GIRAFFE in Medusa mode with HR13 setup. All
target stars lie within the red clump of the bulge colour-magnitude
diagram, thus minimising contamination from the disc or halo stars.
The spectroscopic stellar surface parameters were derived with an
automatic method based on the GALA code, while the [Ca/Fe] and [Mg/Fe]
abundances as a function of [Fe/H] were derived through a comparison
with the synthetic spectra using MOOG. We constructed the metallicity
distributions for the entire sample, and for each field individually,
in order to investigate the presence of gradients or field-to-field
variations in the shape of the distributions.
Description:
Coordinates, VIJHKs photometry, stellar surface parameters, [Fe/H],
[Mg/Fe] and [Ca/Fe] abundance ratios for a sample of 400 red clump
stars in the four high-resolution GIBS fields. The spectroscopic
stellar surface parameters were derived with an automatic method based
on the GALA code, while the [Ca/Fe] and [Mg/Fe] abundances as a
function of[Fe/H] were derived through a comparison with the synthetic
spectra using MOOG.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 123 400 Stellar parameters, [Fe/H], [Mg/Fe], and [Ca/Fe]
abundance ratios for stars in the four
high-resolution GIBS fields
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See also:
J/AJ/110/2788 : JHK photometry for Galactic bulge stars (Tiede+ 1995)
J/MNRAS/348/1439 : OGLE II Galactic center proper motions (Sumi+, 2004)
J/A+A/458/113 : BVRIc phot. towards inner Galactic Bulge (Santiago+, 2006)
J/ApJ/721/L28 : OGLE-III red clump stars in Galactic Bulge (Nataf+, 2010)
J/A+A/534/A91 : Galactic Bulge Valinhos Observatory Catalog (Teixeira+ 2011)
J/A+A/555/A91 : Kinematics and photometry of red clump stars (Vasquez+ 2013)
J/A+A/562/A66 : GIRAFFE Inner Bulge Survey (GIBS). I. (Zoccali+, 2014)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- Field Field name
8- 11 I4 --- GIBS Target name (1)
13- 14 I2 h RAh Right ascension (J2000)
16- 17 I2 min RAm Right ascension (J2000)
19- 24 F6.3 s RAs Right ascension (J2000)
26 A1 --- DE- Declination sign
27- 28 I2 deg DEd Declination (J2000)
30- 31 I2 arcmin DEm Declination (J2000)
33- 37 F5.2 arcsec DEs Declination (J2000)
39- 43 F5.2 mag Imag OGLE I-band magnitude
45- 49 F5.2 mag Vmag OGLE V-band magnitude
51- 55 F5.2 mag Jmag VVV J-band magnitude
57- 61 F5.2 mag Hmag VVV J-band magnitude
63- 67 F5.2 mag Ksmag VVV Ks-band magnitude
69- 72 I4 K Teff Effective temperature
74- 76 I3 K e_Teff Error on effective Temperature
78- 80 F3.1 km/s Vt Microturbulence velocity
82- 85 F4.2 km/s e_Vt Error on microturbulence velocity
87- 90 F4.2 [cm/s2] logg Surface gravity
92- 96 F5.2 [Sun] [Fe/H] Metallicity
98-101 F4.2 [Sun] e_[Fe/H] Error on metallicity
103-107 F5.2 [Sun] [Ca/Fe] Abundance ratio, [Ca/Fe]
109-112 F4.2 [Sun] e_[Ca/Fe] Error on abundance ratio [Ca/Fe]
114-118 F5.2 [Sun] [Mg/Fe] Abundance ratio, [Mg/Fe]
120-123 F4.2 [Sun] e_[Mg/Fe] Error on abundance ratio [Mg/Fe]
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Note (1): Target names correspond to those published in GIBS. I paper
(Zoccali et al. 2014, Cat. J/A+A/562/A66). Will be GIBS NNNN in Simbad.
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Acknowledgements:
Oscar Gonzalez, ogonzale(at)eso.org
References:
Zoccali et al., Paper I 2014A&A...562A..66Z 2014A&A...562A..66Z, Cat. J/A+A/562/A66
(End) Oscar Gonzalez [ESO], Patricia Vannier [CDS] 24-Sep-2015