J/A+A/465/799 Abundances of Galactic Bulge red giants (Lecureur+, 2007)
Oxygen, sodium, magnesium, and aluminium as tracers of the Galactic Bulge
formation.
Lecureur A., Hill V., Zoccali M., Barbuy B., Gomez A., Minniti D.,
Ortolani S., Renzini A.
<Astron. Astrophys., 465, 799-814 (2007)>
=2007A&A...465..799L 2007A&A...465..799L
ADC_Keywords: Stars, nearby ; Stars, giant ; Abundances
Keywords: Galaxy: bulge - Galaxy: formation - Galaxy: abundances -
stars: abundances - stars: atmospheres
Abstract:
This paper investigates the peculiar behaviour of the light elements
(even, e.e. alpha-elements, and odd atomic numbers) in red giants of
the galactic bulge, both in terms of the chemical evolution of the
bulge, and in terms of possible deep-mixing mechanisms in these
evolved stars.
Abundances of the four light elements O, Na, Mg, and Al are measured
in 13 core He-burning giant stars (red clump stars) and 40 red giant
branch stars in four 25' fields spanning the bulge from -3 to -12°
galactic latitude. Special care was taken in the abundance analysis,
performing a differential analysis with respect to the metal-rich
solar-neighbourhood giant mu Leo, which best resembles our bulge
sample stars. This approach minimises systematic effects that can
arise in the analysis of cool metal-rich stars due to continuum
definition issues and blending by molecular lines (CN) and, cancels
out possible model atmosphere deficiencies.
Description:
The observations were performed during several runs with the
ESO-VLT-UT2 and the FLAMES (Fibre Large Array Multi-Element
Spectrograph) instrument, and the final dataset combines data
from the GTO program #071.B-0196 with others from the GO programs
#071.B-0617 and #073.B-0074. Details of the observations will be
presented elsewhere (Zoccali et al., in preparation).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 35 58 Adopted stellar parameters and heliocentric
radial velocity for the Bulge sample stars
ew.dat 30 5060 Equivalent widths of FeI lines
(tables 2-6 of the paper)
abund.dat 110 53 Abundances of Fe, O, Mg, Al, Na, C, and N and
from individual Na and Al lines for the
program stars (tables 11 & 12 of the paper)
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- [LHZ2007] Star designation (G1)
7 A1 --- n_[LHZ2007] [*] * for probable disk contaminants
9- 12 I4 K Teff Effective temperature
14- 16 F3.1 [cm/s2] logg Surface gravity
18- 20 F3.1 km/s xi Turbulent velocity
22- 27 F6.1 km/s HRV Heliocentric radial velocity
29- 32 F4.2 % Res Mean DAOSPEC residual (quality indicator)
34- 35 I2 --- S/N Signal-to-noise ratio per 0.017Å/pix around
λ6330Å (quality indicator)
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Byte-by-byte Description of file: ew.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- [LHZ2007] Star designation (G1)
8- 14 F7.2 0.1nm Lambda Fe I Wavelength (Angstroms)
16- 19 F4.2 eV Xiex Lower excitation potential
21- 25 F5.1 0.1pm EW ?=99.99 Equivalent width
27- 30 F4.1 0.1pm e_EW ?=9.99 Error on Equivalent width
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Byte-by-byte Description of file: abund.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- [LHZ2007] Star designation (G1)
8- 12 F5.2 [Sun] [Fe/H] Metallicity
14- 17 F4.2 [Sun] e_[Fe/H] rms uncertainty on [Fe/H]
19- 23 F5.2 [Sun] [O/Fe] Abundance of O, relative to Fe
25 A1 --- q_[O/Fe] [0-2] Quality flag (1)
27- 30 F4.2 [Sun] [Mg/Fe] Abundance of Mg, relative to Fe
32- 35 F4.2 [Sun] e_[Mg/Fe] rms uncertainty on [Mg/Fe]
37- 40 F4.2 [Sun] [Al/Fe] Abundance of Al, relative to Fe
42- 45 F4.2 [Sun] e_[Al/Fe] rms uncertainty on [Al/Fe]
47- 51 F5.2 [Sun] [Na/Fe] Abundance of Na, relative to Fe
53- 56 F4.2 [Sun] e_[Na/Fe] rms uncertainty on [Na/Fe]
58- 62 F5.2 [Sun] [C/Fe] Abundance of C, relative to Fe
64- 67 F4.2 [Sun] [N/Fe] Abundance of N, relative to Fe
69- 72 F4.2 [Sun] [Al/Fe]1 Abundance of 6696Å Al, relative to Fe
74- 77 F4.2 [Sun] e_[Al/Fe]1 rms uncertainty on [Al/Fe]1
79- 83 F5.2 [Sun] [Al/Fe]2 Abundance of 6698Å Al, relative to Fe
85- 88 F4.2 [Sun] e_[Al/Fe]2 rms uncertainty on [Al/Fe]2
90- 94 F5.2 [Sun] [Na/Fe]1 Abundance of 6154Å Na, relative to Fe
96- 99 F4.2 [Sun] e_[Na/Fe]1 rms uncertainty on [Na/Fe]1
101-105 F5.2 [Sun] [Na/Fe]2 Abundance of 6160Å Na, relative to Fe
107-110 F4.2 [Sun] e_[Na/Fe]2 rms uncertainty on [Na/Fe]2
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Note (1): Quality flag as follows:
0 = good measurement
1 = uncertain measurement due to telluric lines in the vicinity or
bad quality fit
2 = no measurement
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Global notes:
Note (G1): List of the fields:
BL-N = Blanco field stars
B6-NN = b=-6 field stars
B3-NN = b=-3 field stars
BW-NN = Baade's window field RGB stars
BWc-NN = Baade's window field Red Clump stars
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 11-Oct-2007