J/A+A/449/127 Chemical abundances of 32 mildly metal-poor stars (Zhang+, 2006)
Chemical abundances of 32 mildly metal-poor stars.
Zhang H.W., Zhao G.
<Astron. Astrophys. 449, 127 (2006)>
=2006A&A...449..127Z 2006A&A...449..127Z
ADC_Keywords: Stars, dwarfs ; Stars, metal-deficient ; Abundances, peculiar
Keywords: stars: abundances - stars: kinematics - Galaxy: disk
Abstract:
We present photospheric abundances of the O, Na, Mg, Al, Si, Ca, Sc,
Ti, V, Cr, Mn, Ni, and Ba elements for 32 mildly metal-poor stars with
[Fe/H]~-0.7. High resolution and high signal-to-noise ratio spectra
were obtained with the Coude Echelle Spectrograph mounted on the 2.16m
telescope at the National Astronomical Observatories (Xinglong,
China) on 10 nights during 1999. Effective temperatures were estimated
from colour indices, and surface gravities from Hipparcos parallaxes.
Stellar abundances were determined from a differential LTE analysis.
Our element abundance results extend and confirm previous works. The
oxygen and other alpha-elements (Mg, Si, Ca, and Ti) abundances of
thin and thick disk stars show distinct trends at [Fe/H]←0.60. The
[Al/Fe] behaviour is exactly as an alpha-element, although the
separation for [Na/Fe] of thin and thick disk stars is not clear. The
elements V, Cr, and Ni follow Fe very closely, and there is no offset
between thin and thick disk stars, but the Sc and Mn abundance trends
of the thin and thick disk stars are different, and [Ba/Fe] of thin
disk and thick disk stars shows different behaviour.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
stars.dat 56 32 Star positions and magnitudes (from Simbad)
table1.dat 45 5344 Equivalent widths data
table3.dat 93 32 Abundances
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See also:
J/A+A/440/321 : Chemical abundances in 43 metal-poor stars (Jonsell+, 2005)
J/A+A/425/671 : Equivalent widths of 10 metal-poor halo stars (Bai+, 2004)
J/A+A/404/187 : Equivalent widths for metal-poor stars (Gratton+, 2003)
J/A+A/403/1105 : Extremely metal-poor giants equivalent widths (Francois+ 2003)
J/A+A/390/235 : OI & FeII equivalent widths in metal-poor stars (Nissen+ 2002)
J/A+A/354/169 : Metal-poor field stars abundances (Gratton+, 2000)
J/A+A/305/245 : Fe I in metal-poor stars (Magain+, 1996)
J/A+A/290/885 : Abundances of very metal-poor stars (Primas+, 1994)
Byte-by-byte Description of file: stars.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Star name
12- 13 I2 h RAh Right ascension (J2000.0)
15- 16 I2 min RAm Right ascension (J2000.0)
18- 21 F4.1 s RAs Right ascension (J2000.0)
23 A1 --- DE- Declination sign (J2000.0)
24- 25 I2 deg DEd Declination (J2000.0)
27- 28 I2 arcmin DEm Declination (J2000.0)
30- 31 I2 arcsec DEs Declination (J2000.0)
35- 39 F5.2 mag Bmag B magnitude
41- 45 F5.2 mag Vmag V magnitude
47- 67 A21 --- SpType MK spectral type
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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- 9 A9 --- Name Star name
11- 18 F8.3 0.1nm Lambda Wavelength
20- 21 A2 --- El Element
22 A1 --- Ion Ionisation
25- 28 F4.2 eV LEP Lower excitation potential
30- 35 F6.3 --- loggf log of oscillator strength
37- 39 F3.1 --- Egamma Correction factor to Unsoeld broadening
41- 45 F5.1 0.1pm EW ?=- Equivalent width
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Star name
11- 15 F5.2 [Sun] [Fe/H] Abundance [Fe/H]
17- 21 F5.2 [Sun] [O/Fe] Abundance [O/Fe]
23- 27 F5.2 [Sun] [Mg/Fe] Abundance [Mg/Fe]
29- 33 F5.2 [Sun] [Si/Fe] Abundance [Si/Fe]
35- 39 F5.2 [Sun] [Ca/Fe] Abundance [Ca/Fe]
41- 45 F5.2 [Sun] [Ti/Fe] ? Abundance [Ti/Fe]
47- 51 F5.2 [Sun] [Na/Fe] ? Abundance [Na/Fe]
53- 57 F5.2 [Sun] [Al/Fe] ? Abundance [Al/Fe]
59- 63 F5.2 [Sun] [Sc/Fe] ? Abundance [Sc/Fe]
65- 69 F5.2 [Sun] [V/Fe] ? Abundance [V/Fe]
71- 75 F5.2 [Sun] [Cr/Fe] ? Abundance [Cr/Fe]
77- 81 F5.2 [Sun] [Mn/Fe] ? Abundance [Mn/Fe]
83- 87 F5.2 [Sun] [Ni/Fe] ? Abundance [Ni/Fe]
89- 93 F5.2 [Sun] [Ba/Fe] Abundance [Ba/Fe]
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Acknowledgements: H.W. Zhang, zhw(at)bac.pku.edu.cn
(End) Patricia Vannier [CDS] 02-Dec-2005