J/ApJ/743/140 Abundances (Be,α) in metal-poor stars (Boesgaard+, 2011)
Beryllium and alpha-element abundances in a large sample of metal-poor stars.
Boesgaard A.M., Rich J.A., Levesque E.M., Bowler B.P.
<Astrophys. J., 743, 140 (2011)>
=2011ApJ...743..140B 2011ApJ...743..140B
ADC_Keywords: Abundances ; Equivalent widths ; Stars, metal-deficient ;
Radial velocities
Keywords: Galaxy: disk - Galaxy: halo - stars: abundances - stars: evolution -
stars: late-type - stars: Population II
Abstract:
The light elements, Li, Be, and B, provide tracers for many aspects
of astronomy including stellar structure, Galactic evolution, and
cosmology. We have made observations of Be in 117 metal-poor stars
ranging in metallicity from [Fe/H]=-0.5 to -3.5 with Keck I/HIRES.
Our spectra are high resolution (∼42000) and high signal to noise (the
median is 106 per pixel). We have determined the stellar parameters
spectroscopically from lines of FeI, FeII, TiI, and TiII. The
abundances of Be and O were derived by spectrum synthesis techniques,
while abundances of Fe, Ti, and Mg were found from many spectral line
measurements. We have kinematic information on 114 stars in our sample
and they divide equally into dissipative and accretive stars.
Description:
Altogether we obtained data on 15 nights between 2004 September and
2010 July with the HIRES instrument on Keck I.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 58 117 Stellar parameters and abundances
table3.dat 45 117 Stellar abundances of Ti, Mg, and Li
table5.dat 73 117 Kinematic properties
ew.dat 34 10626 Measured equivalent widths (table 6)
refs.dat 142 31 References
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See also:
V/130 : Geneva-Copenhagen Survey of Solar neighbourhood III (Holmberg+, 2009)
J/PASP/124/164 : Lithium measurements in metal-poor stars (Schaeuble+, 2012)
J/A+A/522/A26 : Fe Abundances in metal-poor stars (Sbordone+ 2010)
J/A+A/445/939 : Metal-poor stars uvby-beta photometry. XI. (Schuster+, 2006)
J/MNRAS/367/1329 : Elemental abundances for 176 stars (Reddy+, 2006)
J/A+A/438/139 : Abundances in Milky Way's disk (Soubiran+, 2005)
J/A+A/442/961 : Lithium content of the Galactic Halo stars (Charbonnel+, 2005)
J/AZh/82/453 : Cat. of spectroscopic abundances in stars (Borkova+, 2005)
J/PAZh/30/173 : Space velocities of solar neighborhood stars (Borkova+, 2004)
J/A+A/418/551 : Galactic disk stars abundances & velocities (Mishenina+, 2004)
J/AJ/128/1177 : Galactic stellar abundances (Venn+, 2004)
J/A+A/371/943 : Lithium abundances for 185 main-sequence stars (Chen+, 2001)
J/A+AS/141/491 : Chemical composition of halo and disk stars (Nissen+, 2000)
J/A+A/319/593 : [Be] abundances in low-metallicity stars (Molaro+ 1997)
J/AJ/107/2240 : Proper motion stars survey. XII. (Carney+, 1994)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Name Star name
13- 16 I4 K Teff Effective temperature
18- 22 F5.2 [Sun] [Fe/H] Abundance of [Fe/H]
24- 27 F4.2 [cm/s2] logg Log of surface gravity
29- 32 F4.2 km/s Vt Micro-turbulent velocity ξ
34 A1 --- l_A(Be) Limt flag on A(Be)
35- 39 F5.2 [-] A(Be) Be abundance
41- 45 F5.2 [Sun] [O/H] ? Abundance of [O/H]
47 A1 --- l_[Be/Fe] Limit flag on [Be/Fe]
48- 52 F5.2 [Sun] [Be/Fe] Abundance of [Be/Fe]
54- 58 F5.2 [Sun] [O/Fe] ? Abundance of [O/Fe]
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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- 11 A11 --- Name Star name
13- 16 I4 K Teff Effective temperature
18- 22 F5.2 [-] [Fe/H] Abundance of [Fe/H]
24- 28 F5.2 [Sun] [Ti/H] ? Abundance of [Ti/H]
30- 34 F5.2 [Sun] [Mg/H] ? Abundance of [Mg/H]
36 A1 --- l_A(Li) Limt flag on A(Li)
37- 40 F4.2 [-] A(Li) ? Li abundance
42- 45 A4 --- r_A(Li) Li reference (see refs.dat file)
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Name Star name
13- 18 F6.1 km/s RV Stellar radial velocity
20- 25 F6.1 km/s Ulsr Ulsr velocity relative to the local
standard of rest (1)
27- 32 F6.1 km/s Vlsr Vlsr velocity relative to the local
standard of rest (1)
34- 39 F6.1 km/s Wlsr Wlsr velocity relative to the local
standard of rest (1)
41- 45 F5.2 kpc Rapo ? The distance to the apogalacticon of the
orbit (Rapo)
47- 51 F5.2 kpc Zmax ? The distance above the Galactic plane Zmax
53- 63 A11 --- Ref Reference(s) for the orbital parameters (see
refs.dat file)
65- 69 F5.1 km/s nuRF The Galactic rest-frame velocities (2)
71- 73 A3 --- Cl [DAR, ] Final classification as dissipative (D),
accretive (A) or accretive/retrograde (A,R) (3)
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Note (1): The UVW velocities have positive U values away from the Galactic
center, positive V values in the direction of the solar motion, and
positive W values paralleling the direction of the north Galactic
pole. To convert these values relative to the local standard of rest,
we used solar values of U☉=-9km/s, V☉=+12km/s, and
W☉=+7km/s.
Note (2): The Galactic rest-frame velocities, νRF, are
[U2+(V+220)2+W2]1/2.
Note (3): classification first proposed by Searle & Zinn (1978ApJ...225..357S 1978ApJ...225..357S)
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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- 11 A11 --- Name Star name (1)
13- 20 F8.3 0.1nm lambda Wavelength λ in Angstroms
22- 26 A5 --- Ion Ion identification
29- 34 F6.2 10-13m EW ? Equivalent width; in mÅ
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Note (1): G 10-4 is Li depleted (Ryan & Deliyannis 1998ApJ...500..398R 1998ApJ...500..398R) and too
cool at 5000K to determine a reliable Be abundance; therefore, this
star is not included in tables 2, 3 and 5.
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- Ref Reference code
6- 24 A19 --- BibCode Bibcode
26- 44 A19 --- Aut Author's name(s)
46-142 A97 --- Comm Comment
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 13-May-2013