J/AJ/131/431 Abundances of Galactic G dwarfs (Brewer+, 2006)
A comparison of the chemical evolutionary histories of the galactic thin disk
and thick disk stellar populations.
Brewer M.-M, Carney B.W.
<Astron. J. 131, 431 (2006)>
=2006AJ....131..431B 2006AJ....131..431B
ADC_Keywords: Abundances ; Photometry, uvby, beta ; Radial velocities ;
Space velocities ; Stars, dwarfs
Keywords: disk - Galaxy: evolution - stars: abundances
Abstract:
We have studied 23 long-lived G dwarfs that belong to the thin disk
and thick disk stellar populations. The stellar data and analyses are
identical, reducing the chances for systematic errors in the
comparisons of the chemical abundance patterns in the two populations.
Abundances have been derived for 24 elements: O, Na, Mg, Al, Si, Ca,
Ti, Sc, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Sr, Y, Zr, Ba, La, Ce, Nd, and
Eu.
Description:
We obtained high-resolution echelle spectra for each star. The
majority of the data was taken with the echelle spectrograph on the 4m
Mayall Telescope at Kitt Peak. To obtain the necessary large
wavelength range, each star was observed with two different setups,
one for the red end of the spectrum and one for the blue end. Higher
resolution (R=60,000) spectra were also acquired by I. Ivans using the
2.7m Harlan J. Smith Telescope at McDonald Observatory using the
2d-coude echelle.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 53 23 Radial velocities
table2.dat 62 23 Photometric data
table3.dat 49 23 Photometric temperatures and kinematics
table5.dat 85 23 Observational data
table6.dat 64 23 Atmospheric parameters
table10.dat 38 241 Abundances - Thin disk stars
table11.dat 38 370 Abundances - Thick disk stars
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See also:
J/A+A/410/527 : Abundances in the Galactic disk (Bensby+, 2003)
J/A+A/415/155 : Oxygen abundances in the Galactic disk (Bensby+, 2004)
J/A+AS/102/89 : uvby-beta Photometry of G5 stars (Olsen 1993)
J/AJ/109/1095 : Thick Disk Chemical Abundance Distribution (Gilmore+ 1995)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Name Name
13- 14 I2 --- Nobs Number of observations
16- 19 I4 d Span Span of observations
21- 25 F5.1 km/s RV Mean radial velocity
27- 29 F3.1 km/s e_RV Error in RV
31- 34 F4.1 km/s eERV External error E of mean velocity (1)
36- 38 F3.1 km/s eIRV Internal error I of mean velocity (2)
40- 43 F4.1 --- eERV/eIRV Ratio E/I (3)
45- 52 F8.6 --- P(chi2) Probability of constant RV
53 A1 --- n_P(chi2) Note on P(chi2) (4)
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Note (1): External error derived from the individual velocities.
Note (2): Internal error estimated from the ratio of the height of the
peak in the power spectrum to the mean noise level.
Note (3): Values above 1.5 generally indicate velocity variability.
Note (4): Note on P(chi2), defined as follows:
a = A single-lined spectroscopic binary, with P=1402days.
b = A possible single-lined spectroscopic binary, with an undetermined
orbital period.
c = A single-lined spectroscopic binary, with P=742days.
d = A double-lined spectroscopic binary, with P=23.58days.
e = A single-lined spectroscopic binary, with an undetermined but long
orbital period.
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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 Object name
13- 18 I6 --- HD HD name
20- 23 F4.2 mag VmagL Literature V magnitude
25- 29 F5.3 mag b-y b-y color index
31- 35 F5.3 mag m1 Stroemgren m1 index
37- 41 F5.3 mag c1 Stroemgren c1 index
43- 47 F5.3 mag beta ? Stroemgren β index
49- 52 F4.2 mag Kmag 2MASS K magnitude
54- 57 F4.2 mag J-K 2MASS J-K color index
59- 62 F4.2 mag V-K V-K color index
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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 Object name
13- 17 F5.2 [Sun] [Fe/H] Photometric metallicity estimate
19- 22 I4 K T(b-y) Effective temperature derived from b-y
24- 27 I4 K T(V-K) Effective temperature derived from V-K
29- 31 I3 km/s Uvel U space velocity
33- 35 I3 km/s Vvel V space velocity
37- 39 I3 km/s Wvel W space velocity
41- 44 F4.2 % thin Thin disk membership probability
46- 49 F4.2 % thick Thick disk membership probability
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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 Object name
13- 14 I2 h RAh Hour of Right Ascension (J2000.0)
16- 17 I2 min RAm Minute of Right Ascension (J2000.0)
19- 23 F5.2 s RAs Second of Right Ascension (J2000.0)
25 A1 --- DE- Sign of the Declination (J2000.0)
26- 27 I2 deg DEd Degree of Declination (J2000.0)
29- 30 I2 arcmin DEm Arcminute of Declination (J2000.0)
32- 35 F4.1 arcsec DEs Arcsecond of Declination (J2000.0)
37- 40 F4.2 mag Vmag Observed V magnitude
42- 48 A7 "YYYY/MM" RDate Red exposure date
50- 51 I2 min RExp Red exposure time
53- 55 I3 --- RS/N Red signal-to-noise ratio (1)
57- 63 A7 "YYYY/MM" BDate Blue exposure date
65- 66 I2 min BExp Blue exposure time
68- 70 I3 --- BS/N Blue signal to noise ratio (1)
72- 78 A7 "YYYY/MM" BDate2 Second blue exposure date
80- 81 I2 min BExp2 ? Second blue exposure time
83- 85 I3 --- BS/N2 ? Second blue signal to noise ratio (1)
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Note (1): The S/N level cited is per resolution element. A spectroscopic
resolution element covers 2 pixels. In the red, the reference
wavelength is 6645Å, and in the blue it is 4130Å.
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Name Object name
13- 16 I4 K Teff Effective temperature
18- 21 F4.1 [Sun] [M/H] Metallicity
23- 26 F4.2 km/s Vturb Microturbulent velocity
28- 31 F4.2 [cm/s2] log(g) Surface gravity
33- 38 F6.3 [Sun] [FeI/H] Derived FeI abundance
40- 42 I3 --- N1 Number of absorption lines
44- 48 F5.3 [Sun] e_[FeI/H] Error in [FeI/H] (1)
50- 55 F6.3 [Sun] [FeII/H] Derived FeII abundance
57- 58 I2 --- N2 Number of abundance lines
60- 64 F5.3 [Sun] e_[FeII/H] Error in [FeII/H] (1)
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Note (1): Standard deviation of the abundances from individual absorption lines
from the mean abundance.
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Byte-by-byte Description of file: table10.dat table11.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Name Object name
13- 21 A9 --- Element Element
23- 28 F6.3 [Sun] Abundance Abundance value
30- 34 F5.3 [Sun] e_Abundance ? The 1σ error in Abundance
36- 38 I3 --- o_Abundance ? Number of lines used to derive Name
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 07-Nov-2006