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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
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:
FileName Lrecl Records Explanations
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
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
Bytes Format Units Label Explanations
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)
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.
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
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
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
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
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
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)
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.
Byte-by-byte Description of file: table6.dat
Bytes Format Units Label Explanations
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)
Note (1): Standard deviation of the abundances from individual absorption lines from the mean abundance.
Byte-by-byte Description of file: table10.dat table11.dat
Bytes Format Units Label Explanations
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
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 07-Nov-2006
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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