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J/A+A/465/271       Oxygen abundances in nearby stars        (Ramirez+, 2007)

Oxygen abundances in nearby stars. Clues to the formation and evolution of the Galactic disk. Ramirez, I., Allende Prieto, C., Lambert, D.L. <Astron. Astrophys. 465, 271 (2007)> =2007A&A...465..271R
ADC_Keywords: Stars, nearby ; Radial velocities ; Space velocities ; Abundances Keywords: stars: abundances - stars: atmospheres - stars: fundamental parameters - Galaxy: disk Abstract: The abundances of iron and oxygen are homogeneously determined in a sample of 523 nearby (d<150pc) FGK disk and halo stars with metallicities in the range -1.5<[Fe/H]<0.5. Iron abundances were obtained from an LTE analysis of a large set of FeI and FeII lines with reliable atomic data. Oxygen abundances were inferred from a restricted non-LTE analysis of the 777nm OI triplet. We adopted the infrared flux method temperature scale and surface gravities based on Hipparcos trigonometric parallaxes. Description: We provide in Table 4 basic (HIP and HD numbers, V magnitude and parallax) and kinematic (radial velocities and heliocentric space velocity) data for our sample stars. The kinematic probabilities of being a thin-disk, thick-disk, and halo member are also given. Table 5 contains the line data used in our abundance computations as well as the equivalent widths of the lines measured in the solar spectrum. Stellar parameters and abundances are given in Table 6. Effective temperatures were derived using color calibrations based on the infrared flux method temperature scale while surface gravities were determined from the Hipparcos parallaxes and estimates of the stellar masses based on theoretical isochrones. We provide the mean abundance of iron determined from Fe I and Fe II lines separately and a mean [Fe/H] value obtained after applying our empirical re-scaling of the Fe I abundances. LTE and non-LTE oxygen abundances derived from the 777nm OI triplet are also given. The last three columns of Table 6, if available, provide our estimates of the stellar ages. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table4.dat 96 523 Basic and kinematic data table5.dat 41 135 Line data table6.dat 104 523 Fundamental parameters, abundances and ages
See also: I/239 : The Hipparcos and Tycho Catalogues (ESA 1997) Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 6 I6 --- HIP Hipparcos number (Cat. I/239) 8- 13 I6 --- HD ? HD number (Cat. III/135) if available 15- 19 F5.2 mag Vmag V magnitude 21- 25 F5.1 mas plx Parallax 27- 29 F3.1 mas e_plx Error in parallax 31- 36 F6.1 km/s HRV Heliocentric radial velocity 38- 42 F5.1 km/s e_HRV Error in HRV 44- 49 F6.1 km/s UVel Heliocentric space velocity component U 51- 55 F5.1 km/s e_UVel Error in UVel 57- 62 F6.1 km/s VVel Heliocentric space velocity component V 64- 68 F5.1 km/s e_VVel Error in VVel 70- 75 F6.1 km/s WVel Heliocentric space velocity component W 77- 81 F5.1 km/s e_WVel Error in WVel 83- 86 F4.2 --- P1 Kinematic probability of being thin-disk star 88- 91 F4.2 --- P2 Kinematic probability of being thick-disk star 93- 96 F4.2 --- P3 Kinematic probability of being halo star
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 7 F7.2 0.1nm Lambda Line wavelength 9- 12 A4 --- Ion Element and ionization stage 14- 17 F4.2 eV EP Excitation potential 19- 23 F5.2 [---] loggf Oscillator strength 25- 28 I4 2.8x10-17cm+2 sigma Van der Waals broadening cross section (1) 30- 34 F5.3 --- alpha Velocity parameter alpha (2) 36 A1 --- f_sigma [+] Unsold approximation for sigma (3) 38- 41 F4.1 0.1pm EWsun Equivalent width in the solar spectrum
Note (1): Van der Waals broadening cross section in atomic unit: 1 a.u. = 2.80*10-17cm2 Note (2): alpha is defined as σ(V)=σ(Vo)(V/Vo), where V is the velocity and sigma the cross-section. Note (3): the '+' indicates that sigma and alpha values correspond to the modified Unsold approximation (Unsold C6 multiplied by 2)
Byte-by-byte Description of file: table6.dat
Bytes Format Units Label Explanations
1- 6 I6 --- HIP Hipparcos number (Cat. I/239) 8- 13 I6 --- HD ? HD number (Cat. III/135) if available 15- 18 I4 K Teff Effective temperature 20- 23 F4.2 [cm/s2] logg Surface gravity 25- 28 F4.2 km/s vt Microturbulence velocity 30- 34 F5.2 [Sun] [Fe/H]1 Mean [Fe/H] from Fe I lines 36- 39 F4.2 [Sun] e_[Fe/H]1 Error in mean [Fe/H] from Fe I lines 41- 45 F5.2 [Sun] [Fe/H]2 Mean of [Fe/H] from Fe II lines 47- 50 F4.2 [Sun] e_[Fe/H]2 Error in mean [Fe/H] from Fe II lines 52- 56 F5.2 [Sun] [Fe/H] ? Adopted [Fe/H] 58- 61 F4.2 [Sun] e_[Fe/H] ? Error in adopted [Fe/H] 63- 67 F5.2 [Sun] [O/H]L LTE oxygen abundance 69- 72 F4.2 [Sun] e_[O/H]L Error in [O/H]L 74- 78 F5.2 [Sun] [O/H]N Non-LTE oxygen abundance 80- 83 F4.2 [Sun] e_[O/H]N Error in [O/H]N 85- 90 F6.3 [yr] logAge ? Stellar age 92- 97 F6.3 [yr] E_logAge ? Upper error bar in logAge 99-104 F6.3 [yr] e_logAge ? Lower error bar in logAge
Acknowledgements: Ivan Ramirez, ivan(at)astro.as.utexas.edu
(End) Patricia Vannier [CDS] 08-Jan-2007
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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