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J/PASJ/57/109     Late-G giants abundances             (Takeda+, 2005)

Stellar parameters and photospheric abundances of late-G giants: properties of the targets of the Okayama planet search program. Takeda Y., Sato B., Kambe E., Izumiura H., Masuda S., Ando H. <Publ. Astron. Soc. Jap., 57, 109-125 (2005)> =2005PASJ...57..109T
ADC_Keywords: Stars, late-type ; Stars, giant ; Abundances ; Equivalent widths Keywords: stars: abundances - stars: atmospheres - stars: fundamental parameters - stars: late-type Abstract: Towards clarifying the properties of late-G giants, for which we are currently conducting a planet-search project at Okayama Astrophysical Observatory, an extensive spectroscopic study has been performed for our first target sample of fifty-seven G6-G9 III stars, in order to establish the atmospheric parameters (Teff, logg, vt, and [Fe/H]), the stellar mass along with the evolutionary status, and the photospheric abundances of various elements. It was confirmed that the conventional spectroscopic method of parameter determination using Fe I / II lines with the assumption of LTE works successfully for these evolved stars. We determined the abundances (relative to the Sun) of 19 elements, and examined how their [X/Fe] ratios behave themselves with the run of [Fe/H]. Description: tablee1.dat contains input data of measured equivalent widths and the abundance results of the Fe I and Fe II lines corresponding to the finally converged solutions of the atmospheric parameters. tablee2.dat contains the measured equivalent widths and the results of the elemental abundances (for the elements other than Fe). In addition, the h104985.dat file show how the resulting abundances are affected by changes in the atmospheric parameters of Teff, logg, and vt, for the representative case of HD 104985. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 85 57 Basic data and the parameter solutions of the program stars table2.dat 127 57 Final results of the normalized abundances. tablee1a.dat 77 57 *Initial values of tablee1.dat calculations tablee1.dat 65 6814 EW data and the Fe abundances tablee2.dat 79 7247 Measured equivalent widths and elemental abundances average.dat 33 1271 Averaged abundances of tablee2.dat calculation h104985.dat 74 124 *HD 104985 second calculation h104985a.dat 52 22 Average values for h104985 second calculation
Note on tablee1a.dat: Information concerning the final parameter solutions derived by the TGVIT program. Note on h104985.dat: This file shows how the resulting abundances of HD 104985 are affected by applying small changes to Teff, log g, and vt in turn, as compared to the case of the standard parameter values (Teff=4877K, logg=2.85, caused by ambiguities in the choice of these parameters.
See also: J/PASJ/57/27 : Atmospheric parameters of nearby F-K stars (Takeda+, 2005) J/PASJ/57/45 : Lithium abundances of F-K stars (Takeda+, 2005) J/PASJ/57/65 : CNO abundances of solar-type stars (Takeda+, 2005) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 6 I6 --- HD HD number 8- 16 A9 --- SpType MK spectral type 19- 22 F4.2 mag Vmag ? V magnitude 24- 27 I4 K Teff Effective temperature 29- 32 F4.2 [cm/s2] logg log of surface gravity 34- 37 F4.2 km/s vt Microturbulent velocity 39- 43 F5.2 Sun [Fe/H] Metallicity 45- 48 F4.1 mas plx Trigonometric Hipparcos parallax 50- 53 F4.2 --- e_plx Relative error in parallax 55- 58 F4.2 mag AV Estimated interstellar extinction 60- 64 F5.2 mag VMAG Absolute V magnitude 66- 70 F5.2 mag BC Bolometric correction 72- 75 F4.2 [solLum] logL log of stellar luminosity 77- 80 F4.2 solMass Mass Stellar mass 82- 85 F4.2 [cm/s2] loggTLM log of surface gravity from Teff, logL and M
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 6 I6 --- HD HD number 8- 12 F5.2 --- [Fe/H] Metallicity 14- 18 F5.2 ---- [C/Fe] C abundance relative to Fe 20- 24 F5.2 ---- [O/Fe] ? O abundance relative to Fe 26- 30 F5.2 ---- [Na/Fe] ? Na abundance relative to Fe 32- 36 F5.2 ---- [Si/Fe] Si abundance relative to Fe 38- 42 F5.2 ---- [Ca/Fe] Ca abundance relative to Fe 44- 48 F5.2 ---- [Sc/Fe] Sc abundance relative to Fe 50- 54 F5.2 ---- [Ti/Fe] Ti abundance relative to Fe 56- 60 F5.2 ---- [V/Fe] V abundance relative to Fe 62- 66 F5.2 ---- [Cr/Fe] Cr abundance relative to Fe 68- 72 F5.2 ---- [Mn/Fe] ? Mn abundance relative to Fe 74- 78 F5.2 ---- [Co/Fe] Co abundance relative to Fe 80- 84 F5.2 ---- [Ni/Fe] Ni abundance relative to Fe 86- 90 F5.2 ---- [Cu/Fe] Cu abundance relative to Fe 92- 96 F5.2 ---- [Y/Fe] Y abundance relative to Fe 98-102 F5.2 ---- [Ce/Fe] Ce abundance relative to Fe 104-108 F5.2 ---- [Pr/Fe] Pr abundance relative to Fe 110-114 F5.2 ---- [Nd/Fe] Nd abundance relative to Fe 116-120 F5.2 ---- [Gd/Fe] ? Gd abundance relative to Fe 122-126 F5.2 ---- [Hf/Fe] ? Hf abundance relative to Fe
Byte-by-byte Description of file: tablee1a.dat
Bytes Format Units Label Explanations
1- 2 A2 --- --- [HD] 4- 9 I6 --- HD HD number (1) 11- 16 F6.3 --- xcur xcur parameter 18- 23 F6.1 K Teff(f) Effective temperature 25- 29 F5.3 [cm/s2] logg(f) log of surface gravity 31- 34 F4.2 km/s vt(f) Microturbulent velocity 36- 46 E11.6 --- func func parameter 48- 52 F5.3 --- A1 Initial abundance in Fe I 54- 58 F5.3 --- sig1 Standard deviation of Fe I abundances around A1 60- 64 F5.3 --- A2 Initial abundance in Fe II 66- 70 F5.3 --- sig2 Standard deviation of Fe II abundances around A2 72- 74 I3 --- n1 Number of used Fe I lines 76- 77 I2 --- n2 Number of used Fe II lines
Note (1): Initial values identical for all: met: xxx c1: 1.00000 c2: 1.00000 c3: 0.00000 ftot= E-04
Byte-by-byte Description of file: tablee1.dat
Bytes Format Units Label Explanations
1- 2 A2 --- --- [HD] 4- 9 I6 --- HD HD number 11- 14 I4 --- Line line number 15- 20 F6.2 --- Elem Species code (G1) 21- 29 F9.3 0.1nm lambda Wavelength 30- 36 F7.3 eV Chi lower excitation potential 37- 43 F7.3 --- loggf adopted log(gf) value 44- 49 F6.1 0.1pm EW equivalent width 50- 57 F8.3 --- abund1 Fe abundance (sign inversed for Fe II lines) [+A(FeI),-A(FeII)] 58- 65 F8.3 --- abund2 Fe abundance (sign inversed for Fe I lines) [-A(FeI),+A(FeII)]
Byte-by-byte Description of file: tablee2.dat
Bytes Format Units Label Explanations
1- 2 A2 --- --- [HD] 4- 9 I6 --- HD HD number 11- 15 F5.2 --- Elem Code for the species (G1) 17- 24 F8.3 0.1nm lambda Wavelength 26- 30 F5.3 eV chi Lower excitation potential 32- 37 F6.3 --- loggf log(gf) value 39- 43 F5.1 0.1pm EW(star) Equivalent width of the star 45- 48 F4.2 km/s vt(star) Adopted microturbulence of the star 50- 55 F6.3 --- A(star) Abundance of the star 57- 60 F4.1 0.1pm EW(Sun) Solar flux equivalent width 62- 65 F4.2 km/s vt(Sun) Adopted microturbulence of the Sun 67- 71 F5.3 --- A(Sun) Abundance of the Sun 73- 77 F5.2 --- delA Differential abundance (star-Sun) 79 A1 --- Note [x]
Byte-by-byte Description of file: average.dat
Bytes Format Units Label Explanations
1- 2 A2 --- --- [HD] 4- 9 I6 --- HD HD number 11- 12 I2 --- Nline Number of the lines for the species 14- 15 I2 --- Naver Number of the lines actually adopted for computing the averaged abundances after rejection of inadequate data (naturally, nline ≥ naver) 17- 21 F5.2 --- Elem Species code (G1) 23- 27 F5.2 Sun delA Averaged abundance value for the specie, <delA(star-Sun)> 30- 33 F4.2 Sun e_delA rms uncertainty on DelA
Byte-by-byte Description of file: h104985.dat
Bytes Format Units Label Explanations
1- 5 F5.2 --- Elem Code for species (ex. C I: 6.00 Ti II: 22.01) 7- 14 F8.3 0.1nm lambda Wavelength 16- 20 F5.3 eV chi Lower excitation potential 22- 27 F6.3 --- loggf log(gf) value 29- 33 F5.1 0.1pm EW Equivalent width 35- 40 F6.3 --- dA(dT=-150) Abundance change for delta(Teff)=-150K 42- 47 F6.3 --- dA(dT=+150) Abundance change for delta(Teff)=+150K 49- 54 F6.3 --- dA(dg=-0.2) Abundance change for delta(logg)=-0.2 56- 61 F6.3 --- dA(dg=+0.2) Abundance change for delta(logg)=+0.2 63- 67 F5.3 --- dA(dv=-0.3) Abundance change for delta(vt)=-0.3km/s 69- 74 F6.3 --- dA(dv=+0.3) Abundance change for delta(vt)=+0.3km/s
Byte-by-byte Description of file: h104985a.dat
Bytes Format Units Label Explanations
1- 2 I2 --- Nline Number of the lines for the species 4- 8 F5.2 --- Elem Code for species (G1) 10- 15 F6.3 --- dA(dT=-150) Average value over the line of abundance change for delta(Teff)=-150K 17- 22 F6.3 --- dA(dT=+150) Average value over the line of abundance change for delta(Teff)=+150K 25- 30 F6.3 --- dA(dg=-0.2) Average value over the line of abundance change for delta(logg)=-0.2 32- 37 F6.3 --- dA(dg=+0.2) Average value over the line of abundance change for delta(logg)=+0.2 41- 45 F5.3 --- dA(dv=-0.3) Average value over the line of abundance change for delta(vt)=-0.3km/s 47- 52 F6.3 --- dA(dv=+0.3) Average value over the line of abundance change for delta(vt)=+0.3km/s
Global notes: Note (G1): Species code used in the WIDTH9 program: Fe I: 26.00 Fe II: 26.01 O I: 8.00 Ba II: 56.01 C I: 6.00 Ti II: 22.01
History: From PASJ editor
(End) Patricia Vannier [CDS] 06-Apr-2005
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