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 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:
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FileName Lrecl Records Explanations
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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
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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.
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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
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Bytes Format Units Label Explanations
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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
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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- 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
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Byte-by-byte Description of file: tablee1a.dat
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Bytes Format Units Label Explanations
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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
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Note (1): Initial values identical for all:
met: xxx c1: 1.00000 c2: 1.00000 c3: 0.00000 ftot= E-04
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Byte-by-byte Description of file: tablee1.dat
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Bytes Format Units Label Explanations
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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)]
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Byte-by-byte Description of file: tablee2.dat
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Bytes Format Units Label Explanations
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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]
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Byte-by-byte Description of file: average.dat
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Bytes Format Units Label Explanations
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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
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Byte-by-byte Description of file: h104985.dat
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Bytes Format Units Label Explanations
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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
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Byte-by-byte Description of file: h104985a.dat
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Bytes Format Units Label Explanations
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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
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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
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History:
From PASJ editor
(End) Patricia Vannier [CDS] 06-Apr-2005