J/PASJ/57/27 Atmospheric parameters of nearby F-K stars (Takeda+, 2005)
Spectroscopic study on the atmospheric parameters of nearby F-K dwarfs
and subgiants.
Takeda Y., Ohkubo M., Sato B., Kambe E., Sadakane K.
<Publ. Astron. Soc. Jap., 57, 27-43 (2005)>
=2005PASJ...57...27T 2005PASJ...57...27T
ADC_Keywords: Stars, nearby ; Stars, late-type ; Stars, atmospheres ;
Abundances ; Effective temperatures
Keywords: stars: abundances - stars: atmospheres - stars: late-type
Abstract:
Based on a collection of high-dispersion spectra obtained at Okayama
Astrophysical Observatory, the atmospheric parameters (Teff, logg, vt,
and [Fe/H]) of 160 mid-F through early-K stars were extensively
determined by the spectroscopic method using the equivalent widths of
Fe I and Fe II lines along with the numerical technique of Takeda et
al. (2002PASJ...54..451T 2002PASJ...54..451T). The results are comprehensively discussed
and compared with the parameter values derived by different approaches
(e.g., photometric colors, theoretical evolutionary tracks, Hipparcos
parallaxes, etc.) as well as with the published values found in
various literature. It has been confirmed that our purely
spectroscopic approach yields fairly reliable and consistent results.
Description:
tablee1.dat:
Based on the equivalent widths measured on the solar flux spectrum of
Kurucz et al. (1984, Solar FLux Atlas from 296 to 1300nm (Sunspot, New
Mexico: National Solar Observatory) for the Fe I and Fe II lines in
Meylan et al.'s (1993ApJS...85..163M 1993ApJS...85..163M) list (with additional two lines
Fe I 5855.091 and 6297.792 included by us), we derived the solar gf
values while using Kurucz's (1993, CD-ROM 13) ATLAS9 solar atmospheric
model (Teff=5777K, log g=4.437, [X]=0.0) with the assumption of
A(Fe)=7.50 and vt=1.0 km/s. Such established solar gf values are
presented with corresponding E.W. data. For comparison purposes, the
gf values of Kurucz and Bell (1995, CD-ROM 23) and those of Grevesse
and Sauval (1999, Cat. J/A+A/347/348) (if available) are also given.
If the solar gf value could not be determined because the line EW was
not measured, a dummy value of 99.999 is given with EW=0.0. Note that
the data in the first five columns (line, code, lambdaK, chi, and
loggfTGV) are the data actually used by the TGVIT program in the
present calculation.
tablee2.dat:
tablee2.dat contains the 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.
tablee2a.dat contains the header part of tablee2, which includes the
information concerning the final parameter solutions derived by the
TGVIT program.
The Fe abundances are repeatedly listed twice in columns 7 and 8
with different signs for neutral and ionized species, such as
[+A(FeI),-A(FeII)] in column 7 and [-A(FeI),+A(FeII)] in column 8,
in order for the convenience of plotting the FeI and FeII data
with different symbols.
tablee3.dat:
The convergence performance of the final solutions is represented by
dt, dg, and dv, which are the averaged absolute changes of Teff, logg,
and vt solutions (mostly oscillatory) over the last 4 iterations.
Regarding the final Fe abundances derived from Fe I and Fe II lines
(A1 and A2), A1=A2(=A)is practically accomplished in all cases, from
which [Fe/H] is derived as [Fe/H]=A-7.50. The statistical errors
involved with the finally adopted solutions in Teff, logg, vt, A1, and
A2 were estimated by the procedure described in subsection 5.2 and are
given here as errt, errg, errv, erra1, and erra2, respectively. Note,
however, that this procedure does not necessarily work well in all
cases. (Sometimes zero values are yielded, which does not mean that
the solution is error-free, of course.)
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 108 161 Basic data and the parameter solutions of the
program stars + the Sun (999999).
tablee1.dat 76 330 Solar gf values and EW of FeI/II lines
tablee2a.dat 77 161 Initial values of tablee2.dat calculations
tablee2.dat 65 27551 EW data and the Fe abundances for the
160 program stars + Sun (999999)
etab2/* . 161 Original files of tableE2
tablee3.dat 106 161 Parameter solutions, errors, convergence
performance
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See also:
J/PASJ/57/45 : Lithium abundances of F-K stars (Takeda+, 2005)
J/PASJ/57/65 : CNO abundances of solar-type stars (Takeda+, 2005)
J/PASJ/57/109 : Late-G giants abundances (Takeda+, 2005)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1 A1 --- n_HD [*] Individual note (1)
2- 7 I06 --- HD HD number
9- 21 A13 --- Name Name
23- 32 A10 --- SpType MK spectral type
34- 37 F4.2 mag Vmag ? V magnitude
39- 42 I4 K Teff Effective temperature
44- 47 F4.2 [cm/s2] logg log of surface gravity
49- 52 F4.2 km/s vt Microturbulent velocity
54- 58 F5.2 Sun [Fe/H] Metallicity
60- 64 F5.1 mas plx ? Trigonometric Hipparcos parallax
66- 69 F4.2 mag VMAG ? Absolute V magnitude
71- 75 F5.2 mag BC ? Bolometric correction
77- 81 F5.2 [solLum] logL ? log of stellar luminosity
83- 86 F4.2 solMass Mass ? Stellar mass
88- 91 F4.2 [cm/s2] loggTLM ? log of surface gravity from Teff, logL and M
93-106 A14 --- Rem Remarks (2)
--------------------------------------------------------------------------------
Note (1): *: Only the region R spectra were used for this star HD 99491
(i.e., unlike others,region G data were not used)
Note (2): T(29), g(0.05) and v(0.1) mean
<|δTeff|≥29K, <|δlogg|≥0.05 and <|δvt|≥0.1km/s
--------------------------------------------------------------------------------
Byte-by-byte Description of file: tablee1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 --- Line Line number used in the TGVIT program
6- 10 F5.2 --- Elem Species code (26.00: Fe I, 26.01: Fe II)
12- 19 F8.3 0.1nm lambdaK Adopted wavelength
[from Kurucz and Bell (1995)]
21- 25 F5.3 eV Chi lower excitation potential
(=chi_G, otherwise from Kurucz & Bell)
27- 32 F6.3 --- loggfTGV loggf value adopted in the TGVIT program
34 A1 --- n_loggfTGV [SG] source for loggf_TGV
(S-->loggfS, G-->loggfG)
36- 41 F6.3 --- loggfK log gf value from Kuruz and Bell (1995)
43- 47 F5.1 0.1pm EWS Equivalent width measured on the
solar flux atlas
49- 54 F6.3 --- loggfS ?=99.99 solar gf value determined by us
from EWS
56- 61 F6.3 --- loggfG ? log gf value from Grevesse and Sauval
(1999, Cat. J/A+A/347/348)
63- 70 F8.3 0.1nm lambdaG ? Wavelength from Grevesse and Sauval
(1999, Cat. J/A+A/347/348)
72- 76 F5.3 eV ChiG ? Lower excitation potential from
Grevesse and Sauval (1999,
Cat. J/A+A/347/348)
--------------------------------------------------------------------------------
Byte-by-byte Description of file: tablee2a.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 A2 --- --- [HD]
4- 9 I06 --- HD HD number (G1) (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 ftol= E-04
--------------------------------------------------------------------------------
Byte-by-byte Description of file: tablee2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 A2 --- --- [HD]
4- 9 I06 --- HD HD number (G1)
11- 14 I4 --- Line line number
15- 20 F6.2 --- Elem FeI: 26.00 FeII: 26.01
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: tablee3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 I06 --- HD HD number of the object (G1)
8- 11 F4.1 K DTeff Effective temperature variation (abs. value)
averaged over last 4 iterations
13- 17 F5.3 cm/s2 Dlogg Surface gravity variation(abs. value) averaged
over last 4 iterations
19- 22 F4.2 km/s Dvt Microturbulent velocity variation (abs. value)
averaged over last 4 iterations
24- 29 F6.1 K Teff finally converged (adopted) solution of
effective temperature
31- 35 F5.3 cm/s logg finally converged (adopted) solution of
surface gravity
37- 40 F4.2 km/s vt finally converged (adopted) solution of
microturbulent velocity
42- 47 F6.3 --- [Fe/H] finally converged (adopted) solution of [Fe/H]
(=A-7.50)
49- 51 I3 --- n1 Number of used Fe I lines
53- 57 F5.3 --- A1 Averaged Fe abundance derived from Fe I lines
59- 63 F5.3 --- sig1 Standard deviation of Fe I abundances
around A1
65- 66 I2 --- n2 Number of used Fe II lines
68- 72 F5.3 --- A2 Averaged Fe abundance derived from Fe II lines
74- 78 F5.3 --- sig2 Standard deviation of Fe II abundances
around A2
80- 83 F4.1 K e_Teff Estimated error in Teff
85- 89 F5.3 cm/s e_logg Estimated error in logg
91- 94 F4.2 km/s e_vt Estimated error in vt
96-100 F5.3 --- e_A1 Estimated error in A1
102-106 F5.3 --- e_A2 Estimated error in A2
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Global notes:
Note (G1): 999999 is the Sun(moon)
History:
From PASJ editor, Maho Kuroiwa, maho(at)pasj.asj.or.jp
* 27-May-2005: HD number corrected from 733640 into 133640
in tables E2 and E3.
(End) Patricia Vannier [CDS] 06-Apr-2005