J/PASJ/58/389 O/Fe abundances of 15 RR Lyrae (Takeda+, 2006)
On the spectroscopic determination of atmospheric parameters and O/Fe
abundances of RR Lyrae stars.
Takeda Y., Honda S., Aoki W., Takada-hidai M., Zhao G., Chen Y.-Q.,
Shi J.-R.
<Publ. Astron. Soc. Jap., 58, 389-406 (2006)>
=2006PASJ...58..389T 2006PASJ...58..389T
ADC_Keywords: Stars, variable ; Abundances, peculiar ; Stars, atmospheres
Keywords: stars: abundances - stars: atmospheres -
stars: fundamental parameters -
stars: individual (RR Lyr, DX Del, DH Peg, VY Ser) -
stars: variables: other
Abstract:
In order to study how the conventional spectroscopic method based on
the equivalent widths of the Fe I and Fe II lines effectively applies
to determining the atmospheric parameters (Teff, logg, vt, [Fe/H])
of RR Lyrae variables and how accurately the abundances can be
established from such constructed model atmospheres, we analyzed 15
high-dispersion spectrograms of RR Lyr, DX Del, DH Peg, and VY Ser
taken at several different phases by using the HDS spectrograph of the
Subaru Telescope, and examined the consistency of the resulting
phase-to-phase abundances.
Description:
The file, ewidlist.dat, in which the equivalent widths data of the Fe
I and Fe II lines measured from each of the 15 spectra for four stars
(RR Lyr, DX Del, DH Peg, and VY Ser) are presented. Here, all measured
data are given irrespective of whether or not they were actually used
for the parameter determination. (Regarding the finally adopted lines
for parameter determinations which remained after the rejection
process of some inappropriate lines, see other tables.)
Other files, each corresponding to each of the 15 spectra for four
stars (RR Lyr, DX Del, DH Peg, and VY Ser), contain the adopted data
of equivalent widths and the abundance results of the Fe I and Fe II
lines corresponding to the finally converged solutions of the
atmospheric parameters.
Objects:
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RA (2000) DE Designation(s)
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19 25 27.9 +42 47 04 RR Lyr = HD 182989
20 47 28.4 +12 27 51 DX Del = BD+11 4381
22 15 25.6 +06 49 21 DH Peg = BD+06 4990
15 31 01.9 +01 41 02 VY Ser = HD 138279
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
ewidlist.dat 139 220 Fe line data and the measured equivalent widths
tabe2/* . 16 EW data for TT Lyr, DX Del, DH Peg, VY Ser and Sun
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Description of file: ewidlist.dat
The data contained in this file are divided into two parts: atomic
data of 220 Fe I/II lines and their equivalent widths measured on each
of the 15 spectra of RR Lyr, DX Del, DH Peg, and VY Ser. All the
atomic data were taken from the compilation of Kurucz and Bell (1995,
Kurucz CD-ROM, No. 23 ). The meanings of these line data are mostly
self-explanatory. Regarding the definition of the damping parameters
(gammar, gammas, gammas) adopted here, see, for example, the caption
in table 1 of Takeda (2003, Cat. J/A+A/402/343). When the equivalent
widths were not (could not be) measured, zero values are assigned.
Description of files: tabe2/*:
The 7 characters "???????" of the file name indicates the spectrum
label. The first four lines are the header part which includes the
information concerning the final parameter solutions.
!!!!!!!
Remark: The quantity "xcur" in the first line is the differential
metallicity (relative to the Sun) formally evaluated as A(Fe)-7.50.
However, since we adopted A(Fe:Sun) = 7.60 as the standard solar
abundance (cf. subsection 3.1), our final [Fe/H] is eventually related
to this xcur as [Fe/H] = xcur - 0.1.
!!!!!!!
From the 5th line begins the actual data for each of the used Fe
lines: line number, species code, wavelength, lower excitation
potential, gf value, measured equivalent width, and the resulting Fe
abundance corresponding to the final solution of Teff, log g, and vt.
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.
See also:
J/A+A/308/481 : Metallic line doubling phenomenon in RR Lyrae (Chadid+, 1996)
Byte-by-byte Description of file: ewidlist.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Line Line number (7000- for Fe I 8000- for Fe II)
5- 10 F6.2 --- Code Species code (26.00: Fe I, 26.01: Fe II)
11- 19 F9.3 0.1nm Lambda Wavelength
20- 25 F6.2 eV Ep Lower excitation potential
26- 31 F6.2 --- loggf log gf value
32- 37 F6.2 --- Gammar Radiation damping parameter
38- 43 F6.2 --- Gammas Quadratic Stark effect damping parameter
44- 49 F6.2 --- Gammaw van der Waals effect damping parameter
50- 55 F6.1 0.1pm EW(rrlyr1) ?=0.0 Equivalent width for spectrum rrlyr-1
56- 61 F6.1 0.1pm EW(rrlyr2) ?=0.0 Equivalent width for spectrum rrlyr-2
62- 67 F6.1 0.1pm EW(rrlyr3) ?=0.0 Equivalent width for spectrum rrlyr-3
68- 73 F6.1 0.1pm EW(rrlyr4) ?=0.0 Equivalent width for spectrum rrlyr-4
74- 79 F6.1 0.1pm EW(rrlyr5) ?=0.0 Equivalent width for spectrum rrlyr-5
80- 85 F6.1 0.1pm EW(dxdel1) ?=0.0 Equivalent width for spectrum dxdel-1
86- 91 F6.1 0.1pm EW(dxdel2) ?=0.0 Equivalent width for spectrum dxdel-2
92- 97 F6.1 0.1pm EW(dxdel3) ?=0.0 Equivalent width for spectrum dxdel-3
98-103 F6.1 0.1pm EW(dhpeg1) ?=0.0 Equivalent width for spectrum dhpeg-1
104-109 F6.1 0.1pm EW(dhpeg2) ?=0.0 Equivalent width for spectrum dhpeg-2
110-115 F6.1 0.1pm EW(dhpeg3) ?=0.0 Equivalent width for spectrum dhpeg-3
116-121 F6.1 0.1pm EW(vyser1) ?=0.0 Equivalent width for spectrum vyser-1
122-127 F6.1 0.1pm EW(vyser2) ?=0.0 Equivalent width for spectrum vyser-2
128-133 F6.1 0.1pm EW(vyser3) ?=0.0 Equivalent width for spectrum vyser-3
134-139 F6.1 0.1pm EW(vyser4) ?=0.0 Equivalent width for spectrum vyser-4
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Byte-by-byte Description of file (#): tabe2/*
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Bytes Format Units Label Explanations
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1- 4 I4 --- Line Line number
5- 10 F6.2 --- Code FeI: 26.00 FeII: 26.01
11- 19 F9.3 0.1nm Lambda Wavelength
20- 26 F7.3 eV Ep Lower excitation potential (chi)
27- 33 F7.3 --- loggf Adopted log(gf) value
34- 39 F6.1 0.1pm EW Equivalent width
40- 47 F8.3 --- Abund1 Fe abundance (sign inversed for Fe II lines)
48- 55 F8.3 --- Abund2 Fe abundance (sign inversed for Fe I lines)
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Acknowledgements:
Maho Kuroiwa, maho(at)pasj.asj.or.jp
(End) Patricia Vannier [CDS] 16-May-2006