J/A+A/561/A63 The chemically peculiar binary HD 161701 (Gonzalez+, 2014)
HD 161701, a chemically peculiar binary with a HgMn primary and an Ap secondary.
Gonzalez J.F., Saffe C., Castelli F., Hubrig S., Ilyin I., Scholler M.,
Carroll T.A., Leone F., Giarrusso M.
<Astron. Astrophys. 561, A63 (2014)>
=2014A&A...561A..63G 2014A&A...561A..63G
ADC_Keywords: Binaries, spectroscopic ; Abundances, peculiar ; Magnetic fields
Keywords: binaries: spectroscopic - stars: chemically peculiar -
stars: atmospheres - stars: abundances - stars: magnetic field -
stars: individual: HD 161701
Abstract:
We perform a complete study of the HgMn binary HD 161701, including
the determination of physical parameters and photospheric chemical
abundances. We analyzed time series of high-resolution FEROS and HARPS
spectroscopic observations in addition to a near-IR spectrum obtained
with CRIRES. Radial velocity curves were combined with additional
spectroscopic information to estimate absolute stellar parameters. A
spectral separation technique was applied, which enabled us to conduct
a detailed spectral analysis of both components. The primary is a HgMn
star with overabundances of P, Mn, Ga, Y, Xe, and Hg. The secondary is
an Ap star showing strong (2-5dex) overabundances of Sr, Y, and
rare-earth elements.
We detected line profile variations in both stellar companions,
indicating a non uniform surface distribution of chemical composition.
The secondary presents a remarkable chemical pattern with Ti and
rare-earths pemanently facing the binary companion, and Fe
concentrated on the far side. The primary star shows weak profile
variations in Mn and Cr spectral lines. The coincidence of chemical
spots with the position of the binary companion suggests a possible
connection between the presence of the companion and the origin of
chemical anomalies.
Description:
Table 3 contain a list of IR lines identified in the CRIRES spectrum
(R∼95000) of HD 161701, including laboratory data of the spectral
lines. Tables 6 and 7 contain abundance measurements for individual
spectral lines of the two stellar components of HD 161701. Chemical
abundances has been calculated through spectral synthesis using the
HARPS separated spectra, with a resolving power of about 110000.
Objects:
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RA (2000) DE Designation(s)
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17 47 36.78 -14 43 33.0 HD 161701 = HR 6620
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 78 40 List of IR lines identified in the CRIRES spectrum
of HD 161701, for components A and B
table6.dat 51 299 Line by line abundances of HD 161701A
table7.dat 51 480 Line by line abundances of HD 161701B
lines_a.dat 26 1384 Spectral lines in HD161701A
plot_a.pdf 512 14274 Spectrum plot for HD161701A
lines_b.dat 21 2298 Spectral lines in HD161701B
plot_b.pdf 512 26559 Spectrum plot for HD161701B
feros_ab.dat 27 98668 Mean separated spectrum of stars HD161701A and
HD161701B calculated from 6 FEROS spectra
(R=48,000). The spectral coverage is 384-680nm
with a wavelength step of 0.003nm
harps_ab.dat 27 148001 Mean separated spectrum of stars HD161701A and
HD161701B calculated from 6 HARPS spectra
(R=110,000). The spectral coverage is 384-680nm
with a wavelength step of 0.002nm
synth_ab.dat 27 148001 Synthetic spectra of stars HD161701A and
HD161701B. The spectral coverage is 384-680nm
with a wavelength step of 0.002nm
refs.dat 156 50 log(gf) references
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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2- 9 F8.2 0.1nm lambda [10731.4/15844.1]? Observed wavelength
10 A1 --- u_lambda Uncertainty flag on lambda
12- 16 F5.3 --- Rc ? Relative flux at the line core
17 A1 --- u_Rc Uncertainty flag on Rc
19 A1 --- Comp [A/B] Star Companion (A or B)
22- 27 A6 --- Elem Element/Ion
31- 39 F9.3 0.1nm lam.lab ? Laboratory wavelength of the line
43- 48 F6.3 --- log(gf) ? Oscillator strength
51- 60 F10.3 cm-1 Xlow ? Lower Excitation potential
63- 72 F10.3 cm-1 Xup ? Upper Excitation potential
74- 78 A5 --- r_log(gf) Reference code for log(gf) value,
in refs.dat file
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Byte-by-byte Description of file: table6.dat table7.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Elem Element/Ion
10- 16 F7.2 0.1nm lambda [3840/6674] Wavelength
19- 24 F6.3 --- log(gf) log(gf) value
27- 31 A5 --- r_log(gf) Reference code for log(gf) value
in refs.dat file
35- 44 F10.3 cm-1 EP Excitation potential
47- 51 F5.2 [-] Abund Line abundance
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Byte-by-byte Description of file: lines_a.dat lines_b.dat
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Bytes Format Units Label Explanations
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1- 8 F8.3 0.1nm lambda [3800/6999] Wavelength
9 A1 --- --- [0]
11- 15 F5.2 --- Ion Atomic number-dot-ionization state
17- 21 F5.3 --- Int ? Flux at the line core relative to the
continuum in the synthetic spectrum
22- 26 A5 --- n_Int [blend] Blended line
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Byte-by-byte Description of file: feros_ab.dat harps_ab.dat synth_ab.dat
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Bytes Format Units Label Explanations
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1- 7 F7.2 0.1nm lambda [3840/6801] Wavelength
10- 17 F8.5 --- FluxA Normalized flux of star A
20- 27 F8.5 --- FluxB Normalized flux of star B
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- Ref Reference code for log(gf)
9- 27 A19 --- BibCode BibCode
29- 52 A24 --- Aut Author's name
54-156 A103 --- Com Comments
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Acknowledgements:
Jorge Federico Gonzalez, fgonzalez(at)icate-conicet.gob.ar
(End) Carlos Saffe [ICATE, Argentina], Patricia Vannier [CDS] 28-Oct-2013