J/A+A/587/A65 Visible and near-infrared solar spectra (Reiners+, 2016)
The IAG solar flux atlas: Accurate wavelengths and absolute convective blueshift
in standard solar spectra.
Reiners A., Mrotzek N., Lemke U., Hinrichs J., Reinsch K.
<Astron. Astrophys. 587, A65 (2016)>
=2016A&A...587A..65R 2016A&A...587A..65R (SIMBAD/NED BibCode)
ADC_Keywords: Sun ; Spectra, infrared ; Spectroscopy
Keywords: atlases - line: identification - methods: observational - standards -
Sun: fundamental parameters
Abstract:
We present a new solar flux atlas with the aim of understanding
wavelength precision and accuracy in solar benchmark data. The atlas
covers the wavelength range 405-2300nm and was observed at the
Institut fur Astrophysik, Gottingen (IAG), with a Fourier transform
spectrograph (FTS). In contrast to other FTS atlases, the entire
visible wavelength range was observed simultaneously using only one
spectrograph setting. We compare the wavelength solution of the new
atlas to the Kitt Peak solar flux atlases and to the HARPS
frequency-comb calibrated solar atlas. Comparison reveals systematics
in the two Kitt Peak FTS atlases resulting from their wavelength scale
construction, and shows consistency between the IAG and the HARPS
atlas. We conclude that the IAG atlas is precise and accurate on the
order of ±10m/s in the wavelength range 405-1065nm, while the Kitt
Peak atlases show deviations as large as several ten to 100m/s. We
determine absolute convective blueshift across the spectrum from the
IAG atlas and report slight differences relative to results from the
Kitt Peak atlas that we attribute to the differences between
wavelength scales. We conclude that benchmark solar data with accurate
wavelength solution are crucial to better understand the effect of
convection on stellar radial velocity measurements, which is one of
the main limitations of Doppler spectroscopy at m/s precision.
Description:
We obtained spectra with two different settings, one visual (VIS) and
one near-infrared (NIR). Observations were carried out between March
and July 2014.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 32 1251 Absolute convective blueshift of FeI lines
measured from the IAG atlas
spnir.dat 46 3001260 NIR atlas 1000-2300nm
spvis.dat 46 4057462 VIS atlas 405-1065nm
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See also:
J/A+A/274/555 : Asymmetry of FeI lines in solar spectrum (Stathopoulou+ 1993)
J/ApJS/91/461 : EUV spectrum of solar active region (Thomas+, 1994)
J/A+AS/103/57 : Ion-atom collisions in Sun atmosphere (Mihajlov+ 1994)
J/A+AS/113/71 : Lines in the infrared solar spectrum (Ramsauer+, 1995)
J/A+AS/126/281 : Solar disk spectrum (660-1175A) (Curdt+ 1997)
J/A+A/370/1071 : Fe XII UV line intensity ratios (Binello+, 2001)
J/A+A/375/591 : SUMER Spectral Atlas of Solar Disk Features (Curdt+, 2001)
J/A+A/432/1063 : Analysis of inner solar corona in Extreme-UV (Lanzafame+ 2005)
J/A+A/507/417 : Oxygen lines in solar granulation. I. (Pereira+, 2009)
J/ApJS/181/351 : Solar flux model in 30-1300nm wavelength range (Killen+, 2009)
J/A+A/544/A125 : Solar lines from Ceres spectra (Molaro+, 2012)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 8 F8.4 nm lambda Central wavelengths at rest
(Nave et al., 1994, Cat. J/ApJS/94/221)
12- 15 I4 0.1pm EW ?=- Equivalent widths (disc centre)
(Allende Prieto+ 1998, Car. J/A+AS/129/41)
19- 22 F4.2 --- relDepth Depth flux at line center relative to unity
26- 32 F7.1 m/s ConvBS ?=- Convective blueshift
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Byte-by-byte Description of file: spnir.dat spvis.dat
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Bytes Format Units Label Explanations
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1- 14 F14.8 cm-1 Wave Wavenumber
17- 33 F17.15 --- nFlux Normalized flux
35- 46 F12.10 --- rFlux Raw (unnormalized) flux
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Acknowledgements:
Ansgar Reiners, Ansgar.Reiners(at)phys.uni-goettingen.de
History:
* 17-Feb-2016: First on-line data
* 23-Jun-2017: tablea1 added (from author)
(End) Patricia Vannier [CDS] 18-Dec-2015