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Contamination of the 5394Å spectral region by telluric lines
- Source :
- New Astronomy. 15:669-677
- Publication Year :
- 2010
- Publisher :
- Elsevier BV, 2010.
-
Abstract
- The spectral region in the vicinity of 5394 A contains three prominent photospheric spectral lines, which can be used as a solar plasma diagnostic tool. The occurrence of telluric lines in this region is a potential source of systematic and random errors in these solar spectral lines. The goal of our investigation was to determine the telluric line contamination of this interesting spectral region. Several series of high-resolution solar spectra within an interval of about 4 A around the 5394 A wavelength were observed at different zenith distances of the Sun. Comparison of these spectra has permitted identification of telluric lines in this spectral interval. The observations were carried out with the horizontal solar spectrograph of the Heliophysical Observatory in Debrecen. Telluric feature blending was identified in the blue and red wings of the Fe I 5393.2 A line, and in the local continuum of the Mn I 5394.7 A line. The blue wing of the Fe I 5395.2 A line is contaminated by a weak telluric feature too. The red continuum of this line has a more prominent telluric contamination. A dozen of water vapor telluric lines that determined the observed telluric features were identified in this spectral interval. The profiles of three telluric lines that have a significant influence on both the profiles of solar spectral lines and the level of local continuum were derived, and the variation of their parameters (equivalent width and central depth) with air mass were analyzed.
- Subjects :
- Physics
Photosphere
Astrophysics::Instrumentation and Methods for Astrophysics
Telluric contamination
Astronomy and Astrophysics
Astrophysics
Spectral line
Fraunhofer lines
symbols.namesake
Wavelength
Space and Planetary Science
symbols
Astrophysics::Solar and Stellar Astrophysics
Astrophysics::Earth and Planetary Astrophysics
Instrumentation
Equivalent width
Spectrograph
Zenith
Remote sensing
Subjects
Details
- ISSN :
- 13841076
- Volume :
- 15
- Database :
- OpenAIRE
- Journal :
- New Astronomy
- Accession number :
- edsair.doi...........6f1294665833bb9931db6ce2ebc3967b