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Title:
Night-Sky High-Resolution Spectral Atlas of OH Emission Lines for Echelle Spectrograph Wavelength Calibration. II.
Authors:
Osterbrock, D. E.; Fulbright, J. P.; Bida, T. A.
Publication:
Publications of the Astronomical Society of the Pacific, v.109, p.614-623 (PASP Homepage)
Publication Date:
05/1997
Origin:
PASP
PASP/ApJ Keywords:
ATMOSPHERIC EFFECTS
DOI:
10.1086/133920
Bibliographic Code:
1997PASP..109..614O

Abstract

The potential of night-sky emission lines recorded on every long-exposure astronomical spectrum, for wavelength calibration, is reemphasized. The previously published high-resolution atlas, based on spectra obtained with the Keck 10-meter telescope on Mauna Kea and the HIRES high-resolution echelle spectrograph, is extended from 9000 \AA to 10600 \AA, the present effective long-wavelength limit for reasonable exposure times with current CCD's. The extension of the atlas shows many OH night-sky lines, and makes it possible to identify them easily on high-resolution spectra. Accurate wavelengths and references to their sources are given. Measured intensity ratios for the resolved, well measured lambda-type doublets are presented, and the probable errors in the listed wavelengths of the unresolved doublets, based on them, are discussed. Observations and identifications of a number of lines of weak satellite or intecombination bands of OH in the night-sky spectrum are discussed, and the "not proven" result of a search for OH lines in the (10 - 5) and (10 - 4) bands is mentione. (SECTION: Atmospheric Phenomena and Seeing)

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