Molecular Spectroscopy with the Biggest Night-Sky Spectrograph in the World

Details Molecular Spectroscopy with the Biggest Night-Sky Spectrograph in the World Molecular Spectroscopy with the Biggest Night-Sky Spectrograph in the World

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...191.4111o&link_type=abstract

American Astronomical Society, 191st AAS Meeting, #41.11; Bulletin of the American Astronomical Society, Vol. 29, p.1271

Astronomy and Astrophysics

Astronomy

Scientific paper

The emission lines of the night sky, recorded on every astronomical spectrogram, are in many ways a nuisance to observers, but they also provide a highly accurate standard wavelength reference system. There are OH Meinel main-band lines with wavelengths known to 0.00001 Angstroms in every echelle order from lambda5800 to lambda10600 . the present practical CCD limit. In addition, using coadded spectra from many observers taken with HIRES on the Keck I telescope, we have constructed a night-sky spectrum averaging 100 hours exposure from lambda5770 to lambda7075 , decreasing gradually to 30 hours at lambda8000 . On it and similar, earlier, shorter-exposure summed spectra many satellite lines of OH have been identified, also many isotopic main-band lines of (18) OH, and also four main-band lines from the previously unobserved (in the night sky) level v' = 10. Also, many previously unobserved O_2 atmospheric bands have been detected and identified, to higher vibrational energy levels than measured in the laboratory, and the complicated interplay of absorption and emission in the (16) O(16) O (with alternate rotational levels nonexistent), (16) O(17) O and (16) O(18) O bands have been studied.

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