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High-resolution oscillator strength measurements of the v' = 0,1 bands of the B −X, C −X, and E −X systems in five isotopologues of carbon monoxide

Published online by Cambridge University Press:  18 July 2017

Glenn Stark
Affiliation:
Department of Physics, Wellesley College, Wellesley, MA, USA email: gstark@wellesley.edu
A. N. Heays
Affiliation:
Leiden Observatory, Leiden University, The Netherlands
J. R. Lyons
Affiliation:
School of Earth and Space Exploration, Arizona State University, Tempe, AZ, USA
M. Eidelsberg
Affiliation:
Observatoire de Paris, 5 place Jules Janssen, 92195 Meudon, France
S. R. Federman
Affiliation:
Department of Physics and Astronomy, University of Toledo, Toledo, OH, USA
J. L. Lemaire
Affiliation:
Observatoire de Paris, 5 place Jules Janssen, 92195 Meudon, France
N. de Oliveira
Affiliation:
Synchrotron SOLEIL, St. Aubin, France
L. Nahon
Affiliation:
Synchrotron SOLEIL, St. Aubin, France
Corresponding
E-mail address:
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Extract

The photochemistry of CO and its isotoplogues affects the structure and evolution of many astronomical environments, including interstellar clouds, circumstellar disks around newly formed stars, and the envelopes surrounding highly evolved stars. When in the presence of a strong ultraviolet field, the primary destruction mechanism for interstellar and circumstellar CO is photodissociation, which is entirely governed by discrete line absorption into predissociating levels in the wavelength range 91.2 to 111.8 nm. Because the CO spectrum consists primarily of resolved line features, self-shielding effects in high-column density environments can lead to strong isotopic fractionation signatures in both CO and elemental oxygen and carbon; for example, CO self-shielding in the solar nebula has been invoked to explain the unusual oxygen isotope ratios observed in the earliest solar system condensates, viz. calcium-aluminum inclusions (CAIs) in primitive meteorites.

Type
Addendum
Copyright
Copyright © International Astronomical Union 2017 
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High-resolution oscillator strength measurements of the v' = 0,1 bands of the B −X, C −X, and E −X systems in five isotopologues of carbon monoxide
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High-resolution oscillator strength measurements of the v' = 0,1 bands of the B −X, C −X, and E −X systems in five isotopologues of carbon monoxide
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High-resolution oscillator strength measurements of the v' = 0,1 bands of the B −X, C −X, and E −X systems in five isotopologues of carbon monoxide
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