Fractionation of CO in the diffuse clouds toward Zeta Ophiuchi
1992; IOP Publishing; Volume: 397; Linguagem: Inglês
10.1086/171805
ISSN1538-4357
AutoresY. Sheffer, S. R. Federman, David L. Lambert, Jason A. Cardelli,
Tópico(s)Astro and Planetary Science
Resumoview Abstract Citations (64) References (50) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Fractionation of CO in the Diffuse Clouds toward zeta Ophiuchi Sheffer, Yaron ; Federman, S. R. ; Lambert, David L. ; Cardelli, Jason A. Abstract An analysis of CO A-X bands in diffuse clouds toward Zeta Ophiuchi is presented. The results provide isotopic ratios that constitute the strongest observational evidence for highly localized isotopic fractionation of CO in diffuse portions of an interstellar cloud. The value of the fractionation implies that selective photodissociation is the controlling influence of the fractionation. The molecule's excitation temperature is discussed and a lower limit to the O-16/O-18 ratio is provided. The absence of CO lines from the gas that provides broad CH+ and CH lines commonly attributed to warm gas behind a shock front is addressed. Publication: The Astrophysical Journal Pub Date: October 1992 DOI: 10.1086/171805 Bibcode: 1992ApJ...397..482S Keywords: Carbon Monoxide; Diffuse Radiation; Fractionation; Interstellar Gas; Molecular Clouds; Carbon Isotopes; Hubble Space Telescope; Interstellar Matter; Oxygen Isotopes; Spaceborne Astronomy; Ultraviolet Spectra; Astrophysics; ISM: ABUNDANCES; ISM: MOLECULES; STARS: INDIVIDUAL CONSTELLATION NAME: ZETA OPHIUCHI full text sources ADS | data products SIMBAD (2) MAST (1) ESA (1)
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