Interstellar carbon monoxide toward ζ ophiuchi

David L. Lambert; Yaron Sheffer; Ronald L. Gilliland; S. R. Federman

doi:10.1086/173600

Interstellar carbon monoxide toward ζ ophiuchi

David L. Lambert, Yaron Sheffer, Ronald L. Gilliland, S. R. Federman

Astronomy & Astrophysics

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Abstract

Interstellar CO A-X bands in the spectrum of ζ Oph were recorded at high S/N with grating G160M of the Goddard High Resolution Spectrograph on the Hubble Space Telescope. Isotopic fractionation of CO is severe: ¹²CO/¹³CO = 167, C¹⁶O/C¹⁸O ≃ 1550 and C¹⁶O/C¹⁷O > 5900 are found where ¹²C/¹³C = 70, ¹⁶O/ ¹⁸O = 500, and ¹⁶O/¹⁷O = 2600 are observed or expected. Standard models of the æ Oph cloud predict ¹²CO/¹³CO ≲ 70. The higher observed ratio suggests that photodissociation of CO, not the isotopic charge exchange reaction (¹³C⁺ + CO ↔ ¹²C⁺ + ¹³CO), is the dominant influence on the ¹²CO/¹³CO ratio.

Original language	English (US)
Pages (from-to)	756-771
Number of pages	16
Journal	Astrophysical Journal
Volume	420
Issue number	2
DOIs	https://doi.org/10.1086/173600
State	Published - Jan 10 1994

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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title = "Interstellar carbon monoxide toward ζ ophiuchi",

abstract = "Interstellar CO A-X bands in the spectrum of ζ Oph were recorded at high S/N with grating G160M of the Goddard High Resolution Spectrograph on the Hubble Space Telescope. Isotopic fractionation of CO is severe: 12CO/13CO = 167, C16O/C18O ≃ 1550 and C16O/C17O > 5900 are found where 12C/13C = 70, 16O/ 18O = 500, and 16O/17O = 2600 are observed or expected. Standard models of the {\ae} Oph cloud predict 12CO/13CO ≲ 70. The higher observed ratio suggests that photodissociation of CO, not the isotopic charge exchange reaction (13C+ + CO ↔ 12C+ + 13CO), is the dominant influence on the 12CO/13CO ratio.",

author = "Lambert, {David L.} and Yaron Sheffer and Gilliland, {Ronald L.} and Federman, {S. R.}",

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T1 - Interstellar carbon monoxide toward ζ ophiuchi

AU - Lambert, David L.

AU - Sheffer, Yaron

AU - Gilliland, Ronald L.

AU - Federman, S. R.

PY - 1994/1/10

Y1 - 1994/1/10

N2 - Interstellar CO A-X bands in the spectrum of ζ Oph were recorded at high S/N with grating G160M of the Goddard High Resolution Spectrograph on the Hubble Space Telescope. Isotopic fractionation of CO is severe: 12CO/13CO = 167, C16O/C18O ≃ 1550 and C16O/C17O > 5900 are found where 12C/13C = 70, 16O/ 18O = 500, and 16O/17O = 2600 are observed or expected. Standard models of the æ Oph cloud predict 12CO/13CO ≲ 70. The higher observed ratio suggests that photodissociation of CO, not the isotopic charge exchange reaction (13C+ + CO ↔ 12C+ + 13CO), is the dominant influence on the 12CO/13CO ratio.

AB - Interstellar CO A-X bands in the spectrum of ζ Oph were recorded at high S/N with grating G160M of the Goddard High Resolution Spectrograph on the Hubble Space Telescope. Isotopic fractionation of CO is severe: 12CO/13CO = 167, C16O/C18O ≃ 1550 and C16O/C17O > 5900 are found where 12C/13C = 70, 16O/ 18O = 500, and 16O/17O = 2600 are observed or expected. Standard models of the æ Oph cloud predict 12CO/13CO ≲ 70. The higher observed ratio suggests that photodissociation of CO, not the isotopic charge exchange reaction (13C+ + CO ↔ 12C+ + 13CO), is the dominant influence on the 12CO/13CO ratio.

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Interstellar carbon monoxide toward ζ ophiuchi

Abstract

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