Determination of (C-12)/(C-13) in the interstellar medium toward Zeta Ophiuchi and XI Persei

Details Determination of (C-12)/(C-13) in the interstellar medium toward Zeta Ophiuchi and XI Persei Determination of (C-12)/(C-13) in the interstellar medium toward Zeta Ophiuchi and XI Persei

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...407..185h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 407, no. 1, p. 185-197.

Astronomy and Astrophysics

Astrophysics

29

Carbon Isotopes, Interstellar Chemistry, Interstellar Matter, Ophiuchi Clouds, Astronomical Spectroscopy, Charge Coupled Devices, Molecular Spectra

Scientific paper

The Lick Observatory Reticon (LOR) data presented in Hawkins et al. (1985) are reanalyzed in order to determine the cause of the significant discrepancy in (C-12)/(C-13) isotope ratios determined on the basis of observations of this isotope in the interstellar medium toward Zeta Ophiuchi and Xi Persei. A new set of Lick Observatory observations toward Zeta Oph are obtained using a CCD detector. The KPNO coude feed echelle spectrograph and a CCD detector are used to carry out high-resolution, high SNR ratio observations toward Zeta Oph and Xi Per. The LOR results for Zeta Oph are uncertain, ranging to 40 to 60, owing to the error in continuum placement. The KPNO results toward Zeta Oph are (C-12)H/(C-13)H(+)(0, 0) = 63 +/- 8, (C-12)H(+)/(C-13)H(+)(1, 0) = 67 +/- 19, and (C-12)N/(C-13)N = 100 + 88/- 33. Toward Xi Per, the KPNO measurements yield (C-12)H(+)/(C-13)H(+) = 49 +/- 15 from the 4232-A band, and a lower limit of 45 from the 3957-A observations.

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