The interstellar (C-12)N/(C-13)N ratio toward Zeta Persei

Details The interstellar (C-12)N/(C-13)N ratio toward Zeta Persei The interstellar (C-12)N/(C-13)N ratio toward Zeta Persei

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...379..267k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 379, Sept. 20, 1991, p. 267-270.

Astronomy and Astrophysics

Astrophysics

10

Abundance, Carbon 12, Carbon 13, Cyanogen, Eclipsing Binary Stars, Interstellar Matter, B Stars, High Resolution, Line Of Sight, Signal To Noise Ratios

Scientific paper

High-resolution, high signal-to-noise observations of interstellar CN toward Zeta Per are performed to determine the C-12/C-13 isotope ratio in this line of sight. Observations of (C-12)N/(C-13)N in several diffuse clouds are performed to assess whether CN suffers from isotope-selective effects. Values are obtained which are higher than the value toward Zeta Oph determined by Crane and Hegyi (1988) and lower than the results toward the more reddened stars HD 21483 obtained by Meyer et al. (1989) and Palazzi et al. (1990). Theory and observations indicate the existence of a spatial C-12/C-13 gradient which decreases toward the Galactic center at an approximate rate of 12 percent/kpc at the distance of the solar radius. It is argued that since a gradient of this character cannot explain the CN results, isotope-selective effects provide a more likely explanation for the large range in (C-12)N/(C-13)N ratios.

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