Carbon-isotope ratio in PUMA 1 spectra of P/Halley dust

Details Carbon-isotope ratio in PUMA 1 spectra of P/Halley dust Carbon-isotope ratio in PUMA 1 spectra of P/Halley dust

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...187..385s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 187, no. 1-2, Nov. 1987, p. 385-387.

Astronomy and Astrophysics

Astrophysics

11

Carbon 12, Carbon 13, Cosmic Dust, Halley'S Comet, Mass Spectrometers, Ratios, Abundance, Astronomical Spectroscopy, Refractory Materials, Solar System, Volatility

Scientific paper

Carbon isotopes 12C and 13C have yet been identified both in cometary gas and dust. Although the determination from optical C2 and CN emissions from ground-based observations is not precise, the ratio 12C/13C is roughly the same as the mean ratio derived from PUMA 1 mass spectra of cometary grains. This value both in volatile and refractory material does not differ much from the nominal solar system value 90. However, the collection of 38 PUMA 1 mode 0 spectra shows surprisingly variable 12/13 amu lines ratio within 3 decades, increasing with carbon abundance in the grains. Possible instrumental effects are discussed.

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