Journal ArticleDOI
The12C/13C isotope ratio in comets, stars and interstellar matter
Vladimír Vanýsek,J. Rahe +1 more
- Vol. 18, Iss: 4, pp 441-446
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TLDR
The 12C/13C isotope ratio in the interstellar medium and in stellar atmospheres is discussed and compared to the value found in the solar system and especially in comets.Abstract:
The12C/13C isotope ratio in the interstellar medium and in stellar atmospheres is discussed and compared to the value found in the solar system and especially in comets. The cometary value (≥100) tends to be slightly above the terrestrial value and is definitively higher than that for interstellar molecular clouds (about 30 to 50).read more
Citations
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Carbon monoxide in the Venus atmosphere
TL;DR: Carbon monoxide in the Venus atmosphere was observed from high-resolution line spectra interferometric analysis as discussed by the authors, where the authors used a high resolution line spectrometer to measure the atmospheric carbon dioxide.
Journal ArticleDOI
On the origin of cometary nuclei in the presolar nebula
L. Biermann,K. W. Michel +1 more
TL;DR: In this paper, a simple relation is derived between the presolar nebula's temperature and the upper limit to the mass of the planetesimals, based on available observational evidence on the solid particles in interplanetary and interstellar space and of theoretical considerations on the relationship between them and on the sedimentation process.
Book ChapterDOI
The Accumulation and Structure of Comets
TL;DR: The evidence for the accumulation of the terrestrial planets and comets from solid grains is reviewed briefly in this article, where various proposals for formation of cometary nuclei are described and commented upon.
Nature and origin of comets
Julio A. Fernandez,Klaus Jockers +1 more
TL;DR: In this article, the authors consider cometary motion, the physical properties of the neutral gaseous matter, the nucleus, dust particles, cometary ion origin and interactions with the solar wind.
Book ChapterDOI
Composition in Halley's Comet: Clues to Origin and History of Cometary Matter.
TL;DR: In this paper, the gas and dust composition in the coma of Halley's comet has been studied and it has been shown that highly volatile material is very abundant, consistent with condensation and accretion at very low temperature.
References
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Journal ArticleDOI
The isotopic composition of hydrogen and carbon in the carbonaceous chondrites
TL;DR: In this paper, a number of carbonaceous chondrites have been analyzed for hydrogen and carbon content and for the isotopic composition of these elements, and the results are discussed in the light of present theories on the formation of the planetary system and on the origin of meteorites.
Journal ArticleDOI
Carbon monoxide in the Venus atmosphere.
TL;DR: Carbon monoxide in the Venus atmosphere was observed from high-resolution line spectra interferometric analysis as mentioned in this paper, where the authors used a high resolution line spectrometer to measure the atmospheric carbon dioxide.
Carbon monoxide in the Venus atmosphere
TL;DR: Carbon monoxide in the Venus atmosphere was observed from high-resolution line spectra interferometric analysis as discussed by the authors, where the authors used a high resolution line spectrometer to measure the atmospheric carbon dioxide.
Journal ArticleDOI
Isotopic abundance variations in interstellar HCN
TL;DR: In this paper, a study of the relative abundances of the rare isotopic species H/sup 12/C/sup 15/N and HCN has been made in six dense molecule clouds through observations of the 3.5 mm wavelength rotational transitions.
Journal ArticleDOI
/sup 12/C//sup 13/C ratios in stars ascending the giant branch the first time
TL;DR: In this article, the authors used the mass loss mechanism and the hydrogen shell instability to obtain a ratio of /sup 12/C/sup 13/C in red supergiants.