The Identification of ^{13}C^{16}O in the Infrared Sunspot Spectrum and the Determination of the Solar ^{12}C/^{13}C Abundance Ratio

1972 ◽  
Vol 171 ◽  
pp. 615 ◽  
Author(s):  
Donald N. B. Hall ◽  
Robert W. Noyes ◽  
Thomas R. Ayres
Keyword(s):  
Abundance Ratio ◽  
Sunspot Spectrum

A New Determination of the C^{12}/C^{13} Isotopic Abundance Ratio in the Solar Photosphere

1967 ◽  
Vol 147 ◽  
pp. 697 ◽  
Author(s):  
Luise Herzberg ◽  
L. Delbouille ◽  
G. Roland
Keyword(s):  
Abundance Ratio ◽  
Solar Photosphere ◽  
Isotopic Abundance

Determination of the 36 Ar/ 38 Ar isotopic abundance ratio of the solar wind using SOHO/CELIAS/MTOF

2001 ◽  
Vol 65 (24) ◽  
pp. 4589-4596 ◽  
Author(s):  
James M. Weygand ◽  
Fred M. Ipavich ◽  
Peter Wurz ◽  
John A. Paquette ◽  
Peter Bochsler
Keyword(s):  
Solar Wind ◽  
Abundance Ratio ◽  
Isotopic Abundance

scholarly journals Abundances of C, N and O in Planetary Nebulae

1989 ◽  
Vol 131 ◽  
pp. 218-218 ◽  
Author(s):  
A. A. Nikitin ◽  
A. F. Kholtygin ◽  
A. A. Sapar ◽  
T. H. Feklistova
Keyword(s):  
Planetary Nebulae ◽  
Abundance Ratio ◽  
Evolutionary Status ◽  
Spectral Features ◽  
Giant Stars ◽  
Red Giant Stars ◽  
Red Giant ◽  
Abundance Determination

The abundances of C, N and O in planetary nebulae must correspond to the evolutionary status of their progenitor red giant stars. The best spectral features for abundance determination of these elements are the recombination lines, which depend weakly on the variations of Te and ne. The abundance ratio of the ions A+ and H+ can be given by [1–3].

scholarly journals The extraordinary composition of the blue comet C/2016 R2 (PanSTARRS)

2018 ◽  
Vol 619 ◽  
pp. A127 ◽  
Author(s):  
N. Biver ◽  
D. Bockelée-Morvan ◽  
G. Paubert ◽  
R. Moreno ◽  
J. Crovisier ◽  
...  
Keyword(s):  
Radio Telescope ◽  
Heliocentric Distance ◽  
Abundance Ratio ◽  
Visible Spectroscopy ◽  
Production Rates ◽  
Sulfur Species ◽  
Upper Limits ◽  
Multi Wavelength ◽  
Rare Group

We present a multi-wavelength study of comet C/2016 R2 (PanSTARRS). This comet was observed on 23 and 24 January 2018 with the IRAM 30 m telescope, and in January to March 2018 with the Nançay radio telescope. Visible spectroscopy was performed in December 2017 and February 2018 with small amateur telescopes. We report on measurements of CO, CH3OH, H2CO and HCN production rates, and on the determination of the N2/CO abundance ratio. Several other species, especially OH, were searched for but not detected. The inferred relative abundances, including upper limits for sulfur species, are compared to those measured in other comets at about the same heliocentric distance of ~2.8 AU. The coma composition of comet C/2016 R2 is very different from all other comets observed so far, being rich in N2 and CO and dust poor. This suggests that this comet might belong to a very rare group of comets formed beyond the N2 ice line. Alternatively, comet C/2016 R2 (PanSTARRS) could be the fragment of a large and differentiated transneptunian object, with properties characteristic of volatile-enriched layers.

scholarly journals Determination of the abundance ratio of copper isotopes by a surface ionization method

1967 ◽  
Vol 16 (1) ◽  
pp. 7-15 ◽  
Author(s):  
Tadao KANZAKI ◽  
Seiichiro YOKOZUKA ◽  
Hidetake KAKIHANA
Keyword(s):  
Abundance Ratio ◽  
Surface Ionization ◽  
Copper Isotopes ◽  
Ionization Method

Determination of the HNC to HCN abundance ratio in giant molecular clouds

1981 ◽  
Vol 249 ◽  
pp. 524 ◽  
Author(s):  
P. F. Goldsmith ◽  
W. D. Langer ◽  
J. Ellder ◽  
E. Kollberg ◽  
W. Irvine
Keyword(s):  
Molecular Clouds ◽  
Abundance Ratio ◽  
Giant Molecular Clouds
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