IMPROVED LINE DATA FOR THE SWAN SYSTEM 12 C 13 C ISOTOPOLOGUE
نویسندگان
چکیده
منابع مشابه
The 12 C / 13 C - ratio in cool carbon stars ?
We present observations of circumstellar millimetrewave 13CO line emission towards a sample of 20 cool carbon stars. Using a detailed radiative transfer model we estimate the circumstellar 12CO/13CO-ratios, which we believe accurately measure the important stellar 12C/13C-ratios. For those optically bright carbon stars where it is possible, our derived 12C/13Cratios are compared with the photos...
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The behaviour of the ∆ν=2 CO bands around 2.3 μm was examined by comparing observed and synthetic spectra in stars in globular clusters of different metallicity. Changes in the C/C isotopic ratio and the carbon abundances were investigated in stars from 3500–4900 K in the galactic globular clusters M71, M5, M3 and M13, covering the metallicity range from –0.7 to –1.6. We found relatively low ca...
متن کاملCoupling and higher - order effects in the 12 C ( d , p ) 13 C and 13 C ( p , d ) 12 C reactions
Coupled-channel calculations are performed for the 12C(d,p)13C and 13C(p,d)12C reactions between 7 and 60 MeV to study the effect of inelastic couplings in transfer reactions. The effect of treating transfer beyond Born approximation is also addressed. The coupling to the 12C 2+ state is found to change the peak cross section by up to 15%. Effects beyond Born approximation lead to a significant...
متن کاملProxies and uncertainties for 13 C / 12 C ratios of atmospheric reactive gases emissions
We provide a comprehensive review of the proxy data on the C/C ratios and uncertainties of emissions of reactive carbonaceous compounds into the atmosphere, with a focus on CO sources. Based on an evaluated setup of the EMAC model, we derive the isotope-resolved dataset of its emission inventory for the 1997 2005 period. Additionally, we 10 revisit the calculus required for the correct derivati...
متن کاملHigh mass - loss carbon stars and the evolution of the local 12 C / 13 C ratio
The 12 C/ 13 C ratio has been measured in a sample of 10 carbon stars with high mass-loss rates, of ≥ 10 −5 M yr −1. This sample is complete for northern hemisphere carbon stars within ∼ 1 kpc of the Sun. Using the J=2–1 rotational lines of CO and 13 CO, the intensity ratio of 12 CO/ 13 CO is found to be 17 ± 11 for the sample, and the deduced 12 C/ 13 C abundance ratio, after corrections for C...
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ژورنال
عنوان ژورنال: The Astrophysical Journal Supplement Series
سال: 2014
ISSN: 0067-0049,1538-4365
DOI: 10.1088/0067-0049/211/1/5