The 12C/13C-ratio in cool carbon stars

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dc.creatorSchoeier, F. L.
dc.creatorOlofsson, H.
dc.date2000-05-17
dc.date.accessioned2026-07-07T01:53:37Z
dc.date.available2026-07-07T01:53:37Z
dc.descriptionWe present observations of circumstellar millimetre-wave 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/13C-ratios are compared with the photospheric results, obtained with different methods. Our estimates agree well with those of Lambert et al. (1986). It is shown that a straightforward determination of the 12CO/13CO-ratio from observed line intensity ratios is often hampered by optical depth effects, and that a detailed radiative transfer analysis is needed in order to determine reliable isotope ratios.
dc.descriptionAccepted for publication in A&A
dc.identifierhttps://arxiv.org/abs/astro-ph/0005360
dc.identifierhttp://arxiv.org/abs/astro-ph/0005360
dc.identifierA&A (2000), 359, 586
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/1029
dc.subjectAstrophysics
dc.titleThe 12C/13C-ratio in cool carbon stars
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