SIMBAD references

2013ApJ...768L..11H - Astrophys. J., 768, L11 (2013/May-1)

Nitrogen isotopes in asymptotic giant branch carbon stars and presolar SiC grains: a challenge for stellar nucleosynthesis.

HEDROSA R.P., ABIA C., BUSSO M., CRISTALLO S., DOMINGUEZ I., PALMERINI S., PLEZ B. and STRANIERO O.

Abstract (from CDS):

Isotopic ratios of C, N, Si, and trace heavy elements in presolar SiC grains from meteorites provide crucial constraints to nucleosynthesis. A long-debated issue is the origin of the so-called A+B grains, as of yet no stellar progenitor thus far has been clearly identified on observational grounds. We report the first spectroscopic measurements of 14N/15N ratios in Galactic carbon stars of different spectral types and show that J- and some SC-type stars might produce A+B grains, even for 15N enrichments previously attributed to novae. We also show that most mainstream grains are compatible with the composition of N-type stars, but in some cases might also descend from SC stars. From a theoretical point of view, no astrophysical scenario can explain the C and N isotopic ratios of SC-, J-, and N-type carbon stars together, as well as those of many grains produced by them. This poses urgent questions to stellar physics.

Abstract Copyright:

Journal keyword(s): nuclear reactions, nucleosynthesis, abundances - stars: carbon - stars: abundances

Simbad objects: 37

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2021.04.13-16:35:19

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