The chemical composition of R Coronae Borealis and XX Camelopardalis
1982; IOP Publishing; Volume: 261; Linguagem: Inglês
10.1086/160370
ISSN1538-4357
AutoresP. L. Cottrell, D. L. Lambert,
Tópico(s)Gamma-ray bursts and supernovae
Resumoview Abstract Citations (97) References (44) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The chemical composition of R CrB and XX Cam. Cottrell, P. L. ; Lambert, D. L. Abstract The R Coronae Borealis stars R CrB and XX Cam are examined using extensive high-resolution Reticon data. Effective temperatures, values of log g, microturbulent velocities, and C/He values are determined, along with elemental abundances and abundance ratios for a wide range of species, including the light and heavy s-process elements. Helium- and carbon-rich models are employed, as is an appropriate model atmosphere code. The evolutionary history of R CrB stars is discussed in detail. It is concluded that both CNO cycle and 3-alpha processed material must have been mixed into the observable layers. The He core and He shell flashes are suggested as possible triggers for the mixing and for the extensive mass loss required to expose the heavily processed layers. Publication: The Astrophysical Journal Pub Date: October 1982 DOI: 10.1086/160370 Bibcode: 1982ApJ...261..595C Keywords: Abundance; Cosmochemistry; Nuclear Fusion; R Coronae Borealis Stars; Stellar Mass Ejection; Variable Stars; Spectral Line Width; Stellar Atmospheres; Stellar Evolution; Supergiant Stars; Astrophysics full text sources ADS | data products SIMBAD (3)
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