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Fluorine in AGB Carbon Stars Revisited
C. Abia, A. Recio-Blanco, P. de Laverny +3
A reanalysis of the fluorine abundance in three Galactic AGB carbon stars (TX Psc, AQ Sgr and R Scl) has been performed from the molecular HF (1-0) R9 line at 2.3358 m. High-res…
A Search for Very Active Stars in the Galaxy
G. Tsarevsky, J. A. De Freitas Pacheco, N. Kardashev +7
We report the first results of a systematic search near the plane of the Galaxy for the so called very active stars (VAS), which are characterized by a hard X-ray spectrum and acti…
s-Process Nucleosynthesis in Carbon Stars
C. Abia, I. Dominguez, R. Gallino +6
We present the first detailed and homogeneous analysis of the s-element content in Galactic carbon stars of N-type. Abundances of Sr,Y, Zr (low-mass s-elements, or ls) and of Ba, L…
VLT Observations of Turnoff stars in the Globular Cluster NGC 6397
F. Thévenin, C. Charbonnel, J. A. de Freitas Pacheco +4
VLT-UVES high resolution spectra of seven turnoff stars in the metal-poor globular cluster NGC 6397 have been obtained. Atmospheric parameters and abundances of several elements (L…
The formation of lithium lines in the atmospheres of super Li-rich AGB stars
Carlos Abia, Yakiv Pavlenko, Patrick de Laverny
The formation of lithium lines in the atmosphere of C-rich giants is discussed. LTE and NLTE approximations are used to model lithium lines in the spectra of super Li-rich AGB star…