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AGB stars of the intermediate-age LMC cluster NGC 1846 II. Dredge up along the AGB
T. Lebzelter, M. T. Lederer, S. Cristallo +3
Aims: We investigate the change in the surface abundance of C during the evolution along the AGB, aiming to constrain third dredge-up models. Methods: High-resolution, near-…
Modelling NIR molecular lines for Miras
W. Nowotny, S. Hoefner, T. Lebzelter +2
The atmospheric structure of Mira variables is considerably influenced by pulsation. Molecular absorption lines in the near-infrared (NIR), especially second overtone CO lines, sho…
4mu spectra of AGB stars I: Observations
T. Lebzelter, K. H. Hinkle, B. Aringer
We present times series of high resolution spectra of AGB variables at 4mu. Line profiles from the major contributors to the spectra of oxygen rich stars at 4mu, OH, HO, HCl an…
A comparison of light and velocity variations in Semiregular variables
T. Lebzelter, L. L. Kiss, K. H. Hinkle
NIR velocity variations are compared with simultaneous visual light curves for a sample of late-type semiregular variables (SRV). Precise radial velocity measurements are also pres…