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Lithium abundances along the RGB: FLAMES-GIRAFFE spectra of a large sample of low-mass Bulge stars
Thomas Lebzelter, Stefan Uttenthaler, Maurizio Busso +2
Context: A small number of K-type giants on the red giant branch (RGB) is known to be very rich in lithium (Li). This fact is not accounted for by standard stellar evolution theory…
Elemental abundances in AGB stars and the formation of the Galactic bulge
Stefan Uttenthaler, Joris A. D. L. Blommaert, Thomas Lebzelter +4
We obtained high-resolution near-IR spectra of 45 AGB stars located in the Galactic bulge. The aim of the project is to determine key elemental abundances in these stars to help co…
Hipparcos Variable Star Detection and Classification Efficiency
P. Dubath, I. Lecoeur-Taïbi, L. Rimoldini +14
A complete periodic star extraction and classification scheme is set up and tested with the Hipparcos catalogue. The efficiency of each step is derived by comparing the results wit…
Long period variables and mass loss in the globular clusters NGC 362 and NGC 2808
Thomas Lebzelter, Peter Wood
The pulsation periods of long period variables (LPVs) depend on their mass and helium abundance as well as on their luminosity and metal abundance. Comparison of the observed perio…
Random forest automated supervised classification of Hipparcos periodic variable stars
P. Dubath, L. Rimoldini, M. Süveges +14
We present an evaluation of the performance of an automated classification of the Hipparcos periodic variable stars into 26 types. The sub-sample with the most reliable variability…