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SPHERE dynamical and spectroscopic characterization of HD142527B
R. Claudi, A. -L. Maire, D. Mesa +50
We detect the accreting low-mass companion HD142527B at a separation of 73 mas (11.4 au) from the star. No other companions with mass greater than 10 MJ are visible in the field of…
Mapping of shadows cast on a protoplanetary disk by a close binary system
V. D'Orazi, R. Gratton, S. Desidera +47
For a comprehensive understanding of planetary formation and evolution, we need to investigate the environment in which planets form: circumstellar disks. Here we present high-cont…
The s process in AGB stars as constrained by a large sample of Barium stars
B. Cseh, M. Lugaro, V. D'Orazi +8
Context. Barium (Ba) stars are dwarf and giant stars enriched in elements heavier than iron produced by the slow neutron-capture process (s process). They belong to binary systems…
Radial velocity and chemical composition of evolved stars in the open clusters NGC 6940 and Tombaugh 5
Martina Baratella, Giovanni Carraro, Valentina D'Orazi +1
We present and discuss medium resolution (R 13000), high signal-to-noise (), spectroscopic observations in the field of the open clusters NGC\…
The GALAH survey and Gaia DR2: dissecting the stellar disc's phase space by age, action, chemistry and location
Joss Bland-Hawthorn, Sanjib Sharma, Thor Tepper-Garcia +24
We use the second data releases of the ESA Gaia astrometric survey and the high-resolution GALAH spectroscopic survey to analyse the structure of our Galaxy's disc components. With…
On the AGB stars of M 4: A robust disagreement between spectroscopic observations and theory
B. T. MacLean, S. W. Campbell, A. M. Amarsi +7
Several recent spectroscopic investigations have presented conflicting results on the existence of Na-rich asymptotic giant branch (AGB) stars in the Galactic globular cluster M4 (…