Context. In the last 15 years different ground-based spectroscopic surveys have been
started (and completed) with the general aim of delivering stellar parameters and elemental …

When main-sequence stars expand into red giants, they are expected to engulf close-in
planets,,,–. Until now, the absence of planets with short orbital periods around post …

Context. Lithium-rich giant stars are rare and their existence poses a challenge to our
understanding of stellar structure and evolution. In particular, open clusters aptly constrain …

Context. With its origin coming from several sources (Big Bang, stars, cosmic rays) and given
its strong depletion during its stellar lifetime, the lithium element is of great interest as its …

We present WIYN/Hydra spectra of 34 red giant candidate members of NGC 188, which,
together with WOCS and Gaia data yield 23 single members, 6 binary members, 4 single …

Context. Although not predicted by standard stellar evolution, the surface abundance of light
elements, such as lithium (Li), carbon, and nitrogen, changes during the red giant branch …

With the unprecedented increase in the number of known star clusters, quick and modern
tools are needed for their analysis. In this work, we develop an artificial neural network …

Context. Recent evidence from spectroscopic surveys points towards the presence of a
metal-poor, young stellar population in the low-α, chemically thin disk. In this context, the …

Known sources of lithium (Li) in the universe include the Big Bang, novae, asymptotic giant
branch stars, and cosmic-ray spallation. During their longer-lived evolutionary phases, stars …

Photometric time series gathered by space telescopes such as CoRoT and Kepler allow to
detect solar-like oscillations in red giant stars and to measure their global seismic …