The age of an individual star cannot be measured, only estimated through mostly model-
dependent or empirical methods, and no single method works well for a broad range of …

▪ Abstract Until the late 1990s the rich Hyades and the sparse UMa clusters were the only
coeval, comoving concentrations of stars known within 60 pc of Earth. Both are hundreds of …

Evolution of Stars and Stellar Populations is a comprehensive presentation of the theory of
stellar evolution and its application to the study of stellar populations in galaxies. Taking a …

There has been very considerable progress in research into low-mass stars, brown dwarfs
and extrasolar planets during the past few years, particularly since the fist edtion of this book …

We have performed a new and homogeneous analysis of all the Li data available in the
literature for main sequence stars (spectral-types from late F to K) in open clusters. In the …

Age determination is undertaken for nearby early type (BAF) stars, which constitute attractive
targets for high-contrast debris disk and planet imaging surveys. Our analysis sequence …

We report the selection and spectroscopic confirmation of 129 new late-type (SpT= K3–M6)
members of the Tucana–Horologium moving group, a nearby (d∼ 40 pc), young (τ∼ 40 …

Using a large sample of optical spectra of late-type dwarfs, we identify a subset of late-M
through L field dwarfs that, because of the presence of low-gravity features in their spectra …

We present results from an adaptive optics survey for substellar and stellar companions to
Sun-like stars. The survey targeted 266 F5–K5 stars in the 3 Myr–3 Gyr age range with …

We have obtained intermediate-resolution optical spectroscopy of 44 candidate very low
mass members of the nearby young open cluster IC 2391. Of these, 26 spectra are totally …