▪ Abstract Observational studies of low-mass stars during their early stages of evolution, from
protostars through the zero-age main sequence, show highly elevated levels of magnetic …

BANYAN Σ is a new Bayesian algorithm to identify members of young stellar associations
within 150 pc of the Sun. It includes 27 young associations with ages in the range∼ 1–800 …

We present results of a spectroscopic survey for new K-and M-type members of Scorpius–
Centaurus (Sco–Cen), the nearest OB Association (∼ 100–200 pc). Using an X-ray, proper …

We study the record of star formation activity within the dense cluster associated with the
Orion Nebula. The bolometric luminosity function of 900 visible members is well matched by …

Crucial steps in the formation of stars and planets can be studied only at mid‐to far‐infrared
wavelengths, where the Space Infrared Telescope (SIRTF) provides an unprecedented …

We present photometry at 3–24 μm for all known members of the Upper Scorpius
association (τ∼ 11 Myr) based on all images of these objects obtained with the Spitzer …

The connection between the nature of a protoplanetary disk and that of a debris disk is not
well understood. Dust evolution, planet formation, and disk dissipation likely play a role in …

We investigate the stellar population and star formation history of the Upper Scorpius OB
association, the most nearby region of recent massive star formation, over the full stellar …

We use a large sample of about 100 low-mass pre–main-sequence (PMS) stars in the Upper
Scorpius OB association to explore the star formation history and the initial mass function of …

Using the largest high-resolution spectroscopic sample to date of young, very low mass stars
and brown dwarfs, we investigate disk accretion in objects ranging from just above the …