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 …

This is the first of a series of papers presenting the Modules for Experiments in Stellar
Astrophysics (MESA) Isochrones and Stellar Tracks (MIST) project, a new comprehensive …

We present an analysis of the intrinsic colors and temperatures of 5–30 Myr old pre-main-
sequence (pre-MS) stars using the F0-through M9-type members of nearby, negligibly …

The high-energy emission from low-mass stars is mediated by the magnetic dynamo.
Although the mechanisms by which fully convective stars generate large-scale magnetic …

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 have derived ages for 13 young (< 30 Myr) star-forming regions and find that they are up
to a factor of 2 older than the ages typically adopted in the literature. This result has wide …

All-sky photometric time-series missions have allowed for the monitoring of thousands of
young (t age< 800 Myr) stars in order to understand the evolution of stellar activity. Here, we …

We present near-and mid-infrared photometry obtained with the Spitzer Space Telescope
of∼ 300 known members of the IC 348 cluster. We merge this photometry with existing …

One-dimensional stellar evolution models have been successful at representing the
structure and evolution of stars in diverse astrophysical contexts, but complications have …