We have known for over three decades that the Sun has depleted its surface lithium. During this period it has become increasingly evident that mixing...

We present the first synthesis of Mn I lines in realistic multi-component magnetized quiet Sun atmospheres, including variation of magnetic field strength...

We report on ongoing study of the Mn-Cr systematics of individual Chainpur (LL3.4) chondrules and compare the results to those for bulk ordinary chondrites...

Mn-Cr data are reported for chondrules from the Bishunpur and Chainpur LL chondrites. It is shown that variations in Mn/Cr for these chondrules were established...

Being relatively rare, the properties of magnetic O stars are not fully understood. To date fewer than a dozen of these stars have been confirmed, making any...

O-type stars display rotational modulation of their photometric brightness due to surface features induced by fossil magnetic fields, and possibly through...

We analyze more than 5000 days of Sun-as-a-star radial velocity GOLF and intensity VIRGO observations to measure the visibilities of the I = 0, 1, 2, and 3...

The Apache Point Observatory Galactic Evolution Experiment (APOGEE) is obtaining high resolution ( 22,500), high signal-to-noise (> 100) spectra in the 1510...

The NRT is an international collaboration to design and build a leading astronomical facility in the optical and near infrared ranges for the emergent area of...