The Sun's magnetic activity has steadily declined during its main-sequence life. While the
solar photospheric luminosity was about 30% lower 4.6 Gyr ago when the Sun arrived on …

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 …

While the strong anticorrelation between chromospheric activity and age has led to the
common use of the Ca ii H and K emission index (R^{\prime} _ {\mathrm {HK}\,}= L …

The last decade of direct imaging (DI) searches for sub-stellar companions has uncovered a
widely diverse sample that challenges the current formation models, while highlighting the …

We report on the results of the Sun in Time multiwavelength program (X-rays to UV) of solar
analogs with ages covering∼ 0.1–7 Gyr. The chief science goals are to study the solar …

We present a large, uniform analysis of young (≈ 10–150 Myr) ultracool dwarfs, based on
new high-precision infrared (IR) parallaxes for 68 objects. We find that low-gravity (vl-g) late …

We present a near-infrared (0.9–2.4 μm) spectroscopic study of 73 field ultracool dwarfs
having spectroscopic and/or kinematic evidence of youth (≈ 10–300 Myr). Our sample is …

We investigate how the observed large-scale surface magnetic fields of low-mass stars (∼
0.1–2 M⊙), reconstructed through Zeeman–Doppler imaging, vary with age t, rotation and X …

Abstract The Pulkovo Compilation of Radial Velocities (PCRV) has been made to study the
stellar kinematics in the local spiral arm. The PCRV contains weighted mean absolute radial …

We present a spectroscopic catalog of the 1564 brightest (J< 9) M dwarf candidates in the
northern sky, as selected from the SUPERBLINK proper motion catalog. Observations …