We present the time evolution of the stellar metallicity for SDSS galaxies, a sample that spans five orders of magnitude in stellar mass (10 − 10 M⊙). Assuming the Bruzual & Charlot (2003) stellar population models, we find that more massive galaxies are more metal-rich than less massive ones at all redshifts; the mass-metallicity relation is imprinted in galaxies from the epoch of formation. F...

We present a brief discussion of the evolution of disk galaxy stellar masses, sizes, rotation velocities, and star formation rates over the last eight billion years. Recent observations have failed to detect significant evolution in the stellar mass Tully-Fisher relation, stellar mass–size relation, and the stellar mass function of disk galaxies. Yet, most z < 1 star formation is in disks, and ...

Many exoplanetary systems containing hot Jupiters (HJs) exhibit significant misalignment between the spin axes of the host stars and the orbital angular momentum axes of the planets (“spin-orbit misalignment”). High-eccentricity migration involving LidovKozai oscillations of the planet’s orbit induced by a distant perturber is a possible channel for producing such misaligned HJ systems. Previou...

Ambartsumian was among the first researchers who recognized the importance and uniqueness of FUors, the term he coined for the rare outburst sources of the FU Orionis type. A wealth of observational data and concomitant theoretical work has advanced our understanding of FUors in the intervening almost 40 years. These results are summarized in this brief review, with special emphasis on observat...

The Square Kilometer Array will have the sensitivity, spatial resolution, and frequency resolution to provide new scientific knowledge of evolved stars. Four basic areas of scientific exploration are enhanced by the construction of the SKA: 1) detection and imaging of photospheric radio continuum emission and position correlation with maser distributions, 2) imaging of thermal dust emission aro...

Color-Magnitude Diagrams (CMDs) are plots that compare the magnitudes (luminosities) of stars in different wavelengths of light (colors). High nonlinear correlations among the mass, color, and surface temperature of newly formed stars induce a long narrow curved point cloud in a CMD known as the main sequence. Aging stars form new CMD groups of red giants and white dwarfs. The physical processe...

The exist.rnce of weakly interacting massive pa1·ticles (WHvlPs) has been suggested to explain both t.he dark matter conundrum and the sohu neutrino deficiency. Provided t.hat thf'y do not annihilat.f', these part.ides can be extremely efficient. in transporting energy inside stellar cori�s. They can supplement radiation and, under the specific circ:umstances which Wf' analyze, f'H'.'11 supprf'...