A significant percentage of OB stars are runaways, so we can expect a similar percentage of their evolved descendants to also be runaways. However, recognizing such stars presents its own set of challenges, as these older, more evolved stars will have drifted farther from their birthplace, and thus their velocities might not be obviously peculiar. Several Galactic red supergiants (RSGs) have be...

High-mass X-ray binaries (HMXBs) represent an important phase in the evolution of massive binary systems. HMXBs provide unique diagnostics to test massive-star evolution, to probe the physics of radiationdriven winds, to study the process of mass accretion, and to measure fundamental parameters of compact objects. As a consequence of the supernova explosion that produced the neutron star (or bl...

We present a catalog of 3354 candidate young stars within 500 pc that appear to have been ejected from their parent associations with relative speeds >5 km/s. These candidates homogeneously selected through performing 2d spherical traceback previously identified pre-main sequence various star forming regions, ensuring the age as well estimated is consistent population, and excluding contaminant...

Rapid bursts at optical wavelengths have been reported for several accreting white dwarfs, where the luminosity can increase by up to a factor 30 in less than an hour fading on timescales of hours, and energy release reach $\approx10^{39}$ erg ("micronovae"). Several systems also shown these be semi-recurrent days months temporal profiles strongly resemble those observed Type-I X-ray neutron st...