Recent surveys have demonstrated the existence of several short-period binary systems
containing two white dwarfs. Following orbital decay by gravitational-wave radiation, such …

Helium-rich subdwarf B (He-sdB) stars represent a small group of low-mass hot stars with
luminosities greater than those of conventional sdB stars, and effective temperatures lower …

UVO 0825+ 15 is a hot bright helium-rich subdwarf which lies in K2 Field 5 and in a sample
of intermediate helium-rich subdwarfs observed with Subaru/HDS. The K2 light curve shows …

Hot subdwarfs represent a group of low-mass helium-burning stars formed through binary-
star interactions and include some of the most chemically peculiar stars in the Galaxy. Stellar …

The discovery of extremely zirconium-and lead-rich surfaces amongst a small subgroup of
hot subdwarfs has provoked questions pertaining to chemical peculiarity in hot star …

We perform stellar evolution calculations of the remnant of the merger of two He white
dwarfs (WDs). Our initial conditions are taken from hydrodynamic simulations of double WD …

The majority of hot subdwarf stars are low-mass core-helium-burning stars. Their
atmospheres are generally helium deficient; however, a minority have extremely helium-rich …

SALT spectra of the helium-rich hot subdwarf EC 22536− 5304 show strong absorption lines
of triply ionized lead. Analysis of the HRS spectrum and a follow-up SALT/RSS spectrum …

Context. Mass-loss rate is one of the most important stellar parameters. Mass loss via stellar
winds may influence stellar evolution and modifies stellar spectrum. Stellar winds of …

Subluminous B stars come in a variety of flavours including single stars, close and wide
binaries, and pulsating and non-pulsating variables. A majority have helium-poor surfaces …