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An 18.9 min blue large-amplitude pulsator crossing the ‘Hertzsprung gap’ of hot subdwarfs
Blue large-amplitude pulsators (BLAPs) represent a new and rare class of hot pulsating stars with unusually large amplitudes and short periods. The...
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Features of the Residual Velocity Ellipsoid of Hot Subdwarfs from the Gaia DR2 Catalog
The evolution of the parameters of the residual velocity ellipsoid of hot subdwarfs (HSDs) with their position relative to the Galactic plane is...
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Kinematics of Hot Subdwarfs from the Gaia DR2 Catalogue
We have studied the kinematic properties of the candidates for hot subdwarfs (HSDs) selected by Geier et al. from theGaiaDR2 catalogue. We have used...
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GALEX far-ultraviolet observations of metal-poor subdwarfs
Far-ultraviolet photometry derived from the GALEX satellite observatory has been compiled for a sample of metal-poor subdwarfs with
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A seven-Earth-radius helium-burning star inside a 20.5-min detached binary
Binary evolution theory predicts that the second common envelope ejection can produce low-mass (0.32–0.36 M ⊙ ) subdwarf B (sdB) stars inside...
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Determining the Characteristics of Lan 30 from Optical Observations
AbstractWe have performed a model analysis of the optical radiation from the young pre-cataclysmic variable Lan 30 and determined the set of its...
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Interstellar Extinction in Galactic Cirri in SDSS Stripe 82
AbstractWe have applied the method of star counts with Wolf diagrams to determine the interstellar extinction in five Galactic cirri in Sloan Digital...
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The discovery space of ELT-ANDES. Stars and stellar populations
The ArmazoNes high Dispersion Echelle Spectrograph (ANDES) is the optical and near-infrared high-resolution echelle spectrograph envisioned for the...
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Sources of Primary Cosmic Rays at an Energy of ~100 PeV
AbstractA comparative analysis of the spectra of primary cosmic rays (PCR) over Е 0 and the spectra of variable stars over the periods is performed...
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Merged white dwarfs and nucleosynthesis
Orbital decay mechanisms argue that double white dwarf mergers are inevitable, but extremely rare. Whilst some mergers result in explosions, the...
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A hot subdwarf–white dwarf super-Chandrasekhar candidate supernova Ia progenitor
Supernovae Ia are bright explosive events that can be used to estimate cosmological distances, allowing us to study the expansion of the Universe....
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Accurate mass and radius determinations of a cool subdwarf in an eclipsing binary
Cool subdwarfs are metal-poor low-mass stars that formed during the early stages of the evolution of our Galaxy. Because they are relatively rare in...
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Circumbinary Planets Around Evolved Stars
The current state of evidence for planets around evolved star binaries is reviewed. The small sizes of compact evolved stars leads to sharp features...
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Pavel Parenago and His Name in Science
AbstractThe short biography of one of the founders of stellar astronomy as a science, Pavel Petrovich Parenago, is presented. Considered the question...
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Search for Nearby Faint High Proper Motion Stars
A new high proper motion survey of the southern sky has been started using a re-reduction of APM measurements of UKST plates [15]. The main aim of...
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UOCS. V. UV study of the old open cluster NGC 188 using AstroSat
We present the UV photometry of the old open cluster NGC188 obtained using images acquired with Ultraviolet Imaging Telescope (UVIT) on board the...
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5D memberships and fundamental properties of the old open cluster NGC 6791 based on \(\mathit{Gaia}\)-DR2
This paper investigates reliable memberships and fundamental astrophysical properties of the old (∼8 Gyr) open cluster NGC 6791 using the astrometric...
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Absolute Ages of Globular Clusters and the VLT
In the past two years, the ages derived for the oldest globular clusters have significantly decreased, and our confidence in them increased, due on...
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Stars That Breathe
Stars which show a variation in their brightness are called variable stars. Pulsating variables are intrinsic variable stars whose brightness changes...