Search
Search Results
-
Understanding structure in line-driven stellar winds using ultraviolet spectropolarimetry in the time domain
The most massive stars are thought to lose a significant fraction of their mass in a steady wind during the main-sequence and blue supergiant phases....
-
Dynamic Model Atmospheres of Cool Giants
Cool giant stars are highly dynamical objects, and complex micro-physical processes play an important role in their extended atmospheres and winds....
-
Superfast Line Profile Variations in the Spectra of OBA Stars. III. A0 Star α2 Cvn, New Results
Abstract —This work is a continuation of the studies of the ultrafast variability of line profiles in the spectra of early-type stars. Line profile...
-
Astrophysical Constraints on Dense Matter in Neutron Stars
Ever since the discovery of neutron stars it has been realized that they serve as probes of a physical regime that cannot be accessed in...
-
High-Frequency Variability in Neutron-Star Low-Mass X-ray Binaries
Binary systems with a neutron-star primary accreting from a companion star display variability in the X-ray band on time scales ranging from years to...
-
X-ray Polarimetry-Timing
X-ray polarimetry-timing is the characterization of rapid variability in the X-ray polarization degree and angle. As for the case of spectral-timing,...
-
Ultraviolet spectropolarimetric diagnostics of hot star magnetospheres
Several space missions and instruments for UV spectropolarimetry are in preparation, such as the proposed NASA MIDEX Polstar project, the proposed...
-
Polarimetric detection of non-radial oscillation modes in the β Cephei star β Crucis
Here we report the detection of polarization variations due to non-radial modes in the β Cephei star β Crucis. In so doing we confirm 40-year-old...
-
Instability in the System of the Distant Post-AGB Star LS III +52°24 (IRAS 22023+5249)
AbstractThe optical spectra of the B-supergiant LS III +52°24 (IRAS 22023+5249) obtained at the 6-m BTA telescope with a resolution
... 
-
Scientific Context
This chapter provides the scientific context for the thesis. First, we introduce the equations of stellar structure and some internal stellar...
-
Dispersed Matter Planet Project discoveries of ablating planets orbiting nearby bright stars
Some highly irradiated close-in exoplanets orbit stars showing anomalously low stellar chromospheric emission. We attribute this deficit to...
-
The nearest neutron star candidate in a binary revealed by optical time-domain surveys
The near-Earth (within ∼100 pc) supernova explosions in the past several million years can cause the global deposition of radioactive elements (e.g., 60...
-
Accreting White Dwarfs
White dwarfs are the most common endpoints of stellar evolution. They are often found in close binary systems in which the white dwarf is accreting...
-
Searches for continuous-wave gravitational radiation
Now that detection of gravitational-wave signals from the coalescence of extra-galactic compact binary star mergers has become nearly routine, it is...
-
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...
-
Stellar Coronae
The vast majority of “normal” hydrogen-burning stars are of mass equal to or lower than that of our Sun, and they share with our host star the...
-
On Cepheid Distances in the \({H}_{0}\) Measurement
Classical Cepheids were the first stellar standard candles and have played a crucial role for astronomical distance measurements ever since the...
-
Analysis of the Distance Scales by Cepheids from the Gaia EDR3 Catalogue Data
AbstractWe study the kinematics of a sample of classical Cepheids younger than 120 Myr. For these stars, the estimates of distances taken from...
-
Search for Ultrafast Variability of Line Profiles in the Spectrum of ε Per A
The results of observations at high temporal resolution (∆T~4 min) of the B0.5V star ε Per A on the 2-m telescope of the Terskol Observatory are...
-
Bipolar Nebula AFGL 2688 in the System of Post-AGB Star V1610 Cyg
AbstractWe present a survey of the results of photometric and spectral observations of a nebula AFGL 2688 in the system of post-AGB star V1610 Cyg....
