Results 71 to 80 of about 36,595 (260)
The Magnetic Nature of the Cataclysmic Variable Period Gap [PDF]
Astrophysical Journal, 2018 One of the most important problems in the context of cataclysmic variables (CVs) is the lack of observations of systems with periods between 2 and 3.12 hr, known as the period gap.
C. Garraffo +4 more
semanticscholar +1 more source
On the secondary star of the cataclysmic variable 1RXS J094432.1+035738 [PDF]
, 2001 We present V and Rc band photometry and optical near-infrared spectroscopy of the cataclysmic variable 1RXS J094432.1+035738. We detected features of a cool secondary star, which can be modeled with a red dwarf of spectral type M2 (+0.5 -1.0) V at a ...
B. T. Gänsicke +15 more
core +2 more sources
The Periods of Cataclysmic Variable Stars [PDF]
International Astronomical Union Colloquium, 1983 To understand the structure and evolution of the cataclysmic variables, we will need accurate values for their masses, dimensions, mass transfer rates, and other physical properties. Unfortunately, despite an abundance of observational data on these systems, there is a severe dearth of reliable, quantitative information about their fundamental physical
openaire +1 more source
KIC 9406652: A laboratory for tilted disks in cataclysmic variable stars
Nippon Tenmon Gakkai obun kenkyu hokoku, 2020 KIC 9406652 is a cataclysmic variable, sub-classified as an “IW And-type” star, which shows repeated standstills with oscillatory variations terminated by brightening.
M. Kimura, Y. Osaki, Taichi Kato
semanticscholar +1 more source
The Identification of Hydrogen-deficient Cataclysmic Variable Donor Stars [PDF]
Astrophysical Journal, 2018 We have used ATLAS12 to generate hydrogen-deficient stellar atmospheres to allow us to construct synthetic spectra to explore the possibility that the donor stars in some cataclysmic variables (CVs) are hydrogen deficient.
T. Harrison
semanticscholar +1 more source
1RXS J180834.7+101041 is a new cataclysmic variable with non-uniform disc
, 2010 Results of photometric and spectroscopic investigations of the recently discovered disc cataclysmic variable star 1RXS J180834.7+101041 are presented. Emission spectra of the system show broad double peaked hydrogen and helium emission lines.
Bikmaev, I. F. +5 more
core +1 more source
Variable stars in the open cluster NGC 6791 and its surrounding field [PDF]
, 2007 Aims: This work presents a high--precision variability survey in the field of the old, super metal-rich open cluster NGC 6791. Methods: The data sample consists of more than 75,000 high-precision CCD time series measurements in the V band obtained ...
Bedin, L. R. +9 more
core +1 more source
The ethics of responding to democratic backsliding abroad
American Journal of Political Science, EarlyView.Abstract The past decade has seen a marked shift as many previously liberal democratic states have backslidden, taking authoritarian turns. How should liberal actors respond to democratic backsliding by others? Although it might seem that it is vital for liberal actors to react robustly to avoid complicity or to maintain their liberal integrity, this ...
James Pattison
wiley +1 more source
WD 1202-024: the shortest-period pre-cataclysmic variable [PDF]
, 2017 Among the 28,000 targeted stars in K2 Field 10 is the white dwarf WD 1202-024 (EPIC 201283111), first noted in the SDSS survey (SDSS 120515.80-024222.7). We have found that this hot white dwarf (Teff = 22,640 K) is in a very close orbit (P = 71 min) with
S. Rappaport +10 more
semanticscholar +1 more source
Comparisons of MHD propeller model with observations of cataclysmic variable AE Aqr [PDF]
Monthly notices of the Royal Astronomical Society, 2018 We have developed a numerical magnetohydrodynamic (MHD) model of the propeller candidate star AE Aqr using axisymmetric MHD simulations. We suggest that AE Aqr is an intermediate polar-type star, where the magnetic field is relatively weak and an ...
A. Blinova +4 more
semanticscholar +1 more source