Results 21 to 30 of about 10,468 (212)
On the evidence for brown-dwarf secondary stars in cataclysmic variables [PDF]
, 2002 We present the K-band spectrum of the cataclysmic variable LL And, obtained using NIRSPEC on Keck-II. The spectrum shows no evidence for the absorption features observed by Howell & Ciardi (2001), which these authors used to claim a detection of a brown ...
Dhillon, V. S. +2 more
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Imaging the Secondary Stars in Cataclysmic Variables [PDF]
, 2001 The secondary, Roche-lobe filling stars in cataclysmic variables (CVs) are key to our understanding of the origin, evolution and behaviour of this class of interacting binary. We review the basic properties of the secondary stars in CVs and the observational and analysis methods required to detect them.
Dhillon, V.S., Watson, C.A.
openaire +3 more sources
High spectral resolution time-resolved optical spectroscopy of V893 Sco [PDF]
, 2001 We present high resolution time-resolved optical spectra of the high inclination short orbital period dwarf nova V893 Sco. We performed spectral analysis through radial velocity measurements, Doppler mapping, and ratioed Doppler maps.
E. Mason +12 more
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CCD-PHOTOMETRY OF CATACLYSMIC VARIABLE ES DRA IN 2001
Odessa Astronomical Publications, 2017 On the base of our 34-day photometry of ES Dra we found its ∼ 20 d light variations with amplitude of 1m.6 and suggest this star could belong to the nova-like subclass of cataclysmic variable stars.
A. V. Baklanov +2 more
doaj +1 more source
The Astronomical Journal, 2023 Accretion of mass onto a white dwarf (WD) in a binary system can lead to stellar explosions. If a WD accretes from stellar wind of a distant evolved giant in a symbiotic binary, it can undergo occasional outbursts in which it brightens by several ...
Augustin Skopal
doaj +1 more source
”ASYMPTOTIC PARABOLA” FITS FOR SMOOTHING GENERALLY ASYMMETRIC LIGHT CURVES
Odessa Astronomical Publications, 2016 A computer program is introduced, which allows to determine statistically optimal approximation using the "Asymptotic Parabola" fit, or, in other words, the spline consisting of polynomials of order 1,2,1, or two lines ("asymptotes") connected with a ...
K. D. Andrych +3 more
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SDSS J142625.71+575218.3: A Prototype for A New Class of Variable White Dwarf [PDF]
, 2008 We present the results of a search for pulsations in six of the recently discovered carbon-atmosphere white dwarf ("hot DQ") stars. On the basis of our theoretical calculations, the star SDSS J142625.71 + 575218.3 is the only object expected to pulsate ...
DeGennaro, Steven +5 more
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Disc–magnetosphere interactions in cataclysmic variable stars [PDF]
Proceedings of the International Astronomical Union, 2007 AbstractI review, from an observational perspective, the interactions of accretion discs with magnetic fields in cataclysmic variable stars. I start with systems where the accretion flows via a stream, and discuss the circumstances in which the stream forms into an accretion disc, pointing to stars which are close to this transition.
openaire +2 more sources
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
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Secondary Stars in CVs: The Theoretical Perspective [PDF]
, 1999 We apply the new generation of theoretical models of low-mass stars to secondaries in CVs, focussing on systems above the period gap. The models confirm that the spectral type should be a good indicator of the donor mass. The orbital period-spectral type
Baraffe, Isabelle, Kolb, Ulrich
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