Results 31 to 40 of about 17,626 (204)
Automatic Search of Cataclysmic Variables Based on LightGBM in LAMOST-DR7
Universe, 2021 The search for special and rare celestial objects has always played an important role in astronomy. Cataclysmic Variables (CVs) are special and rare binary systems with accretion disks.
Zhiyuan Hu +3 more
doaj +1 more source
Accretion in Cataclysmic Variable Stars [PDF]
, 2005 We consider accretion onto the white dwarfs in cataclysmic variables in relation to nova eruptions, dwarf nova outbursts, hibernation and non-radial oscillations.
Warner, Brian, Woudt, Patrick A.
openaire +2 more sources
Accretion in magnetic cataclysmic variables [PDF]
Astrophysics and Space Science, 1987 AbstractWe discuss the arguments in favour of the suggestion that polars (AM Her systems) and intermediate polars (IP’s) have magnetic fields of the same order of magnitude, and form one single class of objects. The period distribution of magnetic cataclysmic variables is well explained if they evolve the same way as non magnetic systems, IP’s becoming
Hameury, JM +3 more
openaire +2 more sources
A search for brown-dwarf like secondaries in cataclysmic variables [PDF]
, 2002 We present VTL/ISAAC infrared spectroscopy of a sample of short orbital period cataclysmic variables which are candidates for harboring substellar companions. We have detected the KI and NaI absorption lines of the companion star in VY Aqr.
Diaz, M. P., Mennickent, R. E.
core +3 more sources
Cataclysmic Variable Stars [PDF]
Highlights of Astronomy, 1998 The evolution of single stars on and away from the main sequence is well understood. A degenerate core is formed in a star as the star leaves the main sequence and expands to a giant with a radius typically 50 - 500 Ro . Observationally it is known that most stars are members of binary systems, and among these many have orbital periods less than 100 y.
openaire +1 more source
Theoretical spectra of cataclysmic variables [PDF]
Astrophysics and Space Science, 1987 AbstractWe present two methods of modelling accretion disks in dwarf novae. The first one determines self-consistently the structure of a disk together with the radiation field. The computed theoretical spectra agree well with the observations of the dwarf nova WX Hyi in quiescence as well as in superoutburst.
S. Křiž, I. Hybený
openaire +1 more source
Infrared spectroscopy of cataclysmic variables - II. Intermediate polars [PDF]
, 1996 We present infrared (0.97-2.45 micron) spectra of the intermediate polars PQ Gem (RE0751+14), BG CMi and EX Hya. The spectra show strong Paschen, Brackett and HeI emission lines from the accretion disc/stream.
Dhillon, V. S. +3 more
core +2 more sources
SW Sex Stars Then and Now: A Review [PDF]
, 2017 SW Sextantis stars are a class of cataclysmic variables originally defined via certain peculiar properties that they all have in common. In this article, I review our knowledge of these stars and show the way from a phenomenological classification to a ...
Schmidtobreick, Linda
core +1 more source
The pre-cataclysmic variable, LTT 560 [PDF]
Astronomy & Astrophysics, 2007 System parameters of the object LTT560 are determined in order to clarify its nature and evolutionary status. We apply time-series photometry to reveal orbital modulations of the light curve, time-series spectroscopy to measure radial velocities of features from both the primary and the secondary star, and flux-calibrated spectroscopy to derive ...
Tappert, Claus +5 more
openaire +4 more sources
MAGNETIC CATACLYSMIC VARIABLES: 25 YEARS OF EXCITING PERFOMANCE
Odessa Astronomical Publications, 2017 Exactly 25 years ago, Santiago Tapia has detected circular and linear polarization of AM Her varying with the same period as the photometric and spectral characteristics. This had lead to a discovery of unprecedentedly exotic binary systems, in which the
I. L Andronov
doaj +1 more source