Results 1 to 10 of about 557 (106)
Stark Broadening of Carbon and Oxygen Lines in Hot DQ White Dwarf Stars: Recent Results and Applications [PDF]
Open Astronomy, 2011 White dwarf stars are traditionally found to have surface compositions made primarily of hydrogen or helium. However, a new family has recently been uncovered, the so-called hot DQ white dwarfs, which have surface compositions dominated by carbon and ...
Dufour P. +3 more
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Two New Variable Hot DQ Stars [PDF]
The Astrophysical Journal, 2008 Accepted for publication in ApJ Letters (14 pages, 5 figures, 2 tables)
Barlow, B. N. +3 more
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WZ Sagittae as a DQ Herculis star [PDF]
Monthly Notices of the Royal Astronomical Society, 1999 8 pages, 5 figures; accepted for publication in ...
Lasota, Jean-Pierre +2 more
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EX Hya: the slowest DQ Her star? [PDF]
Monthly Notices of the Royal Astronomical Society, 1985 Resultats d'un programme photometrique de la variable cataclysmique EX Hya.
F. Jablonski, I. C. Busko
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The Astrophysical Journal, 2023 We report timing and broadband spectral analysis of a Galactic X-ray source, CXOGBS J174517.0−321356 (J1745), with a 614 s periodicity. Chandra discovered the source in the direction of the Galactic Bulge.
Benjamin Vermette +11 more
doaj +1 more source
The Astronomical Journal, 2023 There have been relatively few published long-duration, uninterrupted light curves of magnetic cataclysmic variable stars in which the accreting white dwarf’s rotational frequency is slightly desynchronized from the binary orbital frequency.
Colin Littlefield +9 more
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DQ white-dwarf stars with low C abundance: possible progenitors [PDF]
Astronomy & Astrophysics, 2006 The present paper focuses on the evolution of hydrogen-deficient white dwarfs with the aim of exploring the consequences of different initial envelope structures on the carbon abundances expected in helium-rich, carbon-contaminated DQ white dwarfs. In particular, the evolutionary link between the DQs with low detected carbon abundances and the PG1159 ...
Scóccola, Claudia Graciela +4 more
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The Astrophysical Journal Letters, 2023 When the accreting white dwarf in a magnetic cataclysmic variable star (mCV) has a field strength in excess of 10 MG, it is expected to synchronize its rotational frequency to the binary orbit frequency, particularly at small binary separations, due to ...
Colin Littlefield +8 more
doaj +1 more source
Spin-Up and Magnetic Fields in DQ Her Stars [PDF]
International Astronomical Union Colloquium, 1983 ABSTRACTWe have carried out a detailed comparison of the spin-up behavior of the recently discovered faint long-period X-ray sources, using the accretion torque theory of Ghosh and Lamb. We confirm that these sources are degenerate dwarfs. We find that they have magnetic fields B ~ 1 x 106 G, an order of magnitude smaller than those of AM Her stars. On
D. Q. Lamb, J. Patterson
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Rapid Evolution of the White Dwarf Pulsar AR Scorpii
The Astrophysical Journal Letters, 2023 Analysis of AR Sco optical light curves spanning 9 yr shows a secular change in the relative amplitudes of the beat pulse pairs generated by the two magnetic poles of its rotating white dwarf.
Peter Garnavich +6 more
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