Results 21 to 30 of about 365 (77)

Resolving the Periods of the Asynchronous Polar 1RXS J083842.1–282723

The Astrophysical Journal
1RXS J083842.1−282723 is a nearly synchronous magnetic cataclysmic variable with a simple X-ray light curve. While its orbital period was fairly well established at P _orb = 98.4 minutes from optical spectroscopy, indirect estimates of P _spin / P _orb ...
J. P. Halpern
doaj   +1 more source

The Origin of Soft X-rays in DQ Herculis

, 2003
DQ Herculis (Nova Herculis 1934) is a deeply eclipsing cataclysmic variable containing a magnetic white dwarf primary. The accretion disk is thought to block our line of sight to the white dwarf at all orbital phases due to its extreme inclination angle.
F. A. Ringwald, Herbig G. H., K. Mukai, Lloyd H. M., M. Still, Mewe R., Mewe R., Naylor T., Petitjean P., Slavin A. J., Wood J. H.   +10 more
core   +2 more sources

Spectroscopic Follow-up on Potential Magnetic Cataclysmic Variables

The Astronomical Journal
Spectroscopic observations of nine cataclysmic variables that have been postulated to contain magnetic white dwarfs were obtained to further characterize their classifications, orbital parameters, inclinations, and/or accretion properties.
Paula Szkody, Jan van Roestel, Paul A. Mason, Colin Littlefield, R. Michael Rich, Eric C. Bellm, Filipp D. Romanov, Brian F. Healy, Theophile Jegou du Laz, Russ R. Laher, Ben Rusholme   +10 more
doaj   +1 more source

Superhumps in Cataclysmic Binaries. XXIII. V442 Ophiuchi and RX J1643.7+3402

, 2002
We report the results of long observing campaigns on two novalike variables: V442 Ophiuchi and RX J1643.7+3402. These stars have high-excitation spectra, complex line profiles signifying mass loss at particular orbital phases, and similar orbital periods
Berto Monard, Borisov G. V., Brian Martin, Casares J., Darragh O'Donoghue, David A. Harvey, David R. Skillman, de Jager O. C., Dickinson R. J., Edward Beshore, Frank J., Greg Bolt, Iping R. C., Jerry Foote, John R. Thorstensen, Joseph Patterson, Kraicheva Z., Kuijpers J., Lewis M. Cook, Matt Wood, Neil Butterworth, Osaki Y., Panos Niarchos, Pringle J. E., Robert Rea, Robert E. Fried, Smak J., Terquem C., Tonny Vanmunster, Uemura Y., Warner B., Whitehurst R., Wickramasinghe D. T., William H. Fenton, Woelk U.   +34 more
core   +1 more source

Synthesis of C-rich dust in CO nova ourbursts [PDF]

, 2016
Context. Classical novae are thermonuclear explosions that take place in the envelopes of accreting white dwarfs in stellar binary systems. The material transferred onto the white dwarf piles up under degenerate conditions, driving a thermonuclear ...
Eid, Mounib F. El, Halabi, Ghina M., Jose, Jordi   +2 more
core   +4 more sources

A New Window for Studying Intermediate Polars and Tilted Accretion Disk Precession

The Astrophysical Journal
TV Col is a long-period eclipsing intermediate polar (IP) prototype star for the negative superhump (NSH) system. We investigate the eclipse minima, eclipse depth, and NSH amplitude based on TESS photometry.
Qi-Bin Sun, Sheng-Bang Qian, Li-Ying Zhu, Wen-Ping Liao, Er-Gang Zhao, Fu-Xing Li, Xiang-Dong Shi, Min-Yu Li   +7 more
doaj   +1 more source

TESS Light Curves of Cataclysmic Variables. VI. Intermediate Polars

The Astrophysical Journal Supplement Series
The long and (almost) continuous high-cadence light curves provided by the TESS space mission are ideally suited to study in detail brightness variations in stellar sources on the broad range of timescales between minutes and months.
Albert Bruch
doaj   +1 more source

Rapid Oscillations in Cataclysmic Variables. XVI. DW Cancri

, 2004
We report photometry and spectroscopy of the novalike variable DW Cancri. The spectra show the usual broad H and He emission lines, with an excitation and continuum slope characteristic of a moderately high accretion rate. A radial-velocity search yields
Brian Martin, David Messier, Eve Armstrong, Haberl F., Hellier C., Jeff Robertson, John R. Thorstensen, Jonathan Kemp, Joseph Patterson, Kim Y., Kopylov I. M., Robert E. Fried, Stepanian J. A., Tonny Vanmunster, Tut Campbell, Uemura Y.   +15 more
core   +1 more source

Nova M31N 2007-12b: Supersoft X-rays reveal an intermediate polar? [PDF]

, 2011
For the He/N nova M31N 2007-12b, we analyzed XMM-Newton EPIC and Chandra HRC-I observations of our monitoring program performed at intervals of ten days and added results of a XMM-Newton target of opportunity observation and Swift XRT observations.
Balucinska-Church, Bode, Bode, D. H. Hartmann, Della Valle, Diaz, Dobrotka, Drake, Drake, F. Haberl, G. Sala, Gehrels, Greiner, Hachisu, Hachisu, Hachisu, Hachisu, Hamada, Henze, Henze, Holland, Ibarra, Jansen, Jośe, Kaaret, Kahabka, King, Kong, Lee, M. Della Valle, M. Henze, M. Hernanz, MacDonald, Mason, Massey, Ness, Ness, Ness, Orio, Osborne, Osborne, Page, Patterson, Pietsch, Pietsch, Pietsch, Pietsch, Poole, Rauch, Rauch, Rudy, Sala, Sala, Sala, Shafter, Stanek, Stark, Strüder, Suh, Trudolyubov, Trümper, Turner, W. Pietsch, Weisskopf, Williams, Wilms, Yaron   +66 more
core   +3 more sources

X-Ray Polarimetry of Accreting White Dwarfs: A Case Study of EX Hydrae

The Astrophysical Journal
We present the first first X-ray polarization measurements of a white dwarf (WD), the intermediate polar EX Hya. We measured significant polarization only in the 2–3 keV energy band with a polarization degree of 8% at a 3 σ significance.
Sean J. Gunderson, Swati Ravi, Herman L. Marshall, Dustin K. Swarm, Richard Ignace, Yael Nazé, David P. Huenemoerder, Pragati Pradhan   +7 more
doaj   +1 more source