Results 31 to 40 of about 370 (81)

A Detection of an Anti-correlated Hard X-ray Lag in AM Herculis [PDF]

, 2010
Context {Earlier cross-correlation studies for AM Her were performed in various energy range from optical to X-ray and suggested that it mostly shows a high level of correlation but on occasion it shows a low level of correlation or uncorrelation.} Aims {
A. R. Rao, Aizu, Arnaud, Beardmore, Beuermann, C. S. Choi, Choudhury, Christian, Cropper, Cropper, Cropper, Frank, Hameury, Imamura, Jahoda, K. Sriram, King, Kuijpers, Lamb, Lei, Levine, Ramsay, Rothschild, Sriram, Sriram, Stella, Szkody, Tuohy, Watson, Woelk, Wu, Wu   +31 more
core   +2 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

Evidence for ablated flows in the shell of nova DQ Her

, 2007
High-resolution longslit Halpha spectra of the shell of the old nova DQ Her have been obtained with the William Herschel Telescope using the ISIS spectrograph.
A. P. Rushton, Anupama, Balman, Balman, Beer, Campbell, Downes, Duerbeck, Dyson, Gaposchkin, Gill, Herbig, Horne, Knigge, Lloyd, Lloyd, Martin, Mukai, Mustel, N. M. H. Vaytet, Patterson, Petitjean, Porter, Selvelli, Shlosman, Slavin, Starrfield, T. J. O'Brien, Walker, Williams, Wood, Young   +31 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

Broadband X-Ray Observations of the Periodic Optical Source ZTF J185139.81+171430.3 and Its Identification as a Massive Intermediate Polar

The Astrophysical Journal
We present X-ray observations of the periodic optical source ZTF J185139.81+171430.3 (hereafter ZTF J1851) by the XMM-Newton, NICER, and NuSTAR telescopes.
Ren Deng, Kaya Mori, Eric Miao, Gabriel Bridges, Charles J. Hailey, David A. H. Buckley, Gavin Ramsay, Dan Jarvis   +7 more
doaj   +1 more source

Magnetic Fields, Accretion, and the Central Engine of Gamma-Ray Bursts [PDF]

, 2005
I briefly review magnetic effects in accretion physics, and then go on to discuss a possible central engine for gamma-ray bursts. A rotating black hole immersed in a non-axisymmetric magnetic field experiences a torque trying to align spin and field.
King, A. R.
core   +2 more sources

A Multiwavelength Study of the 2025 Low State of the Intermediate Polar BG CMi

The Astrophysical Journal
We present multiwavelength observations of the first recorded low state of the intermediate polar BG CMi. Optical monitoring of the source by members of the American Association of Variable Star Observers reveals a decrease of ∼0.5 mag that lasted ∼50 ...
A. W. Shaw, K. Mukai, C. O. Heinke, C. G. Nixon, D. A. H. Buckley, P. A Dubovský, F.-J. Hambsch, J. Hilburn, K. Petrík, R. M. Plotkin, S. B. Potter, N. Rawat, T. Shahbaz, S. Dufoer, S. Dvorak, D. Messier, G. Myers, P. Nelson, R. Sabo, J. Ulowetz, T. Vanmunster   +20 more
doaj   +1 more source

A Broadband X-Ray Investigation of Fast-spinning Intermediate Polar CTCV J2056–3014

The Astrophysical Journal
We report on XMM-Newton, NuSTAR, and NICER X-ray observations of CTCV J2056–3014, a cataclysmic variable (CV) with one of the fastest-spinning white dwarfs (WDs) at P = 29.6 s.
Ciro Salcedo, Kaya Mori, Gabriel Bridges, Charles J. Hailey, David A. H. Buckley, Raimundo Lopes de Oliveira, Gavin Ramsay, Anke van Dyk   +7 more
doaj   +1 more source

Is FIRST J102347.6+003841 Really a Cataclysmic Binary? [PDF]

, 2005
The radio source FIRST J102347.6+003841 was presented as the first radio-selected cataclysmic. In the discovery paper, Bond et al. (2002) show a spectrum consistent with a magnetic AM Her-type system and a light curve with rapid, irregular flickering. In
Armstrong, E., Thorstensen, J. R.
core   +3 more sources

HST Observations of the Cataclysmic Variable Propeller LAMOST J024048.51+195226.9

The Astrophysical Journal
We present Hubble Space Telescope (HST) far-UV spectra and light curves of the magnetic cataclysmic variable (CV) LAMOST J024048.51+195226.9 (J0240), the second known CV propeller. The five consecutive HST orbits span a full 7.34 hr binary orbital period.
Jordan Tweddale, Peter Garnavich, Colin Littlefield, Paula Szkody   +3 more
doaj   +1 more source