Results 31 to 40 of about 453,245 (300)

The long period intermediate polar 1RXS J154814.5-452845 [PDF]

Astronomy & Astrophysics, 2006
We present the first time resolved medium resolution optical spectroscopy of the recently identified peculiar Intermediate Polar (IP) 1RXSJ154814.5-452845, which allows us to precisely determine the binary orbital period (Porb=9.87+/-0.03hr) and the white dwarf spin period Pspin=693.01+/-0.06s).
de Martino, D., Bonnet-Bidaud, J.-M., Mouchet, M., Gaensicke, B.T., Haberl, F., Motch, C.   +5 more
openaire   +6 more sources

The Spin-period History of Intermediate Polars

The Astrophysical Journal, 2020
Abstract We report the detailed history of spin-period changes in five intermediate polars (DQ Herculis, AO Piscium, FO Aquarii, V1223 Sagittarii, and BG Canis Minoris) during the 30–60 yr since their original discovery. Most are slowly spinning up, although there are sometimes years-long episodes of spin-down.
Joseph Patterson, Enrique de Miguel, Jonathan Kemp, Shawn Dvorak, Berto Monard, Franz-Josef Hambsch, Tonny Vanmunster, David R. Skillman, David Cejudo, Tut Campbell, George Roberts, Jim Jones, Lewis M. Cook, Greg Bolt, Robert Rea, Joseph Ulowetz, Thomas Krajci, Kenneth Menzies, Simon Lowther, William Goff, William Stein, Matt A. Wood, Gordon Myers, Geoffrey Stone, Helena Uthas, Emir Karamehmetoglu, Jim Seargeant, Jennie McCormick   +27 more
openaire   +4 more sources

V902 Monocerotis: A likely disc-accreting intermediate polar [PDF]

Astronomy & Astrophysics, 2018
Aims. We aim to confirm whether the eclipsing cataclysmic variable (CV) V902 Mon is an intermediate polar (IP), to characterise its X-ray spectrum and flux, and to refine its orbital ephemeris and spin period. Methods. We performed spectrographic observations of V902 Mon in 2016 with the 2.2 m Calar Alto telescope, and X-ray photometry and spectroscopy
Worpel, H., Schwope, A. D., Traulsen, I., Mukai, K., Ok, S.   +4 more
openaire   +3 more sources

V2487 Oph 1998: a post nova in an intermediate polar

EPJ Web of Conferences, 2014
V2487 Oph (Nova Oph 1998) is a classical nova that exploded in 1998. XMM-Newton observations performed between 2 and 9 years after the explosion showed emission related to restablished accretion, and indicative of a magnetic white dwarf.
Hernanz Margarita
doaj   +1 more source

Discovery of circular polarization in the Intermediate Polar 1WGA J1958.2+3232 [PDF]

Astronomy & Astrophysics, 2001
We report on UBVRI polarimetry of the recently identified Intermediate Polar 1WGA J1958.2+3232, carried out on 2000 August, 4-6 at the Nordic Optical Telescope. Circular polarization was detected in R and I bands with an increasing absolute mean value with wavelength.
USLENGHI M, TOMMASI L, TREVES, ALDO, PIIROLA V, REIG P.   +4 more
openaire   +4 more sources

On the accretion mode of the intermediate polar V1025 Centauri [PDF]

, 2002
The long white-dwarf spin periods in the magnetic cataclysmic variables EX Hya and V1025 Cen imply that if the systems possess accretion discs then they cannot be in equilibrium. It has been suggested that instead they are discless accretors in which the
Buckley D. A. H., Coel Hellier, Cordova F. A., David A. H. Buckley, Dhillon V. S., Graham A. Wynn, Hellier C., Hellier C., Hellier C., Hellier C., Hellier C., Hellier C., Jablonski F., King A. R., King A. R., Marsh T. R., Wynn G. A., Wynn G. A., Wynn G. A.   +18 more
core   +2 more sources

Intermediate Polars in Low States [PDF]

, 2005
Although no intermediate polar (IP) has been observed in recent years to descend into a state of low rate of mass transfer, there are candidate stars that appear to be already in intermediate and low states. V709 Cas is probably an intermediate state IP; NSV 2872 appears to be a low state IP, and will probably resemble the long orbital period IP V1072 ...
openaire   +2 more sources

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

Discless Accretion in Intermediate Polars? [PDF]

International Astronomical Union Colloquium, 1997
AbstractI review the evidence for disc and discless accretion in the asynchronous magnetic CVs, the intermediate polars (IPs). The presence and relative amplitudes of the spin and synodic (beat) X-ray periods, and related orbital sidebands, are very model dependent, and support disc accretion dominating in all the well-studied IPs.
openaire   +1 more source

COMPILATION OF MOMENTS OF SPIN MAXIMA OF THE INTERMEDIATE POLAR EX HYA

Odessa Astronomical Publications, 2013
We present a compilation of the spin maxima of the intermediate polar EX Hya determined using the same methods for our own observations from the Tzec Maun observatory, published observations from the SuperWASP, ASAS and AAVSO databases. For completeness,
V. V. Breus, I. L. Andronov
doaj   +1 more source