Results 51 to 60 of about 4,939 (124)

TESS Observations of Outbursts on Polars—Superflares

The Astrophysical Journal
Flare events are magnetic activities on the stellar surface, which can provide us with information about the accretion behavior and evolution of polars. In this paper, we search for flare events on polars from all the available 2 minute cadence TESS data
Qishan Wang, Xiaohui Fang, Shengbang Qian   +2 more
doaj   +1 more source

X-Ray and Infrared Analysis on a Faint Polar RX J1745.5-2905

The Astrophysical Journal
RX J1745.5-2905 is a faint and distant polar below the period gap. It was observed intensively in X-ray by Chandra, and its X-ray data reveal frequent brightness transitions between low and high states like we found in the prototype star AM Her.
Qishan Wang, Xiaohui Fang, Shengbang Qian   +2 more
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

TESS Photometry of AM Her and AR UMa: Binary Parameters, Cyclotron Emission Modeling, and Mass Transfer Duty Cycles

The Astrophysical Journal
Transiting Exoplanet Survey Satellite (TESS) photometry of the polars AM Herculis (AM Her) and AR Ursae Majoris (AR UMa) is presented, along with high-speed photometry. AM Her shows a variety of high states with frequent transitions between them.
Paul A. Mason, Pasi Hakala, Kinwah Wu, Paul E. Barrett, Krystian Iłkiewicz, Colin Littlefield, Lorena C. Monroy, Hasan C. Sezer, Francisco Jablonski, Peter Garnavich, Paula Szkody, Gavin Ramsay, Christopher Duffy, Simone Scaringi   +13 more
doaj   +1 more source

Idling Magnetic White Dwarf in the Synchronizing Polar BY Cam. The Noah-2 Project

, 2008
Results of a multi-color study of the variability of the magnetic cataclysmic variable BY Cam are presented. The observations were obtained at the Korean 1.8m and Ukrainian 2.6m, 1.2m and 38-cm telescopes in 2003-2005, 56 observational runs cover 189 ...
A. Bianchini, A.A. Henden, A.D. Silber, A.J. Norton, A.R. King, B. Warner, C. Hellier, E.P. Pavlenko, E.P. Pavlenko, E.P. Pavlenko, E.T. Whittaker, G.A. Wynn, H. Ritter, H.R. Richman, H.S. Stockman, I.L. Andronov, I.L. Andronov, I.L. Andronov, I.L. Andronov, I.L. Andronov, I.L. Andronov, I.L. Andronov, I.L. Andronov, I.L. Andronov, I.L. Andronov, I.L. Andronov, I.L. Andronov, J. Patterson, J. Tremko, M. Cropper, M. Livio, M.M. Basko, P. Szkody, P.A. Mason, P.A. Mason, P.A. Mason, P.A. Mason, R. Hudec, R. Schwarz, R.A. Remillard, R.D. Geckeler, R.K. Honeycutt, S. Kafka, T. Neckel, T.A. Somova, V.V. Breus, W. Forman, Y.G. Kim, Y.G. Kim, Y.G. Kim   +49 more
core   +1 more source

Masses, Luminosities, and Orbital Coplanarities of the mu Orionis Quadruple Star System from PHASES Differential Astrometry [PDF]

, 2007
mu Orionis was identified by spectroscopic studies as a quadruple star system. Seventeen high precision differential astrometry measurements of mu Ori have been collected by the Palomar High-precision Astrometric Search for Exoplanet Systems (PHASES ...
Aitken R. G., Benjamin F. Lane, Bernard F. Burke, Duquennoy A., Fekel F. C., Francis C. Fekel, Horch E., Horch E. P., Hummel C. A., Lane B. F. & Colavita M. M., M. M. Colavita, M. Shao, Maciej Konacki, Matthew W. Muterspaugh, Muterspaugh M. W., Perryman M. A. C., S. R. Kulkarni, Skrutskie M. F., Sloane J. Wiktorowicz, Smith R. C., Söderhjelm S.   +20 more
core   +1 more source

Spectroscopic Identification and Population Properties of Cataclysmic Variables from DESI DR1

The Astrophysical Journal Supplement Series
We present a systematic search for cataclysmic variables (CVs) using spectroscopic data from Data Release 1 of the Dark Energy Spectroscopic Instrument. Applying the Bagging-TopPush algorithm, we identified 433 CV candidates and related objects, of which
Wen Hou, Jia-Mao Lin, A-Li Luo, Zhi-Bin Dai, Yi-Qiao Dong, Shu-Guo Ma   +5 more
doaj   +1 more source

Discovery of a Magnetic White Dwarf in the Symbiotic Binary Z Andromedae [PDF]

, 1998
We report the first result from our survey of rapid variability in symbiotic binaries: the discovery of a persistent oscillation at P=1682.6 +- 0.6 s in the optical emission from the prototype symbiotic, Z Andromedae.
Duschl W. J., Duschl W. J., Formiggini L., J. L. Sokoloski, Lars Bildsten, Meyer-Hofmeister E., Mikolajewska J., Mikolajewski M., Mikolajewski M., Murset U., Robinson K., Schmid H. M., Tomov T.   +12 more
core   +2 more sources

THE AGE AND MASS OF THE α HERCULIS TRIPLE-STAR SYSTEM FROM A MESA GRID OF ROTATING STARS WITH 1.3 ⩽ M/M☉ ⩽ 8.0 [PDF]

, 2013
α1 Her is the second closest asymptotic giant branch (AGB) star to the Sun, and the variable luminous M5 Ib-II member of a triple-stellar system containing G8 III and A9 IV-V components.
E. Moravveji, E. Guinan, H. Khosroshahi, R. Wasatonic   +3 more
semanticscholar   +1 more source

NuSTAR Broadband X-Ray Observation of EF Eri Following its Reawakening into a High Accretion State

The Astrophysical Journal
We present the first NuSTAR X-ray observation of EF Eri, a well-known polar system. The NuSTAR observation was conducted in conjunction with NICER shortly after EF Eri entered a high accretion state following an unprecedented period of low activity ...
Luke W. Filor, Kaya Mori, Gabriel Bridges, Charles J. Hailey, David A. H. Buckley, Gavin Ramsay, Axel D. Schwope, Valery F. Suleimanov, Michael T. Wolff, Kent S. Wood   +9 more
doaj   +1 more source