Results 41 to 50 of about 1,271 (117)

The True Incidence of Magnetism among Field White Dwarfs [PDF]

, 2002
We study the incidence of magnetism in white dwarfs from three large and well-observed samples of hot, cool, and nearby white dwarfs in order to test whether the fraction of magnetic degenerates is biased, and whether it varies with effective temperature,
Dreizler S., J. B. Holberg, James Liebert, Liebert J., Marsh M. C., P. Bergeron, Reimers D., Wickramasinghe D. T.   +7 more
core   +4 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

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

Optical and X-ray Studies of Ten X-ray Selected Cataclysmic Binaries [PDF]

, 2013
We report on ground-based optical observations of ten cataclysmic binaries that were discovered through their X-ray emission. Time-resolved radial velocity spectroscopy yields unambiguous orbital periods for eight objects and ambiguous results for the ...
Halpern, Jules, Thorstensen, John R.
core   +3 more sources

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

Accurate masses and radii of normal stars: modern results and applications [PDF]

, 2009
This paper presents and discusses a critical compilation of accurate, fundamental determinations of stellar masses and radii. We have identified 95 detached binary systems containing 190 stars (94 eclipsing systems, and alpha Centauri) that satisfy our ...
A Claret, A Claret, A Claret, A Claret, A Claret, A Claret, A Claret, A Dariush, A Giménez, A Giménez, A Siviero, A. Giménez, AA Wachmann, AC Landtsheer de, AF Boden, AF Boden, AF Boden, AP Linnell, B Edvardsson, B Grønbech, B Nordström, B Nordström, B Smith, B Willems, CA Hummel, CA Hummel, CH Lacy, CH Lacy, CH Lacy, CH Lacy, CH Lacy, CH Lacy, CHS Lacy, CHS Lacy, CHS Lacy, CHS Lacy, CHS Lacy, CHS Lacy, CHS Lacy, CHS Lacy, CHS Lacy, CHS Lacy, CHS Lacy, CHS Lacy, D Pourbaix, D Ségransan, DA VandenBerg, DA VandenBerg, DE Holmgren, DE Holmgren, DH Berger, DJ Mullan, DJ Stickland, DK Bedford, DM Popper, DM Popper, DM Popper, DM Popper, DM Popper, DM Popper, DM Popper, DM Popper, DM Popper, DM Popper, DM Popper, DM Popper, DM Popper, DM Popper, DT Hoxie, DW Latham, E Lastennet, EL Martín, EM Standish, F D’Antona, F Grundahl, FC Fekel, FC Fekel, G Chabrier, G Pietrzyński, G Torres, G Torres, G Torres, G Torres, G Torres, G Torres, G Torres, G Torres, G Torres, G Torres, G Torres, G Torres, G. Torres, GF Benedict, GF Benedict, GF Porto de Mello, GW Henry, H Hensberge, HE Jørgensen, I Ribas, I Ribas, J Andersen, J Andersen, J Andersen, J Andersen, J Andersen, J Andersen, J Andersen, J Andersen, J Andersen, J Andersen, J Andersen, J Andersen, J Andersen, J Andersen, J Andersen, J Andersen, J Andersen, J Andersen, J Holmberg, J Southworth, J Southworth, J Southworth, J Southworth, J Tomkin, J Tremko, J. Andersen, JA Valenti, JC Morales, JC Morales, JF González, JR North, JR North, JV Clausen, JV Clausen, JV Clausen, JV Clausen, JV Clausen, JV Clausen, JV Clausen, JV Clausen, K Pavlovski, K Pavlovski, K Yakut, KG Stassun, KP Simon, L Girardi, L Tomasella, L Tomasella, LA Hillenbrand, LPR Vaz, LPR Vaz, LPR Vaz, LPR Vaz, LS Lyubimkov, M Haberreiter, M Imbert, M López-Morales, M López-Morales, M Wolf, M Wolf, M Wolf, M Wolf, M Zhao, MG Witte, MG Witte, MG Witte, MJ Barembaum, MW Muterspaugh, MW Muterspaugh, MW Muterspaugh, MY Bouzid, OR Pols, P Demarque, P Hadrava, P Hut, P Kervella, P Kumar, P Sestito, P Zasche, P Švaříček, PJ Flower, R Company, RE Wilson, RI Hynes, RM Williamon, RM Williamon, RS Tucker, S Albrecht, S Csizmadia, S Meibom, S Söderhjelm, S Yi, S Zucker, S Zucker, SA Bell, SHP Alencar, SJ Williams, SM Rucinski, T Forveille, T Mazeh, WG Bagnuolo Jr, WG Bagnuolo Jr, Y Debernardi, YY Balega   +203 more
core   +2 more sources

An Eccentric Planet Orbiting the Polar V808 Aurigae

The Astrophysical Journal
We analyze 15 yr of eclipse timings of the polar V808 Aur. The rapid ingress/egress of the white dwarf and bright accretion region provide timings as precise as a few tenths of a second for rapid cadence photometric data.
McKenna Leichty, Peter Garnavich, Colin Littlefield, Axel Schwope, Jan Kurpas, Paul A. Mason, Klaus Beuermann   +6 more
doaj   +1 more source

The Zeta Herculis binary system revisited. Calibration and seismology

, 2001
We have revisited the calibration of the visual binary system Zeta Herculis with the goal to give the seismological properties of the G0 IV sub-giant Zeta Her A. We have used the most recent physical and observational data.
Alexander, Alonso, Asplund, Baize, Berman, Berthomieu, Bessell, Bessell, Brown, Canuto, Canuto, Chmielewski, Comstock, F. Thévenin, Fabricius, Feierman, Fekel, Flower, G. Berthomieu, Gustafsson, Heintz, Henyey, Iglesias, J. Provost, Kjeldsen, Lastennet, Lewis, Lippincott, Magain, Martin, Morel, Morel, Morel, P. Morel, Rogers, Scarfe, Schaller, Schatzman, Söderhjelm, Thévenin, Thévenin, Turcotte   +41 more
core   +1 more source

The serendipituous discovery of a short-period eclipsing polar in 2XMMp [PDF]

, 2008
We report the serendipituous discovery of the new eclipsing polar 2XMMp J131223.4+173659. Its striking X-ray light curve attracted immediate interest when we were visually inspecting the source products of the 2XMMp catalogue.
A. Schwope, Beuermann, J. P. Osborne, J. Vogel, K. Byckling, Knigge, Leggett, M. G. Watson, McCarthy, Osborne, Pizzolato, R. Schwarz, Ramsay, Schmidt, Schwope, Schwope, Schwope, Sion, Szkody, Vogel, Watson   +20 more
core   +1 more source