Results 61 to 70 of about 34,923 (243)

Discovery of a bright eclipsing cataclysmic variable [PDF]

, 2007
We report on the discovery of J0644+3344, a bright deeply eclipsing cataclysmic variable (CV) binary. Spectral signatures of both binary components and an accretion disk can be seen at optical wavelengths.
Augusteijn, Clarke, D. K. Sing, Dhillon, E. M. Green, G. D. Schmidt, Hoard, J. B. Holberg, J. S. Shaw, Knigge, Landolt, M. Lopez-Morales, Marsh, Mason, Mason, Massey, S. B. Howell, Schmidt, Schwarzenberg-Czerny, Walker, Williams, Zacharias   +21 more
core   +2 more sources

The Periods of Cataclysmic Variable Stars [PDF]

International Astronomical Union Colloquium, 1983
To understand the structure and evolution of the cataclysmic variables, we will need accurate values for their masses, dimensions, mass transfer rates, and other physical properties. Unfortunately, despite an abundance of observational data on these systems, there is a severe dearth of reliable, quantitative information about their fundamental physical
openaire   +1 more source

Spectroscopy and orbital periods of four cataclysmic variable stars [PDF]

, 2001
We present spectroscopy and orbital periods Porb of four relatively little-studied cataclysmic variable stars. The stars and their periods are: AF Cam, Porb=0.324(1) d (the daily cycle count is slightly ambiguous); V2069 Cyg (= RX J2123.7+4217), 0.311683(
J. Thorstensen, C. Taylor
semanticscholar   +1 more source

Investigation of the new cataclysmic variable 1RXS J180834.7+101041

, 2012
We present the results of our photometric and spectroscopic studies of the new eclipsing cataclysmic variable star 1RXS J180834.7+101041. Its spectrum exhibits double-peaked hydrogen and helium emission lines.
A. D. Schwope, A. M. Fridman, A. W. Shafter, B. L. Afanasiev, B. Paczynski, B. Warner, C. Hellier, C. Hellier, C. Knigge, C. Papadaki, D. G. Yakin, D. Steeghs, D. Steeghs, D. V. Bisikalo, E. Romero-Colmenero, G. A. Chanan, H. M. Boffin, I. F. Bikmaev, J. Bailey, J. K. Cannizzo, J. Patterson, J. Wood, K. Horne, M. F. Walker, M. R. Schreiber, N. I. Shakura, N. V. Borisov, P. P. Eggleton, P. Rodrigez-Gil, R. Baptista, R. C. Bohlin, R. K. Saito, R. Schwarz, S. B. Howell, V. F. Suleimanov, V. F. Suleimanov, V. L. Afanasiev, V. V. Neustroev, V. V. Neustroev, V. V. Shimanskii, V. V. Shimanskii, V. V. Shimanskii   +41 more
core   +1 more source

K-band spectroscopy of pre-cataclysmic variables [PDF]

, 2007
Aims. There exists now substantial evidence for abundance anomalies in a number of cataclysmic variables (CVs), indicating that the photosphere of the secondary star incorporates thermonuclear processed material. However, the spectral energy distribution
Ali, B. T. Gänsicke, Beuermann, Bonfils, Bragaglia, Bruch, Bruch, C. Tappert, Carpenter, Cushing, Downes, F. P. Navarrete, Förster Schreiber, Gänsicke, Haefner, Haefner, Harrison, Harrison, Harrison, Hoard, Hoard, Ivanov, Kawka, Kawka, Kilkenny, Kirkpatrick, Kleinmann, L. Schmidtobreick, Leggett, Liebert, Marks, Maxted, Morales-Rueda, O'Donoghue, Oliver, Patterson, Pols, R. E. Mennickent, Ritter, Rodgers, Rousselot, Saffer, Schenker, Schreiber, Silvestri, Stocke, Tappert, Thorstensen   +47 more
core   +2 more sources

White Dwarfs in Cataclysmic Variable Stars: Surface Temperatures and Evolution [PDF]

Journal of Astronomy and Space Sciences, 2012
A summary is presented of what is currently known about the surface temperatures of accreting white dwarfs (WDs) detected in non-magnetic and magnetic cataclysmic variables (CVs) based upon synthetic spectral analyses of far ultraviolet data.
Edward M. Sion
doaj   +1 more source

On the orbital period of the cataclysmic variable RZ Leonis [PDF]

, 2001
In this research note we present a time-resolved study of the Balmer emission lines of RZ Leo. From the analysis of the radial velocities we find an orbital period of 0.07651(26) d.
C. Tappert ., , Mennickent, Patterson, R. E. Mennickent, Scargle, Schwarzenberg-Czerny, Szkody   +6 more
core   +2 more sources

The ethics of responding to democratic backsliding abroad

American Journal of Political Science, EarlyView.
Abstract The past decade has seen a marked shift as many previously liberal democratic states have backslidden, taking authoritarian turns. How should liberal actors respond to democratic backsliding by others? Although it might seem that it is vital for liberal actors to react robustly to avoid complicity or to maintain their liberal integrity, this ...
James Pattison
wiley   +1 more source

The S-PLUS 12-band Photometry as a Powerful Tool for Discovery and Classification: Ten Cataclysmic Variables in a Proof-of-concept Study

The Astrophysical Journal Letters
Multiband photometric surveys provide a straightforward way to discover and classify astrophysical objects systematically, enabling the study of a large number of targets at relatively low cost.
Raimundo Lopes de Oliveira, Amanda S. de Araújo, Angela C. Krabbe, Claudia L. Mendes de Oliveira, Koji Mukai, Luis A. Gutiérrez-Soto, Antonio Kanaan, Romualdo Eleutério, Marcelo Borges Fernandes, Fredi Quispe-Huaynasi, William Schoenell, Tiago Ribeiro   +11 more
doaj   +1 more source

Theoretical Light-curve Models of the Symbiotic Nova CN Cha—Optical Flat Peak for 3 Yr

The Astrophysical Journal, 2023
CN Cha is a slow symbiotic nova characterized by a 3 yr long optical flat peak followed by a rapid decline. We present theoretical light curves for CN Cha, based on hydrostatic approximation, and estimate the white-dwarf (WD) mass to be ∼0.6 M _☉ for a ...
Mariko Kato, Izumi Hachisu
doaj   +1 more source