Results 41 to 50 of about 4,939 (124)

Resolving the Periods of the Asynchronous Polar 1RXS J083842.1–282723

The Astrophysical Journal
1RXS J083842.1−282723 is a nearly synchronous magnetic cataclysmic variable with a simple X-ray light curve. While its orbital period was fairly well established at P _orb = 98.4 minutes from optical spectroscopy, indirect estimates of P _spin / P _orb ...
J. P. Halpern
doaj   +1 more source

Period doubling and Blazhko modulation in BL Herculis hydrodynamic models

, 2012
We present the hydrodynamic BL Herculis-type models which display a long-term modulation of pulsation amplitudes and phases. The modulation is either strictly periodic or it is quasi-periodic, with the modulation period and modulation pattern varying ...
Moskalik, P., Smolec, R.
core   +1 more source

XMM-Newton observations of EF Eridani: the textbook example of low-accretion rate polars [PDF]

, 2007
Archival X-ray observations of EF Eridani obtained in a low state revealed distinct X-ray detections at a luminosity L_X ~ 2 10^{29} erg/s, three orders of magnitude below its high state value. The plasma temperature was found to be as low as $kT \loa 2$
Koester, D., Schwope, A. D., Staude, A., Vogel, J.   +3 more
core   +2 more sources

Studies on the Habits and Distribution of Cryptocerus Texanus Santschi (Hymenoptera: Formicidae)

, 1954
Psyche: A Journal of Entomology, Volume 61, Issue 2, Page 41-57, 1954.
W. S. Creighton, R. E. Geegg
wiley   +1 more source

Spectroscopic Follow-up on Potential Magnetic Cataclysmic Variables

The Astronomical Journal
Spectroscopic observations of nine cataclysmic variables that have been postulated to contain magnetic white dwarfs were obtained to further characterize their classifications, orbital parameters, inclinations, and/or accretion properties.
Paula Szkody, Jan van Roestel, Paul A. Mason, Colin Littlefield, R. Michael Rich, Eric C. Bellm, Filipp D. Romanov, Brian F. Healy, Theophile Jegou du Laz, Russ R. Laher, Ben Rusholme   +10 more
doaj   +1 more source

1RXSJ062518.2+733433: A bright, soft intermediate polar

, 2003
We present the results of 50 hours time-resolved R-band photometry of the ROSAT all-sky survey source 1RXSJ062518.2+733433. The source was identified by Wei et al. (1999) as a cataclysmic variable.
Hambaryan, V., Krumpe, M., Schwarz, R., Schwope, A. D., Staude, A.   +4 more
core   +2 more sources

The AM Her System RX J1844.2+4454/2MASS J18441496+4454091/ZTF18aapobha

The Astrophysical Journal
Based on ROSAT All-Sky Survey data and optical follow-up observations, we report observations of the cataclysmic variable RX J1844.2+4454/2MASS J18441496+4454091/ZTF18aapobha.
J. Greiner, R. Schwarz, G. H. Tovmassian, M. Orio   +3 more
doaj   +1 more source

Superhumps in Cataclysmic Binaries. XXIII. V442 Ophiuchi and RX J1643.7+3402

, 2002
We report the results of long observing campaigns on two novalike variables: V442 Ophiuchi and RX J1643.7+3402. These stars have high-excitation spectra, complex line profiles signifying mass loss at particular orbital phases, and similar orbital periods
Berto Monard, Borisov G. V., Brian Martin, Casares J., Darragh O'Donoghue, David A. Harvey, David R. Skillman, de Jager O. C., Dickinson R. J., Edward Beshore, Frank J., Greg Bolt, Iping R. C., Jerry Foote, John R. Thorstensen, Joseph Patterson, Kraicheva Z., Kuijpers J., Lewis M. Cook, Matt Wood, Neil Butterworth, Osaki Y., Panos Niarchos, Pringle J. E., Robert Rea, Robert E. Fried, Smak J., Terquem C., Tonny Vanmunster, Uemura Y., Warner B., Whitehurst R., Wickramasinghe D. T., William H. Fenton, Woelk U.   +34 more
core   +1 more source

The secondary star and distance of the polar V1309 Ori [PDF]

, 2006
The first phase-resolved JHK light curves of the eclipsing polar (AM Herculis binary) V1309 Ori are presented and interpreted. We separate the contributions from the secondary star and from other sources with the aim of determining a photometric distance.
Bailey, Barnes, Beuermann, Beuermann, Beuermann, Beuermann, Beuermann, Buckley, Claret, Claret, Garnavich, Gänsicke, Harrop-Allin, K. Beuermann, K. Reinsch, Katajainen, King, O'Brien, Ramseyer, Schmidt, Schwarz, Shafter, Staude, Tokunaga, Walter, Wu, Y. Kim   +26 more
core   +2 more sources

Magnetic field and unstable accretion during AM Herculis low states [PDF]

, 2000
A study of AM Her low states in September 1990 and 1991 and June-July 1997 is reported from a coordinated campaign with observations obtained at the Haute-Provence observatory, at the 6-m telescope of the Special Astrophysical Observatory and at the 2.6m
Andronov, I. L., Bonnet-Bidaud, J. M., de Martino, D., Kolesnikov, S. V., Kraicheva, Z., Mouchet, M., Shakhovskoy, N. M., Somov, N. N., Somova, T. A.   +8 more
core   +2 more sources