Results 51 to 60 of about 1,271 (117)

Multi-epoch Doppler tomography and polarimetry of QQ Vul [PDF]

, 1999
We present multi-epoch high-resolution spectroscopy and photoelectric polarimetry of the long-period polar (AM Herculis star) QQ Vul. The blue emission lines show several distinct components, the sharpest of which can unequivocally be assigned to the ...
A. D. Schwope, A. Metzner, Beardmore A. P., Beuermann K., Catalan M. S., Catalan M. S., Cropper M., Cropper M., D. Steeghs, K. Beuermann, M. S. Catalan, Meggitt S. M. A., Mukai K., Mukai K., Mukai K., Osborne J. P., R. C. Smith, Schwope A. D., Schwope A. D., Schwope A. D., Sohl K., Stahl O.   +21 more
core   +3 more sources

XMM-Newton observation of the long-period polar V1309 Ori: The case for pure blobby accretion

, 2005
Using XMM-Newton we have obtained the first X-ray observation covering a complete orbit of the longest period polar, V1309 Ori. The X-ray light curve is dominated by a short, bright phase interval with EPIC pn count rates reaching up to 15 cts/sec per 30
Aizu, Araujo-Betancor, Beuermann, Beuermann, Beuermann, Beuermann, Buckley, Burwitz, Clayton, Cropper, de Martino, Done, Frank, Frank, Gänsicke, Hameury, Hameury, Heise, Heise, K. Beuermann, K. Reinsch, Katajainen, King, Kuijpers, Lamb, Litchfield, Mewe, Patterson, R. Schwarz, Ramsay, Ramsay, Rothschild, Schmidt, Schmidt, Schwope, Shafter, Staude, Stella, Townsley, V. Burwitz, Walter, Watson, Woelk   +42 more
core   +1 more source

Multivariate characterization of hydrogen Balmer emission in cataclysmic variables [PDF]

, 2006
The ratios of hydrogen Balmer emission line intensities in cataclysmic variables are signatures of the physical processes that produce them. To quantify those signatures relative to classifications of cataclysmic variable types, we applied the ...
Adam, Cropper, Duerbeck, Gordon E. Sarty, Kinwah Wu, Shakura, Shaviv, Wu   +7 more
core   +4 more sources

Cyclotron spectroscopy of VV Puppis [PDF]

, 1997
We present phase-resolved spectrophotometric observations of VV Puppis obtained during two different states of accretion. We confirm the detection of cyclotron lines from emission regions at both poles (Wickramasinghe et al.
Bailey, Bailey, Barrett, Brainerd, Burwitz, Canalle, Chanmugam, Cropper, Cropper, Frank, Larsson, Liebert, Liebert, Osborne, Piirola, Schwope, Schwope, Schwope, Stockman, Szkody, Tapia, Visvanathan, Walker, Warner, Wickramasinghe, Wickramasinghe, Wickramasinghe, Wickramasinghe, Wickramasinghe, Woelk   +29 more
core   +2 more sources

Detailed ROSAT X-ray Analysis of the AM Her Cataclysmic Variable VV Pup

, 2014
VV Pup is typical system of AM Her stars, where the main accreting pole rotates in and out of view during the orbital cycle. In the present paper we present ROSAT data analysis for the magnetic cataclysmic variable VV Pup.
Kholy, E. El, Nouh, M. I.
core   +1 more source

Magnetic Cataclysmic Variable Accretion Flows [PDF]

, 2007
We have used a magnetic accretion model to investigate the accretion flows of magnetic cataclysmic variables (mCVs) throughout a range of parameter space.
Butters, O. W., Norton, A. J., Parker, T. L., Wynn, G. A.   +3 more
core   +1 more source

The Double Contact Nature of TT Herculis

, 2014
We present new radial velocities and photometry of the short-period Algol TT Herculis. Previous attempts to model the light curves of the system have met with limited success, primarily because of the lack of a reliable mass ratio.
Nelson, Robert H., Terrell, Dirk
core   +1 more source

Secondary stars in CVs - the observational picture [PDF]

, 1999
Recent theoretical and observational progress has substantially improved the definition of the lower main sequence and established a new basis for a comparison of main sequence stars and the secondaries in CVs.
Beuermann, K.
core   +2 more sources

Optical vortices with starlight: Implications for ground-based stellar coronagraphy

, 2008
Using an l = 1 blazed fork-hologram at the focal plane of the Asiago 122 cm telescope, we obtained optical vortices from the stellar system Rasalgethi (alpha Herculis) and from the single star Arcturus (alpha Bootis).
A. Bianchini, Allen, Barbieri, Bazhenov, Beijersbergen, Bekshaev, C. Barbieri, Clifford, Coullet, F. Tamburini, Fried, G. Anzolin, G. Umbriaco, Grier, Halbwachs, Harwit, Jenkins, King, Law, Law, Leach, Mawet, McAlister, Molina-Terriza, Nye, Oemrawsingh, Padgett, Shvedov, Swartzlander, Swartzlander, Swartzlander, Swartzlander, Tamburini, Vaziri   +33 more
core   +1 more source

Mergers and Obliquities in Stellar Triples

, 2014
Many close stellar binaries are accompanied by a far-away star. The "eccentric Kozai-Lidov" (EKL) mechanism can cause dramatic inclination and eccentricity fluctuations, resulting in tidal tightening of inner binaries of triple stars.
Fabrycky, Daniel C., Naoz, Smadar
core   +2 more sources