Results 31 to 40 of about 806,657 (286)

Contact Binary Stars [PDF]

International Astronomical Union Colloquium, 1983
Abstract:Ultraviolet and X-ray surveys of the W Ursae Majoris type stars are reviewed. These systems exhibit extended coronas and transition regions that are confined close to the optically determined surfaces. Correlations of X-ray activity with period or rotational velocity indicate a turn-over or saturation of emission at the short periods or high ...
openaire   +1 more source

A ROSAT Survey of Contact Binary Stars

, 2005
Contact binary stars are common variable stars which are all believed to emit relatively large fluxes of x-rays. In this work we combine a large new sample of contact binary stars derived from the ROTSE-I telescope with x-ray data from the ROSAT All-Sky ...
Hunsch M., M. T. Geske, McGale P. A., S. J. Gettel, T. A. McKay, Voges W.   +5 more
core   +1 more source

The Very Short Period M Dwarf Binary SDSS J001641-000925 [PDF]

, 2012
We present follow-up observations and analysis of the recently discovered short period low-mass eclipsing binary, SDSS J001641-000925. With an orbital period of 0.19856 days, this system has one of the shortest known periods for an M dwarf binary system.
Andrew A. West, Andrew C. Becker, Baraffe, Bayless, Becker, Bochanski, Bochanski, Bochanski, Bochanski, Bonanos, Bradstreet, Covey, Davenport, Eric J. Hilton, Ferah A. Munshi, Ford, Foreman-Mackey, Friedman, Frieman, Grundstrom, Heather C. Gunning, Hilton, Holtzman, Ivezić, James R. A. Davenport, Jiang, John J. Bochanski, Jon Holtzman, Kopal, Kowalski, Kruse, Kubiak, Lada, López-Morales, Meagan Albright, Morales, Morgan, Prša, Prša, Reid, Reimann, Rucinski, Rucinski, Rucinski, Rucinski, Sesar, Silvestri, Stepien, Stepien, Suzanne L. Hawley, Udalski, Vanden Berk, West, West, Wilson, York   +55 more
core   +3 more sources

Light Curves and Roche Configurations of Near-Contact Binary AX Draconis [PDF]

Journal of Astronomy and Space Sciences, 2003
We completed the light curves of near-contact binary system AX Dra for 11 nights from March 2001 to May using the 61-cm reflector and VR filters at Sobaeksan Optical Astronomy Observatory.
Ho-Il Kim, Jae Woo Lee, Chun-Hwey Kim, Jae-Hyuk Yoon, Woo-Baik Lee   +4 more
doaj   +1 more source

Detection of Contact Binaries Using Sparse High Phase Angle Lightcurves

, 2007
We show that candidate contact binary asteroids can be efficiently identified from sparsely sampled photometry taken at phase angles >60deg. At high phase angle, close/contact binary systems produce distinctive lightcurves that spend most of the time at ...
Leone G., Margot J. L., Merline W. J., Nolan M. C., Pedro Lacerda, Zappala V.   +5 more
core   +1 more source

Study of Shear Behavior of Binary Mixtures by DEM Simulation of Biaxial Test in the Membrane Boundary Condition

Frontiers in Physics, 2021
This paper aims to study the shear behavior of binary particles with irregular shapes by discrete element method simulations of the biaxial test in the membrane boundary condition.
Kai Wu, Weichen Sun, Jianwen Ding, Xiang Zhang, Songyu Liu   +4 more
doaj   +1 more source

On the properties of contact binary stars

, 2004
A catalogue of light curve solutions of contact binary stars has been compiled. It contains the results of 159 light curve solutions. Properties of contact binary stars were studied by using the catalogue data. As it is well known since Lucy's (1968a,b)
Binnendijk, Bradstreet, Flower, Kalimeris, Kuiper, Kähler, Kähler, Kähler, Kähler, Kähler, Liu, Lucy, Lucy, Lucy, Maceroni, Maceroni, Mochnacki, P. Klagyivik, Pribulla, Rucinski, Sz. Csizmadia, Vinkó, Webbink   +22 more
core   +1 more source

The Frequency of Binary Stars in the Core of 47 Tucanae

, 2001
Differential time series photometry has been derived for 46422 main-sequence stars in the core of 47 Tucanae. The observations consisted of near-continuous 160-s exposures alternating between the F555W and F814W filters for 8.3 days in 1999 July with ...
Alard C., Ata Sarajedini, Bacon D., Belloni T., Bertelli G., Bopp B. W., Callanan P. J., Cutispoto G., Davies M. B., Duquennoy A., Elson R. A. W., Heggie D. C., Heggie D. C., Kaluzny J., Kaluzny J., Kaluzny J., Keppens R., Keppens R., Mathieu R. D., Menzies J. W., Meylan G., Michael D. Albrow, Peter D. Edmonds, Portegies Zwart S. F., Puragra Guhathakurta, Rahunen T., Robertson J. A., Ronald L. Gilliland, Timothy M. Brown, van den Berg M., Vilhu O., Yan L.   +31 more
core   +1 more source

A multiwavelength investigation of the massive eclipsing binary Cyg OB2 #5 [PDF]

, 2008
The properties of the early-type binary Cyg OB2 #5 have been debated for many years and spectroscopic and photometric investigations yielded conflicting results.
Abbott, Antokhina, Benaglia, Bohannan, Bohlin, Cardelli, Contreras, Corcoran, De Becker, De Becker, De Becker, Demers, Dessart, Eaton, G. Rauw, Hall, Harnden, Harries, Herbig, Hübscher, Ignace, J. Manfroid, J.-M. Vreux, Khaliullin, Kiminki, Kitamoto, Leung, Lucy, M. De Becker, Manfroid, Massey, Massey, Mewe, Miczaika, Miralles, N. Linder, Nazé, Nazé, Osaki, P. Eenens, P. Royer, Rauw, Rauw, Reed, Royer, Sana, Sana, Singh, Stetson, Stevens, Strüder, Tassoul, Torres-Dodgen, Turner, Vreux, Waldron, Wegner, Wilson, Y. Damerdji   +58 more
core   +1 more source

The Binary Contact Path Process

The Annals of Probability, 1983
We study some $\{0, 1, \cdots\}^{z^d}$ valued Markov interactions $\eta_t$ called contact path processes. These are similar to branching random walks, in that the normalized size process starting from a singleton is a martingale which converges to a limit $M_\infty$.
openaire   +2 more sources