Results 31 to 40 of about 84,499 (289)

Resonant Oscillations and Tidal Heating in Coalescing Binary Neutron Stars [PDF]

, 1994
Tidal interaction in a coalescing neutron star binary can resonantly excite the g-mode oscillations of the neutron star when the frequency of the tidal driving force equals the intrinsic g-mode frequencies.
Lai, Dong
core   +3 more sources

Eclipsing binaries in the MACHO database: New periods and classifications for 3031 systems in the Large Magellanic Cloud [PDF]

, 2007
Eclipsing binaries offer a unique opportunity to determine fundamental physical parameters of stars using the constraints on the geometry of the systems. Here we present a reanalysis of publicly available two-color observations of about 6800 stars in the
A. Derekas, Aubourg E., Giuricin G., Johnson A., L. L. Kiss, Lah P., Palen S., Pojmanski G., T. R. Bedding, Udalski A.   +9 more
core   +2 more sources

Contact binary stars

The Astrophysical Journal, 1981
Densities, corrected primary colors, minimum periods, inferred masses, luminosities, and specific angular momenta are computed from data on 37 W Ursae Majoris systems. A-type systems, having lower densities and angular momenta than the W-type systems, are shown to be evolved, and a new class of contact binary is identified, the OO Aquilae systems ...
openaire   +1 more source

Three Ultra-short-period Contact Eclipsing Binary Systems Mined from Massive Astronomical Surveys

The Astronomical Journal, 2023
We present the photometric analysis of three ultra-short-period total eclipsing binaries in contact configuration, CRTS_J172718.0+431624, OGLE-BLG-ECL-000104, and OGLE-BLG-ECL-000012, mined from massive astronomical surveys.
Athanasios Papageorgiou, Panagiota-Eleftheria Christopoulou, C. E. Ferreira Lopes, Eleni Lalounta, Márcio Catelan, Andrew J. Drake   +5 more
doaj   +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
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The near-contact binary star RZ Dra revisited

New Astronomy, 2011
Abstract This paper presents the absolute parameters of RZ Dra. New CCD observations were made at the Mt. Suhora Observatory in 2007. Two photometric data sets (1990 BV and 2007 BVRI) were analysed using modern light-curve synthesis methods. Large asymmetries in the light curves may be explained in terms of a dark starspot on the primary component ...
Erdem, A., Zoła, Stanisław, Winiarski, M.   +2 more
openaire   +3 more sources

Finding the most variable stars in the Orion Belt with the All Sky Automated Survey [PDF]

, 2010
We look for high-amplitude variable young stars in the open clusters and associations of the Orion Belt. We use public data from the ASAS-3 Photometric V-band Catalogue of the All Sky Automated Survey, infrared photometry from the 2MASS and IRAS ...
Acke, Alonso, Bailer-Jones, Balona, Bibo, Bonnarel, Bouvier, Braune, Briceño, Briceño, Briceño, Brown, Béjar, Caballero, Caballero, Caballero, Caballero, Caballero, Caballero, Caballero, Caballero, Caballero, Caballero, Caballero, Carpenter, Cieslinski, Cohen, Cohen, Collier Cameron, de Zeeuw, Downes, Downes, Ducourant, Eiroa, Eiroa, Epchtein, Fedorovich, Franciosini, Gettel, Glass, Gregorio-Hetem, Guetter, Hamilton, Hartmann, Herbig, Herbig, Herbst, Herbst, Hernández, Hernández, Hirth, Hoffmeister, Høg, Irwin, Jablonski, Jeffries, Jones, Joy, Jura, Kaiser, Kippenhahn, Koch, Kogure, Kovalchuk, Kraemer, Kurochkin, Kwok, Königl, Landstreet, Luyten, MacConnell, Maheswar, Marconi, Marconi, McKnelly, Miller Barr, Monet, Mora, Nakano, Nesterov, Nogami, Ogura, Oliveira, Osaki, Parihar, Patterson, Patterson, Pickering, Pickering, Pojmański, Pojmański, Richter, Ripepi, Robertson, Rosenbush, Röser, Scargle, Schirmer, Scholz, Scholz, Scholz, Sherry, Shu, Skrutskie, Sloan, Speck, Stassun, Stebbins, Stephenson, Sterken, Sterzik, Struve, Szkody, Templeton, Terrell, Thorstensen, Thé, Torres, Valenti, van den Ancker, van den Ancker, Vennes, Vieira, Voges, Vrba, Walborn, Walker, Walker, Warren, Weaver, Weintraub, Wiramihardja, Wolf, Wolf, Wouterloot, Yudin, Zapatero Osorio, Zapatero Osorio   +137 more
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Contact binary stars. I - an X-ray survey

The Astrophysical Journal, 1984
X-ray emission from a contact binary star was first detected by the HEAO 1 satellite in 1977. Spectroscopic observations of 44i Boo and VW Cep by IUE established the presence of high-temperature chromospheric and transition region emission lines in the spectra of these stars.
R. G. Cruddace, A. K. Dupree
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The light-curve intrinsic variability in 47 Kepler contact binary stars

Monthly Notices of the Royal Astronomical Society, 2022
ABSTRACT This work studies the significance of light-curve intrinsic variability in the numerical modelling of contact binaries. Using synthetic light curves, we show that the starspot-based intrinsic variability increases the apparent mass ratio by $\Delta q=5{{\ \rm per\ cent}}$.
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Can low metallicity binaries avoid merging?

, 2007
Rapid mass transfer in a binary system can drive the accreting star out of thermal equilibrium, causing it to expand. This can lead to a contact system, strong mass loss from the system and possibly merging of the two stars.
Cottaar, M., de Mink, S. E., Pols, O. R.
core   +1 more source