Results 41 to 50 of about 126,759 (296)

1318 New Variable Stars in a 0.25 Square Degree Region of the Galactic Plane [PDF]

, 2010
We have conducted a deep photometric survey of a 0.5 deg x 0.5 deg area of the Galactic Plane using the WFI instrument on the 2.2-m ESO telescope on La Silla, Chile. The dataset comprises a total of 267 R-band images, 204 from a 16 day observation run in
Alard, Albrecht, Albrow, Albrow, Albrow, Bayne, Bessell, Bonnarel, Bramich, C. Afonso, Cargile, Carpenter, Christiansen, Covino, Davidge, Hebb, Irwin, Lomb, M. D. Albrow, Monet, O'Connell, Ochsenbein, Pojmanski, Rucinski, Rucinski, Rucinski, Skrutskie, Soszynski, Soszynski, Soszynski, Stassun, Stassun, Stellingwerf, Stetson, Th. Henning, V. R. Miller, Weldrake, Weldrake, Wozniak, Wyrzykowski   +39 more
core   +2 more sources

X-Ray and UV Observations of the Contact Binary KIC 9832227

The Astronomical Journal, 2023
We investigate the X-ray and UV emission from the contact binary star KIC 9832227, which was observed with XMM-Newton for one orbital cycle. The binary is detected with an average X-ray luminosity of 3.4 × 10 ^30 erg s ^−1 .
Dirk Pandel, Lawrence A. Molnar
doaj   +1 more source

Space-Based Photometry of Binary Stars: From Voyager to TESS

Universe, 2021
Binary stars are crucial laboratories for stellar physics, so have been photometric targets for space missions beginning with the very first orbiting telescope (OAO-2) launched in 1968.
John Southworth
doaj   +1 more source

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

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

Dynamical evolution of active detached binaries on log Jo - log M diagram and contact binary formation [PDF]

, 2006
Orbital angular momentum (Jo), systemic mass (M) and orbital period (P) distributions of chromospherically active binaries (CAB) and W Ursae Majoris (W UMa) systems were investigated.
Awadalla, Bilir, Binnendijk, Claret, Demircan, Demircan, Eggen, Eggen, Eggen, Eggen, Eggleton, Gazeas, Ghez, Guinan, Huang, Karataş, Kiseleva, Kraft, Maceroni, Maceroni, Mestel, Mestel, Mochnacki, Montes, Montes, O. Demircan, Okamoto, Paczynski, Pooley, Pribulla, Pringle, Qian, Rasio, Rucinski, Rucinski, Rucinski, S. Bilir, Schatzman, Stepien, Van't Veer, Vilhu, Wilson, Y. Karataş, Yakut, Z. Eker   +44 more
core   +2 more sources

Fundamental Parameters for Totally Eclipsing Contact Binaries Observed by TESS

The Astrophysical Journal
Totally eclipsing contact binaries provide a unique opportunity to accurately determine mass ratios through photometric methods alone, eliminating the need for spectroscopic data.
Xu Ding, KaiFan Ji, ZhiMing Song, XueFen Tian, JinLiang Wang, ChuanJun Wang, QiYuan Cheng, JianPing Xiong   +7 more
doaj   +1 more source

Low Mass Ratio Contact Binary Systems HN UMa and II UMa - III [PDF]

Journal of Astronomy and Space Sciences, 2006
We present newly observed BVRI CCD light curves for low mass ratio contact binaries, HN UMa and II UMa. The absolute dimensions of these objects were obtained by applying the Wilson-Devinney program to previously published spectroscopic analysis and to ...
Woo-Baik Lee, Ho-il Kim, Young Woon Kang, Kyu-Dong Oh   +3 more
doaj   +1 more source

Hydrodynamics of Coalescing Binary Neutron Stars: Ellipsoidal Treatment

, 1994
We employ an approximate treatment of dissipative hydrodynamics in three dimensions to study the coalescence of binary neutron stars driven by the emission of gravitational waves.
Lai, Dong, Shapiro, Stu
core   +1 more source

First Light Curve Analysis of NSVS 8294044, V1023 Her, and V1397 Her Contact Binary Systems [PDF]

Research in Astronomy and Astrophysics
The first photometric light curve investigation of the NSVS 8294044, V1023 Her, and V1397 Her binary systems is presented. We used ground-based observations for the NSVS 8294044 system and Transiting Exoplanet Survey Satellite data for V1023 Her and ...
A. Poro, S. Baudart, Mahshid Nourmohammad, Zahra Sabaghpour Arani, Fatemeh Farhadi, S. Ranjbar Salehian, Ahmad Sarostad, Saeideh Ranjbaryan Iri Olya, Maryam Hadizadeh, AmirHossein Khodaei   +9 more
semanticscholar   +1 more source