Results 81 to 90 of about 753,723 (234)

A Low Metallicity Massive Contact Binary Star System Candidate in WLM Identified by Hubble and James Webb Space Telescope Imaging

The Astrophysical Journal
We present archival Hubble Space Telescope (HST) and JWST ultraviolet through near-infrared time series photometric observations of a massive minimal-contact binary candidate in the metal-poor galaxy Wolf–Lundmark–Melotte ( Z  = 0.14 Z _⊙ ).
Maude Gull, Daniel R. Weisz, Kareem El-Badry, Jan Henneco, Alessandro Savino, Meredith Durbin, Yumi Choi, Roger E. Cohen, Andrew A. Cole, Matteo Correnti, Julianne J. Dalcanton, Karoline M. Gilbert, Steven R. Goldman, Puragra Guhathakurta, Kristen B. W. McQuinn, Max J. B. Newman, Evan D. Skillman, Benjamin F. Williams   +17 more
doaj   +1 more source

Photometric Studies of the Contact Binary BV Draconis [PDF]

Journal of Astronomy and Space Sciences, 1999
We performed CCD photometric observations of W UMa type contact binary BV Dra during eight nights from May 1996 to June 1999 using 61cm telescope at Sobaeksan Optical Astronomy Observatory, and completed BVR light curves of the system.
Jae Woo Lee, Wonyong Han, Chun-Hwey Kim
doaj  

Evolution of the progenitor binary of V1309 Scorpii before merger

, 2011
It was recently demonstrated that the eruption of V1309 Sco was a result of a merger of the components of a cool contact binary. We computed a set of evolutionary models of the detached binaries with different initial parameters to compare it with pre ...
Demircan, Eggleton, Eggleton, Eggleton, Flannery, Gazeas, Girardi, Holzwarth, K. Stȩpień, Lednicka, Lucy, Lucy, Mason, Paczyński, Pizzolato, Rasio, Rutten, Schaller, Schmitt, Stȩpień, Stȩpień, Stȩpień, Torres, Tylenda, Tylenda, Tylenda, Webbink, Wood, Wood   +28 more
core   +1 more source

A Application of WD Model to EB Type Contact Binary System [PDF]

Journal of Astronomy and Space Sciences, 2000
The EB type contact binaries show large temperature difference ( T 1,000K) between two components. Thus we have modified the mode 3 of the WD program to adjust albedos, limb darkening coefficients and gravity darkening exponents for both components of ...
Su-Yeon Oh, Kyu-Dong Oh
doaj  

Photoelectric Observations and Analysis of the Contact Binary W UMa [PDF]

Journal of Astronomy and Space Sciences, 2001
The unpublished photoelectric observations of the contact binary W UMa in ultraviolet, blue, and yellow bandpasses made on four nights during the observing seasons from April, 1984 to May, 1985 were presented.
Chun-Hwey Kim, Chung Uk Lee, Young Woon Kang   +2 more
doaj  

Twin Binaries: Studies of Stability, Mass Transfer, and Coalescence

, 2011
Motivated by suggestions that binaries with almost equal-mass components ("twins") play an important role in the formation of double neutron stars and may be rather abundant among binaries, we study the stability of synchronized close and contact ...
Belczynski, Bethe, Chandrasekhar, Chandrasekhar, D'souza, Dan, Eggleton, F. A. Rasio, Habets, Hachisu, Hillwig, Hillwig, Hut, J. C. Lombardi, Jacoby, K. Gearity, K. L. Dooley, Krumholz, Lee, Motl, Nice, Paczyiński, Pinsonneault, Pols, Rasio, Rasio, Santander-Garcia, Stairs, Thorsett, V. Kalogera, W. Holtzman, Wang, Webbink, Weisberg, Willems, Willems, Wong   +36 more
core   +1 more source

Binary Analysis and Period Study of the Long-period, High-mass-ratio Contact Binary KIC 7766185

The Astronomical Journal
We present an in-depth photometric and spectroscopic study of the contact binary KIC 7766185. Spectroscopic observations were conducted on the Mayall 4 m telescope at Kitt Peak National Observatory and used to extract radial velocities.
Conor M. Larsen, Andrej Prša
doaj   +1 more source

CCD photometric study of the W UMa-type binary II CMa in the field of Berkeley 33

, 2011
The CCD photometric data of the EW-type binary, II CMa, which is a contact star in the field of the middle-aged open cluster Berkeley 33, are presented. The complete R light curve was obtained.
Jia, Zhao, Jiajia, He, Jinzhao, Yuan, Liang, Liu, Liying, Zhu, Shengbang, Qian, Wenping, Liao, Zhibin, Dai   +7 more
core   +1 more source

The Photometric Investigation of V921 Her using the Lunar-based Ultraviolet Telescope of Chang'e-3 mission

, 2016
The light curve of V921 Her in ultraviolet band observed by the Lunar-based Ultraviolet Telescope (LUT) is analyzed by the Wilson-Devinney code. Our solutions conclude that V921 Her is an early type marginal contact binary system with an additional close-
Li, Lin-Jia, Qian, Sheng-Bang, Wang, Qi-Shan, Zhang, Jia, Zhou, Xiao   +4 more
core   +2 more sources

EVIDENCE ON HOT SPOT IN CONTACT BINARY VW CEPHEI

Odessa Astronomical Publications, 2017
We study the nature of asymmetry and the intrinsic variability in the light curves of VW Cep. We analyze our own B,V light curves as well as the other data from literary sources. In view of the presence of significant intrinsic brightness variations at a
I. B. Pustylnik, P. G. Niarchos
doaj   +1 more source