Αποτελέσματα 1-10 από 12
Orbital Period Changes and Global Evolution of Contact Binaries
(Kluwer Academic Publishers, 2000)
Numerical models has shown that thermal or dynamical processes drive the close binary evolution faster than the classic chemical evolution of their interiors. (e.g. Iben & Tutukov, 1984;Sarna & Federova, 1989;van’t Veer & ...
New Light Elements of the RS CVn-Type Binary RT Andromedae
In the present study the (O-C) diagram of the eclipsing binary RT Andromedae was constructed, using all minima times found in the literature. It can be described very well by a third or a fourth order polynomial, but a ...
A Period Analysis of V505 Sagittarri
The variable star V505 Sgr (HR 7571, HD 187949) was discovered to be an eclipsing binary by Hoffmeister (1934). Its first photoelectric light curves were obtained by Oosterhoff in 1950 and were analysed by Kwee (1953) ...
Observed Properties of Contact Binary Systems
(S. M. Andrievsky, 2001-12)
A group of close eclipsing systems, which continues to pose a challenge in many subjects of modern astrophysics, is that of contact binaries. In this study, using the most recent observational data of a large sample of ...
Investigating the fracture non-linear dynamics through multi-spectral time series analysis of fracture-induced electromagnetic emissions
(EGU General Assembly, 2013)
Electromagnetic (EM) emissions (EME) in a wide frequency spectrum ranging from kHz to MHz are produced by cracks’ opening, considered as fracture precursors. Thus, their study constitutes a nondestructive method for ...
Photoelectric Minima Times of GK Cephei and variations in its period
The eclipsing binary star GK Cep (BV 382, BD+70d 1183, HD 205372, SAO 10069) has been observed photoelectrically during 1987 and 1988 from the National Observatory of Athens, Greece. The observations were made with a ...