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Quasiperiodic oscillations in the light curve of GRB 080319B
Dranevich, V. A.; Dmitriyev, P. B.; Gnedin, Yu. N.
A modified spectral analysis technique is used to study the temporal structure of the emission from the γ-ray burst GRB 080319B detected in three space missions, Swift/BAT, Wind/KONUS, and Integral/SPI ACS. The energy range of the γ rays detected in these experiments covers 15-10000 keV. The time resolution for the first two of these experiments w…
Determining the fundamental parameters of F and G supergiants
Lyubimkov, L. S.; Rachkovskaya, T. M.; Poklad, D. B.
A technique for determining the effective temperature Teff and the acceleration of gravity log g of F and G supergiants is discussed using four bright stars as examples, specifically two F supergiants, α Lep(F0 Ib) and π Sgr (F2 II), and two G supergiants, β Aqr (G0 Ib) and α Aqr (G2 Ib). In all four cases the parameter log g was derive…
Physical parameters of the semiregular variable red giant 2 Cen
Arkharov, A. A.; Ruban, E. V.; Hagen-Thorn, E. I. +1 more
This is a study of photometric data from the Hipparcos catalog and spectrophotometric observations by a group of Pulkovo observers in Bolivia of the variable star 2 Cen (V806 Cen). Fourier analysis yields a more precise value of 12.57 d for the period of the brightness variation instead of 12.0 d. Light curves constructed from the photometric data…
Observational evidences of multiple shock waves in X-ray selected BL Lacerate objects
Kapanadze, B. Z.
The results of optical R-band photometry of three X-ray selected BL Lacertae objects 1ES 0502+675, 1ES 0806+524 and 1ES 1959+650 from the Einstein Slew Survey are presented. The observations are performed during 1997–2006 with the 70-cm meniscus type telescope of Abastumani Astrophysical Observatory. The objects show clear long-term variability wi…