Search Publications

New Gamma-Ray Bursts Found in the Archival Data from the IBIS/ISGRI Telescope of the INTEGRAL Observatory

Minaev, P. Yu.; Pozanenko, A. S.; Grebenev, S. A. +1 more

A systematic search for cosmic gamma-ray bursts (GRBs) and other short hard X-ray events in the archival data from the IBIS/ISGRI telescope of the INTEGRAL observatory over 2003-2018 has been carried out. Seven previously unknown GRBs have been recorded in the telescope field of view; all of them have been localized with an accuracy ≤2 arcmin. The…

Search for Evolutionary Changes in the Periods of Cepheids: V1033 Cyg, a Classical Cepheid at the First Crossing of the Instability Strip

Lemasle, B.; Berdnikov, L. N.; Kniazev, A. Yu. +9 more

For the classical Cepheid V1033 Cyg we have constructed an O—C diagram spanning a time interval of 117 years. The O—C diagram has the shape of a parabola, which has made it possible to determine for the first time the quadratic light elements and to calculate the rate of evolutionary increase in the period dP/dt = 18.19 (±0.08) syr^-1, i…

Search for Evolutionary Changes in the Periods of Cepheids: BY Cas

Berdnikov, L. N.

For the low-amplitude Cepheid BY Cas we have constructed an O - C diagram spanning a time interval 123 years. The O - C diagram has the shape of a parabola, which has made it possible to determine for the first time the quadratic light elements and to calculate the rate of evolutionary increase in the period, dP/dt = +0.985 (±0.091) s yr^-1

Search for Evolutionary Changes in the Periods of Cepheids: V532 Cyg

Berdnikov, L. N.

For the low-amplitude Cepheid V532 Cyg we have constructed an O - C diagram spanning a time interval of 121 years. The O - C diagram has the shape of a parabola, which has made it possible to determine for the first time the quadratic light elements and to calculate the rate of evolutionary decrease in the period, dP/dt = -0.248 (±0.067) s yr^…

Investigation of the Outburst Activity of the Black Hole Candidate GRS 1739-278

Lutovinov, A. A.; Mereminskiy, I. A.; Filippova, E. V. +2 more

We have performed a joint spectral and timing analysis of the outburst of GRS 1739-278 in 2014 based on Swift and INTEGRAL data. We show that during this outburst the system exhibited both intermediate states: hard and soft. Peaks of quasi-periodic oscillations (QPOs) in the frequency range 0.1-5 Hz classified as type-C QPOs have been detected fro…

Search for Evolutionary Changes in the Periods of Cepheids: CF Cas

Berdnikov, L. N.; Pastukhova, E. N.

For the classical Cepheid CF Cas we have constructed an O- C diagram spanning a time interval of 129 years. The O- C diagram has the shape of a parabola, which has made it possible to determine for the first time the quadratic light elements and to calculate the rate of evolutionary decrease in the period, dP/ dt = -0.050 (±0.006) syr^-1…