Alina Volnova

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How black holes accrete surrounding matter is a fundamental yet unsolved question in astrophysics. It is generally believed that matter is absorbed into black holes via accretion disks, the state of which depends primarily on the mass-accretion rate. When this rate approaches the critical rate (the Eddington limit), thermal instability is supposed to occur(More)
Aims. To derive observational properties and physical parameters of the progenitor stars of type IIP supernovae SN 2005ay and SN 2005cs from their U, B,V,R, I CCD photometry, and to define their velocity behaviour. Methods. Light curves are analysed, and the velocities and spectral characteristics of SN 2005cs are obtained using synthetic spectra modeling.(More)
We present UBV RI CCD photometry for type II-P supernovae SN 2005ay and SN 2005cs, and one spectrum for SN 2005cs. We find that both supernovae are fainter than the average SN II-P, while SN 2005cs is more subluminous and shows brightening at the second half of plateau stage in the V RI bands, large luminosity decline between the plateau and exponential(More)
Context. We present observations of the GRB 080319B afterglow at optical, mm, and radio frequencies between a few hours and 67 days after the burst. Aims. We attempt to understand the nature of this extraordinarily bright explosion based on the observed properties and its comparison with afterglow models. Methods. Our observations and other published(More)
Aims. To derive observational properties and physical parameters of the progenitor stars of type IIP supernovae SN 2005ay and SN 2005cs from their U, B,V,R, I CCD photometry, and to define their velocity behaviours. Methods. Light curves are analysed, while velocities and spectral characteristics of SN 2005cs are obtained using synthetic spectra modeling.(More)
The goal of this survey is to analyze the global trends for development of massive data collections and related infrastructures in the world aimed at the evaluation of the opportunities for the shared usage of such collections during research, decision making and problem solving in various data intensive domains (DIDs) in Russia. The representative set of(More)
Рассмотрены примеры возможных сигналов, сопровождающих источники гравитационных волн, обсуждаются проблемы поиска этих сигналов в различных диапазонах электромагнитного излучения, наборы данных для такого поиска, типы данных, на которых производится поиск, и сформулированы требования к поиску. В качестве примера рассматриваются впервые зарегистрированные в(More)
The U,B,V,R, I light curves of the type IIP supernovae (SNe IIP) SN 2005ay and SN 2005cs, and one spectrum for SN 2005cs, are presented and analyzed. We found both events to be fainter than the average SN IIP, with SN 2005cs showing slight brightening in the second half of plateau stage in the V,R, I bands and a low expansion velocity. The effects of two(More)
Context. We present observations of the afterglow of GRB 080319B at optical, mm and radio frequencies from a few hours to 67 days after the burst. Aims. To understand the nature of this brightest explosion based on the observed properties and it’s comparison with the afterglow models. Methods. Present observations along with other published multi-wavelength(More)
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