2011

Galaxies with polar rings (PRGs) are a unique class of extragalactic objects, consisting of a ring or disk of gas, stars and dust orbiting in a plane nearly perpendicular to the disk of a central galaxy. More...

The results of long-term monitoring of Gigahertz-Peaked Spectrum sources were found the statistically significant differences (0.05 significance level) in the high-frequency spectral index distribution between subgroups of galaxies and quasars. More...

According to modern views on the evolution and origin of stars, most of the stars are members of binary systems. If both components are massive enough, they eventually go supernova one by one, whereas their cores collapse, turning into black holes or neutron stars. More...

The history of star formation was successfully analyzed for the first time based on the spectra of the stellar population of dwarf galaxies of low surface brightness outside the Local Group. We have investigated the stellar population of two dwarf spheroidal galaxies KDG61 and KDG64 in the central part of a close group of galaxies M81. More...

Solar flare activity is produced by the processes of accumulation and release of energy in an active region. A complex magnetic structure is formed over the spots, the reconnection of which leads to the generation of a flare. The information about the magnetic field can be retrieved from is polarized microwave radiation, the spectrum of which is correlated with the flare activity. More...

As a result of BTA observations of 23 chemically peculiar stars with strong magnetic fields, it was found that in 22 of them the longitudinal magnetic field, measured from the hydrogen line cores are considerably lower (by about 1/3) than the value measured from metal lines in the same spectra. More...

2010

According to the current estimates, a few percent of Main Sequence B5-F5 stars reveal strong surface magnetic fields reaching the values of tens of kilogauss, which is an order of magnitude greater than the maximal magnetic field in sunspots. More...

The close X-ray binary with relativisic jest, contained probably a black hole, Cygnus X-3 has been detected in first time in Gamma-rays at enegries higher 100 íeV (AGILE, Tavani et al., Nature, 2009) during the intense radio flares, monitored with RATAN-600 radio telecope. More...

By means of deep optical images obtained at the Special Astrophysical Observatory 6-m telescope it was discovered that some Seyfert galaxies that were earlier considered to be non-interacting objects displayed signatures of elongated tidal envelopes belonging to satellite debris. More...

CH Cyg is one of the most fascinating as well as the brightest and closest symbiotic stars. It's composed of an M7 giant and a hot companion, most likely an accreting white dwarf. More...

A bright extended nebulosity around a lenticular galaxy NGC 4460 was discovered by Igor Karachentsev and Serafim Kaisin (2008, A&A, 479, 603) during the recent H survey of nearby galaxies on the SAO RAS 6-m telescope. More...

In the spectral observations of stars with infrared circular nebulae, found in the Spitzer survey (24 microns), a new LBV star was discovered in the Galaxy. More...

2009

The brightest of all GRBs known to date, GRB080319B, the "Naked-Eye Burst", has been observed by our colleagues who acquired its detailed optical light curve during the stage of gamma emission. More...

Dwarf galaxy DDO 68 is the closest to us galaxy (D=10Mpc) with the lowest metal content known to date. In this galaxy, using the 6 m BTA telescope, a new massive blue variable star with high luminosity (>=10⁵ Sun's luminocities in visible light) was found. More...

New observations of the RC J0311+0507 radio source using the MERLIN radio interferometer (UK) and the 6-m optical telescope, have added new strokes to the "portrait" of this unusual object, - one of the most powerful and distant radio galaxies (z=4.51), and raised new questions about the origin of the first galaxies in the early Universe. More...

A new bright LBV (Luminous Blue Variable) star was found in M33 galaxy. More...

The most metal-poor system of four subdwarfs discovered in the solar neighbourhood. More...

Identification and Early Spectroscopic Observations of the Optical Transient GRB090726. More...