Scientific achievements. Galaxy

1999

The structure of gas clouds around a carbon star IRC+10216 was studied for the first time interferometrically at the 6-m telescope with a limiting angular resolution of 0.07″ in the infrared spectral range at 1.6-2.2 micron. The star is at the last stage of its evolution — the transformation into a planetary nebula. A bipolar structure of cloud fragments was detected, the dynamics of the inner part of the nebula was traced, and cloud recession velocity amounting to 15 km/s was measured.

The BTA observations over the past 15 years show that formation of magnetic chemically peculiar stars lasts 10⁵-10⁶ yr by the moment they arrive on the zero age Main Sequence, where the stellar atmospheres stabilize.

According to the observations on the RATAN-600 and the NVSS survey data a new supernova remnant G16.2-2.7 was detected, which belongs to the class of envelope remnants with a high linear polarization. The distance to the source of 6.5 kpc and the 35 pc diameter of envelope remnant were obtained.

The interaction of three supernova remnants with the interstellar medium was studied. Around an old envelope remnant S147 a strong expanding HI envelope was discovered, the parameters of which (the mass of 3×10⁵ M_⊙, the kinetic energy of more than 10⁵¹ erg) allow us to estimate the rate of energy pumping into the interstellar medium as a result of supernova explosions.