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Dust in the disk winds from young stars as a source of the circumstellar extinction
Grinin, V. P.; Tambovtseva, L. V.
We consider the problem of dust grain survival in the disk winds from T Tauri and Herbig Ae stars. For our analysis, we have chosen a disk wind model in which the gas component of the wind is heated through ambipolar diffusion to a temperature of ∼104 K. We show that the heating of dust grains through their collisions with gas atoms is …
Black hole at the center of the globular cluster M15: Estimation of the mass and specific angular momentum
Kiselev, A. A.; Shakht, N. A.; Gnedin, Yu. N. +3 more
Using the technique of determining the sum of the masses of double stars, we have estimated the mass of the central object in the globular cluster M15. The radial velocities of stars at distances up to 1″ from the cluster center have been used. The parameters of circular orbits and the space velocities of 11 selected field stars relative to the cl…
Searching for the host galaxy of GRB 920925C
Pozanenko, A. S.; Loznikov, V. M.; Volnova, A. A. +2 more
GRB 920925C is probably the first cosmic gamma-ray burst with an optical afterglow detected from archival data. We present the results of our observations with the Shajn mirror telescope of the Crimean Astrophysical Observatory aimed at searching for the host galaxy at the afterglow location; we have determined the boundaries of distances to the p…
Emission stratification in two-component HII regions with stellar wind
Sitnik, T. G.; Bychkov, K. V.
To explain the variety of observed optical emission stratification in the shells around Wolf-Rayet stars, we have calculated the nonstationary cooling of a homogeneous gas layer heated to a temperature (0.4-2) × 105 K. We have assumed that the nebula is ionized by its central star and consists of a rarefied gas and a set of clouds with …