In order to realize the Johnson UBV and Kron-Cousins RI photometricsystems in BFOSC, glass filters were purchased according to the Bessell prescription.All the
The optical flash accompanying GRB 990123 is believed to be powered by the reverse shock of a thin shell. With the best-fit physical parameters forGRB 990123 an
The properties and classification of IRAS 19111+2555 have so far not been well determined. We collect all the available information and data of this star, and t
Using an axisymmetrical ideal MHD model in spherical coordinates, we present a numerical study of magnetic configurations characterized by a levitating flux rop
On 2002 July 23, a 2B/X4.8 flare was observed in the Hα line spec-tropolarimetrically by the Large Solar Vacuum Telescope of Baikal AstrophysicalObservatory. L