Vol 34, No 5 (2018)

The paper aims at establishing relations between the parameters of methanol maser emission that originates in dense star-forming regions and parameters of a dense core using emission of the CS molecule. A total of 164 sources toward the positions of methanol masers using the RT-22 radio telescope at CrAO, Ukraine, have been observed. For 85 sources, the CS (J = 2–1) line emission was detected. Most of the sources have been selected from catalogs of the class I and class II methanol masers. For methanol masers, this is the most complete survey in the CS (J = 2–1) line on the northern sky. A comparative analysis of parameters of methanol masers spectra in the CS (J = 2–1) line, and methanol masers, luminosities of dense cores, and infrared sources, has been performed. The detection rates of the CS (J = 2–1) line emission, its intensities and widths, the differences between the systematic velocities and velocities of the maser line centers have been investigated. The radiation detection rates in the CS (J = 2–1) line are shown to differ for various source samplings. The form of the dependences lgL_cs – lgL_bol, lgL_mas – lgL_cs and lgL_mas – lgL_bol has been found for sources with which methanol masers are associated. Based on the luminosity of infrared sources, samples of sources in which the CS (J = 2–1) line emission is detected with a higher probability have been determined.

The presence of heterogeneity in turbulent processes has been analyzed, and the spectra of turbulence have been obtained for the regions before and during the dipolarization of the magnetic field in the Earth’s magnetospheric tail from the measurements of four space vehicles of the Cluster-2 mission (the event of September 21, 2005). The spectral and wavelet analysis was supplemented by the investigations of the fluctuation kurtosis for the magnetic field absolute value. In the region of the magnetic field dipolarization in the magnetospheric tail, a decreasing horizontal component of the magnetic field in parts of the tail and an increasing vertical component, kurtosis variations, the presence of strong Pc5 and Pc4 pulsations as well as direct and inverse cascades, a break in the spectra at the frequencies below the proton gyrofrequency, and a change in the character of turbulent motions at different time scales (at large time scales, the turbulent flow corresponds to the homogeneous models of Kolmogorov and Iroshnikov–Kraichnan; at smaller time scales, the turbulent flow is described by the electron magnetohydrodynamic turbulence model) have been detected. Using the measurements from different space vehicles, it was possible to estimate the velocity of the plasma flow in the tail direction.

A catalogue of equatorial coordinates and magnitudes for 2162 asteroids and 11 comets was compiled based on the results of processing of digitized photographic observations of the northern sky performed in 1981–1985. The positions were compared with the JPL DE431 ephemeris. The mean (O – C)_αδ values for all positions obtained in this comparison are –0.08″ and 0.04″, and their root-mean-square errors are 0.70″ and 0.64″ in α and δ, respectively. It was found that the observations of 54 asteroids predate their discoveries, and the observations of four of them are the earliest known for these asteroids.