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Astronomy and Space News from Russia

АстроКосмические Новости из России.

Astronomy and Space News from Russia.

From PAZH (Astronomy Letters) and AZh (Astronomy Reports) August 2000 issues:

Astronomy Letters

  • 1). Low-Frequency Flux-Density Measurements and Spectral Features of Millisecond Pulsars
    A. D. Kuzmin and B. Ya. Losovsky p. 500
  • Abstract.
    • Radio flux-density measurements for a large sample of millisecond pulsars at a low frequency of 102 MHz are presented. Using higher frequency measurements, we construct their spectra in the frequency range from 102 MHz to 4.8 GHz, the widest one studied to date. The spectra of millisecond and normal pulsars have been found to differ. The spectra of millisecond pulsars have no low-frequency turnover typical of normal pulsars. The absence of a low-frequency turnover in the spectrum suggests that the emitting regions of millisecond and normal pulsars differ in geometry, which we interpret by deviation of the magnetic field from a dipole one or by compactness of the emitting region
    Copyright: 2000 MAIK Nauka/Interperiodica.

  • Editor's comments:

    • Astronomy Reports

  • 1). Southern Isolated Galaxy Triplets
    V. E. Karachentseva and I. D. Karachentsev p. 501
  • Abstract.
    • —Seventy-six isolated triple systems of galaxies with declinations < 3 were selected using ESO/SERC and POSS-I sky survey data. The equatorial coordinates, configuration types, angular sizes, com- ponent angular separations, component morphological types, total magnitudes, and other parameters are reported for each triplet. Radial-velocity estimates are available for all components in 33 of the 76 triplets. The median values of the main dynamical parameters—radial-velocity dispersion, mean harmonic radius, absolute magnitudes of member galaxies, and mass-to-luminosity ratios—are similar to those obtained earlier for 83 iso- lated triple systems with \delta > -3 degrees.
    Copyright: 2000 MAIK Nauka/Interperiodica.
  • Editor's comments:

    Сергей Попов