Stars of spectral types O and B produce neutron stars (NSs) after supernova explosions. Most of NSs are strongly magnetized including normal radio pulsars with B ∝ 1012 G and magnetars with B ∝ 1014 G. A fraction of 7–12 per cent of massive stars are also magnetized with B ∝ 103 G and some are weakly magnetized with B ∝ 1 G. It was suggested that magnetic fields of NSs could be the fossil remnants of magnetic fields of their progenitors. This work is dedicated to study this hypothesis. First, we gather all modern precise measurements of surface magnetic fields in O, B, and A stars. Secondly, we estimate parameters for lognormal distribution of magnetic fields in B stars and found μB = 2.83 ± 0.1 log10 (G), σB = 0.65 ± 0.09 for strongly magnetized and μB = 0.14 ± 0.5 log10 (G), $\sigma =0.7_{-0.27}^{+0.57}$ for weakly magnetized. Third, we assume that the magnetic field of pulsars and magnetars have 2.7-dex difference in magnetic fields and magnetars represent 10 per cent of all young NSs and run population synthesis. We found that it is impossible to simultaneously reproduce pulsars and magnetars populations if the difference in their magnetic fields is 2.7 dex. Therefore, we conclude that the simple fossil origin of the magnetic field is not viable for NSs.
Supernovae (SNe) inject ∼1051 erg in the interstellar medium, thereby shocking and heating the gas. A substantial fraction of this energy is later lost via radiative cooling. We present a post-processing module for the flash code to calculate the cooling radiation from shock-heated gas using collisional excitation data from mappings v. When applying this tool to a simulated SN remnant (SNR), we find that most energy is emitted in the EUV. However, optical emission lines ([O III], [N II], [S II], Hα, Hβ) are usually best observable. Our shock detection scheme shows that [S II] and [N II] emissions arise from the thin shell surrounding the SNR, while [O III], H$\rm \alpha$, and H$\rm \beta$ originate from the volume-filling hot gas inside the SNR bubble. We find that the optical emission lines are affected by the SNR’s complex structure and its projection onto the plane of the sky because the escaping line luminosity can be reduced by 10 – 80% due to absorption along the line-of-sight. Additionally, the subtraction of contaminating background radiation is required for the correct classification of an SNR on the oxygen or sulphur BPT diagrams. The electron temperature and density obtained from our synthetic observations match well with the simulation but are very sensitive to the assumed metallicity.
Introduction. The real situation in the economic, political and educational spheres hinders the development of intellectual and professional resources of technical intelligentsia. The purpose of the study is to identify objective conditions and subjective factors that determine the labor activity of modern Russian technical intelligentsia as a personnel basis for socio-economic changes and innovative transformations in the country. Materials and Methods. Official statistics and legislative acts were used as the materials for an analysis of the objective conditions. The methodological principles of historicism and socio-historical continuity, the methods of mathematical statistics were applied. When interpreting subjective factors, the empirical data obtained using the methods of the mass survey “Modernization of the Economy and Technical Intelligentsia” and the expert survey “Innovative Activity of Technical Intelligentsia” were examined. The surveys made it possible to reveal technical intelligentsia’s opinion – an assessment of current events in terms of adaptation to market relations and crises of recent years, job satisfaction, material remuneration for one’s work, value orientations. Results. The study made it possible to identify the objective conditions (the economic situation of the country, the state of institutions of education, etc.) and the subjective factors (the degree and level of labor adaptation of technical intelligentsia to the ongoing socio-economic transformations of recent decades, job satisfaction, etc.) that characterize modern Russian technical intelligentsia. The performed analysis of these conditions and factors indicates the difficulties for implementing a large-scale innovative breakthrough both in Russia’s economy and society as a whole. Discussion and Conclusion. Modern objective conditions determining the development of technical intelligentsia do not contribute to the completion of its traditional social mission – to be the pillar of scientific, technological and innovative transformations. The article is of practical importance for government agencies at various levels, for public organizations working to improve policies in the field of innovation in industry, science and education. Empirical data can be used for further scientific interpretations, as well as for diagnostics and advice on targeted support to enterprises and organizations in the productive sector.
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