High Speed Phase-Resolved 2-d UBV Photometry of the Crab pulsar

We report a phase-resolved photometric and morphological analysis of UBV data of the Crab pulsar obtained with the 2-d TRIFFID high speed optical photometer mounted on the Russian 6m telescope. By being able to accurately isolate the pulsar from the nebular background at an unprecedented temporal resolution (1 \mu s), the various light curve components were accurately fluxed via phase-resolved photometry. Within the $UBV$ range, our datasets are consistent with the existing trends reported elsewhere in the literature. In terms of flux and phase duration, both the peak Full Width Half Maxima and Half Width Half Maxima decrease as a function of photon energy. This is similarly the case for the flux associated with the bridge of emission. Power-law fits to the various light curve components are as follows; \alpha = 0.07 \pm 0.19 (peak 1), \alpha = -0.06 \pm 0.19 (peak 2) and \alpha = -0.44 \pm 0.19 (bridge) - the uncertainty here being dominated by the integrated CCD photometry used to independently reference the TRIFFID data. Temporally, the main peaks are coincident to \le 10 \mu s although an accurate phase lag with respect to the radio main peak is compromised by radio timing uncertainties. The plateau on the Crab's main peak was definitively determined to be \leq 55 \mu s in extent and may decrease as a function of photon energy. There is no evidence for non-stochastic activity over the light curves or within various phase regions, nor is there evidence of anything akin to the giant pulses noted in the radio. Finally, there is no evidence to support the existence of a reported 60 second modulation suggested to be as a consequence of free precession.Comment: 13 pages, 12 figures, accepted for publication in Astronomy & Astrophysic

Physical education for young students. Typologies, gaps, challenges

In the current 21st century situation, some services priorities have changed significantly, but there are always unshakable pillars. One of these pillars is physical culture. The impact of physical education and sport in General on human health, its development (both physical and spiritual) is difficult to overestimate. No wonder there are such sayings as: "In healthy body – healthy spirit" and "Sport is life. In his article, we turn to consider the approaches to organization of physical education in schools, and also to track the challenges the modern University sport facesВ сложившейся в 21-ом веке ситуации, некоторые общественные приоритеты существенно изменились, но всегда есть незыблемые столпы. Одним из таких столпов является физическая культура. Влияние физкультуры и спорта в целом на здоровье человека, на его развитие (как физическое, так и духовное) сложно переоценить. Не зря ведь существуют такие пословицы как: «В здоровом теле – здоровый дух» и «Спорт – это жизнь. В своей статье мы беремся рассмотреть подходы к организации физического воспитания в учебных заведениях, а также проследить те вызовы, с которыми современный студенческий спорт сталкиваетс

A Search for the Optical Counterpart of PSR B1951+32 in the Supernova Remnant CTB 80

Using time-resolved two-dimensional aperture photometry we have put upper limits on the pulsed emission from two proposed optical counterparts for PSR B1951+32. Our pulsed upper limits of m_{vpulsed}>23.3, m_{bpulsed}>24.4$, for the first candidate and m_{vpulsed}>23.6$, m_{bpulsed}>24.3 for the second, make it unlikely that either of these is, in fact, the pulsar. We discuss three further candidates, but also reject these on the basis of timing results. A search of a 5.5arcs x 5.5arcs area centred close to these stars failed to find any significant pulsations at the reported pulsar period.Comment: 5 pages, 4 figures, typos correcte

FAVOR (FAst Variability Optical Registration) -- A Two-telescope Complex for Detection and Investigation of Short Optical Transients

An astronomical complex intended to detect optical transients (OTs) in a wide field and follow them up with high time resolution investigation is described.Comment: 4 pages, 3 figures. To be published in "Il Nuovo Cimento", Proceedings of the 4th Rome Workshop on Gamma-Ray Bursts in the Afterglow Era, eds. L. Piro, L. Amati, S. Covino, B. Gendr

Optical Investigation Of The Crab Pulsar: Simultaneous Ubvr Light Curves With Time Resolution Of 3.3

The results of the Crab pulsar observations with the photometrical MANIA (Multichannel Analysis of Nanosecond Intensity Alterations) comlex at the 6-m telescope are presented. More than 12 millions photons in UBVRbands simultaneously with time resolution of 10 \Gamma7 s were detected. Using the original software for search for optical pulsar period, we obtained the light curves of the object with time resolution of about 3.3 ¯s. Their detailed analysis gives the spectral change during pulse and subpulse, the shape of the pulse peaks, which are plateaus (with the duration of about 50 ¯s for the main pulse), limits for an amplitude of fine temporal (stochastic and regular) structure of pulse and subpulse and the interpulse space intensity. The results of CCD-spectroscopy of the Crab pulsar show that its summarized spectrum is flat. There are no lines, neither emission nor absorbtion ones. Upper limit for line intensity or depth is 3.5% with the confidence probability of 95%. Key Words..