Astronomy Reports

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Enhancement of surface helium abundance in intermediate-mass main-sequence stars
Astronomy Reports - Tập 58 - Trang 808-824 - 2014
E. I. Staritsin
The evolution of rapidly rotating 8, 4, and 2 M ⊙ main-sequence stars is considered together with hydrodynamical transfer in their interiors. The conditions under which turbulent erosion, semiconvection, and shear turbulence lead to partial mixing of the matter in the radiative envelope and central regions of the stars are determined. The enhancement of the surface helium abundance...... hiện toàn bộ
Mass upflows and magnetic-field dynamics in a forming sunspot penumbra
Astronomy Reports - Tập 60 - Trang 280-286 - 2016
V. M. Grigor’ev, L. V. Ermakova
The formation of the penumbra of the leading spot of the active region NOAA 11117 has been studied using data fromthe Solar DynamicObservatory (SDO). HMI data on longitudinal magnetic fields, line-of-sight velocities, and continuum images were used. The appearance of localized upflows between the umbra and undisturbed photosphere precedes the penumbra formation. The sizes of them reach 1.5″–2″ and...... hiện toàn bộ
The effect of the ionization rate on the chemical composition of dense cores of dark molecular clouds
Astronomy Reports - Tập 48 Số 9 - Trang 705-715 - 2004
M. S. Kirsanova, D. S. Wiebe
The angular-momentum distribution in axisymmetrical galaxies
Astronomy Reports - Tập 45 - Trang 751-754 - 2001
B. P. Kondratyev
We investigate the angular-momentum distribution in a classical homogeneous Maclaurin spheroid. An exact formula for the distribution as a function of the mass of a cylindrical column in the spheroid is obtained in both integral and differential forms. This expression is used to calculate the angular-velocity distributions in galaxies evolving from initially spheroidal configurations to steady-sta...... hiện toàn bộ
Discovery of Emission Pulses from Magnetar SGR 1935+2154
Astronomy Reports - - 2022
A. E. Rodin, V. A. Fedorova
In the paper, observation results of the magnetar SGR 1935+2154 at the frequency 111 MHz by the LPA (BSA) FIAN radio telescope are presented. For the search of single non-periodic pulses, we used data recorded in the six-frequency channel mode with a temporal resolution of 0.1 s in the receiver band 110.25 ± 1.25 MHz. As a result of data analysis for the period from September 1, 2019 to March 1, 2...... hiện toàn bộ
Supermassive black holes: Relation to dark halos
Astronomy Reports - Tập 49 - Trang 362-367 - 2005
A. V. Zasov, L. N. Petrochenko, A. M. Cherepashchuk
Estimates of the masses of supermassive black holes (M bh ) in the nuclei of disk galaxies with known rotation curves are compared with estimates of the rotational velocities V m and the “indicative” masses of the galaxies M i . Although there is a correlation between M bh ...... hiện toàn bộ
Search for class I methanol maser emission toward several supernova remnants
Astronomy Reports - Tập 55 - Trang 978-988 - 2011
I. D. Litovchenko, A. V. Alakoz, I. E. Val’tts, G. M. Larionov
Observations at 44 GHz in the 70−61 A + methanol line have been carried out on the 20-m telescope of the Onsala Space Observatory (Sweden) in the directions of the poorly studied region G27.4–0.2 and of several supernova remnants, at the coordinates of the OH(1720) maser satellite emission, with the aim of searching for Class I methanol maser emissio...... hiện toàn bộ
A multi-frequency study of brightness variations of the blazar 0716+714
Astronomy Reports - Tập 53 - Trang 777-784 - 2009
A. E. Vol’vach, M. G. Larionov, N. S. Kardashev, A. Lähteemmäki, M. Tornikoski, T. Hovatta, E. Nieppola, I. Torniainen, M. F. Aller, H. D. Aller
Based on long-term monitoring at five radio frequencies between 4.8 and 37 GHz performed at the Radio Astronomy Laboratory of the Crimean Astrophysical Observatory, the University of Michigan Radio Astronomy Observatory, and the Metsähovi Radio Observatory, we have analyzed two flare events in the blazar S5 0716+714 during the last five years. The time separation between the flares is in agreement...... hiện toàn bộ
Cosmogenic radiocarbon as a means of studying solar activity in the past
Astronomy Reports - Tập 47 - Trang 1054-1062 - 2003
G. E. Kocharov, M. G. Ogurtsov, S. L. Tsereteli
A series of yearly data on the concentration of radioactive carbon 14C in tree rings measured at the Tbilisi State University in 1983–1986 and covering the time interval 1600–1940 is statistically analyzed. We find evidence for a 22-year cyclicity in the intensity of Galactic cosmic rays (GCRs) during the Maunder minimum of the solar activity (1645–1715), testifying that the solar dynamo mechanism...... hiện toàn bộ
Spectral Observations of the Eruption of a Filament
Astronomy Reports - Tập 63 Số 7 - Trang 608-617 - 2019
G. P. Mashnich, Aleksandr Kiselev
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