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
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 with time depen...
Mass upflows and magnetic-field dynamics in a forming sunspot penumbra
Astronomy Reports - Tập 60 - Trang 280-286 - 2016
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...
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
The angular-momentum distribution in axisymmetrical galaxies
Astronomy Reports - Tập 45 - Trang 751-754 - 2001
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...
Discovery of Emission Pulses from Magnetar SGR 1935+2154
Astronomy Reports - - 2022
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...
Supermassive black holes: Relation to dark halos
Astronomy Reports - Tập 49 - Trang 362-367 - 2005
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 and V m or M i , it is appreciably
weaker than the correlation with the central velocity dispersion. The values of
M bh for ea...
Search for class I methanol maser emission toward several supernova remnants
Astronomy Reports - Tập 55 - Trang 978-988 - 2011
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 emission in these sources. The region G27.4–0.2 has
bee...
A multi-frequency study of brightness variations of the blazar 0716+714
Astronomy Reports - Tập 53 - Trang 777-784 - 2009
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...
Cosmogenic radiocarbon as a means of studying solar activity in the past
Astronomy Reports - Tập 47 - Trang 1054-1062 - 2003
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...
Spectral Observations of the Eruption of a Filament
Astronomy Reports - Tập 63 Số 7 - Trang 608-617 - 2019
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