Astronomy Letters

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A hydrodynamic model for asymmetric explosions of rapidly rotating collapsing supernovae with a toroidal atmosphere
Astronomy Letters - Tập 30 - Trang 803-815 - 2004
V. S. Imshennik, K. V. Manukovskii
We numerically solved the two-dimensional axisymmetric hydrodynamic problem of the explosion of a low-mass neutron star in a circular orbit. In the initial conditions, we assumed a nonuniform density distribution in the space surrounding the collapsed iron core in the form of a stationary toroidal atmosphere that was previously predicted analytically and computed numerically. The configuration of ...... hiện toàn bộ
Models of Magnetospheric Accretion onto Young Stars in the Absence of Ionization Equilibrium
Astronomy Letters - Tập 48 - Trang 29-37 - 2022
D. V. Dmitriev, V. P. Grinin
The formation of hydrogen emission lines in the magnetospheres of young stars is considered. The magnetosphere is assumed to be formed by a dipole magnetic field whose axis is aligned with the stellar rotation axis. The radiative transfer in spectral lines is considered in the Sobolev approximation with nonlocal radiative coupling. We have taken into account the effect of gas ionization fraction t...... hiện toàn bộ
Anomalies in the evolution of global and large-scale solar magnetic fields as the precursors of several upcoming low solar cycles
Astronomy Letters - Tập 35 - Trang 247-252 - 2009
V. N. Obridko, B. D. Shelting
Anomalies in the solar magnetic fields of various scales are studied. The polar magnetic field strength is shown to have decreased steadily during the last three solar cycles. This is because the increase in the dipole magnetic moment observed from 1915 to 1976 has changed into a decrease in the last three cycles. At the same time, the medium scale magnetic fields (like those of isolated coronal h...... hiện toàn bộ
Long-duration plasma heating in solar microflares of X-ray class A1.0 and lower
Astronomy Letters - - 2013
А. М. Кириченко, С. А. Богачев
Photometric observations of Cepheids from the ASAS-3 catalog: Photoelectric BV I c observations of 46 low-amplitude Cepheids
Astronomy Letters - Tập 35 - Trang 311-320 - 2009
L. N. Berdnikov, A. Yu. Kniazev, V. V. Kravtsov, E. N. Pastukhova, D. G. Turner
From December 2006 to January 2008, we performed 1699 BV I c observations for 46 low-amplitude Cepheids discovered in the course of the ASAS project using the 76-cm telescope of the South-African Astronomical Observatory (SAAO). We provide the tables of observations and V light and B-V and V-I c color curves. These new observations, along with data f...... hiện toàn bộ
Fine core-jet structure of the galaxy M87
Astronomy Letters - Tập 37 - Trang 154-170 - 2011
L. I. Matveyenko, S. V. Seleznev
The fine core-jet structure of the radio galaxy M87 has been investigated in the millimeter-decimeter wave band. A counterjet whose extent is ρ(λ) ≈ 0.036λ pc, where the wavelength λ is expressed in centimeters, has been identified. At a wavelength of 2 cm, the brightness of the jet and counterjet decreases exponentially to the minimally detectable level. However, the decline for the jet slows dow...... hiện toàn bộ
New Estimates of the Merger Rate of Primordial Black Holes with Allowance for Clustering Dark Matter
Astronomy Letters - Tập 48 - Trang 561-567 - 2023
M. V. Tkachev, S. V. Pilipenko
The merger rate of primordial black holes (PBHs) is numerically estimated by taking into account the gravitational interaction of PBHs with clustering cold dark matter (DM). The mass and initial separation have values appropriate for the explanation of LIGO/Virgo events by the merging of binary PBHs. We refine the criterion for the merging of a pair of black holes, provided that a DM halo is forme...... hiện toàn bộ
Spatial distribution of the N-S asymmetry of solar activity and its time variations
Astronomy Letters - - 2012
O. G. Badalyan
The soft X-ray novae, black-hole candidates XTE J2012+381 and XTE J 1550-564
Astronomy Letters - Tập 28 - Trang 660-668 - 2002
N. L. Aleksandrovich, V. A. Aref'ev
In 1998–1999, the X-ray transients XTE J2012+381 and XTE J1550-564 were observed with the TTM X-ray telescope onboard the Mir-Kvant astrophysical module. Spectral properties of these sources on the descent of the light curve after the secondary maxima of their outbursts are studied. Upper limits on the off-state flux are given. Comparison with other X-ray novae observed with the TTM telescope lead...... hiện toàn bộ
Formation mechanisms of “Negative”-intensity spots in the cosmic microwave background radiation and distant objects
Astronomy Letters - - 2001
В. К. Дубрович
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