Astronomy Letters
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Models of Magnetospheric Accretion onto Young Stars in the Absence of Ionization Equilibrium
Astronomy Letters - Tập 48 - Trang 29-37 - 2022
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......
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
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......
Long-duration plasma heating in solar microflares of X-ray class A1.0 and lower
Astronomy Letters - - 2013
Fine core-jet structure of the galaxy M87
Astronomy Letters - Tập 37 - Trang 154-170 - 2011
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......
Spatial distribution of the N-S asymmetry of solar activity and its time variations
Astronomy Letters - - 2012
The soft X-ray novae, black-hole candidates XTE J2012+381 and XTE J 1550-564
Astronomy Letters - Tập 28 - Trang 660-668 - 2002
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......
Formation mechanisms of “Negative”-intensity spots in the cosmic microwave background radiation and distant objects
Astronomy Letters - - 2001
Rapid damping of the oscillations of coronal loops with an azimuthal magnetic field
Astronomy Letters - Tập 31 - Trang 406-413 - 2005
We consider the MHD oscillations of an inhomogeneous coronal loop that consists of a dense cord surrounded by a shell. The magnetic field is longitudinal in the cord and has only an azimuthal component in the shell. The parameters of the loop are chosen to be such that there are no resonances; i.e., the resonance points are cut off. This choice is dictated by the formulated problem of considering ......
On the differential rotation of the polar caps of neutron stars
Astronomy Letters - Tập 40 Số 9 - Trang 566-575 - 2014
The nature of the bimodal luminosity distribution of ultraluminous X-ray pulsars
Astronomy Letters - Tập 43 - Trang 464-471 - 2017
The mechanism that can be responsible for the bimodal luminosity distribution of super-Eddington X-ray pulsars in binary systems is pointed out. The transition from the high to low state of these objects is explained by accretion flow spherization due to the radiation pressure at certain (high) accretion rates. The transition between the states can be caused by a gradual change in the accretion ra......
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