Astronomy Reports

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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
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
Gravitational Capture as a Possible Scenario Origin of the Moon
Astronomy Reports - Tập 67 - Trang 1236-1250 - 2024
A. V. Tutukov, G. N. Dremova, V. V. Dremov
The paper is devoted to the problem of the origin of the Moon. The discussed modern scenarios for the formation of the Earth–Moon system are: simultaneous formation of the Earth and the Moon in the circumsolar gas-dust disk; impact partial destruction of the Earth by a massive asteroid; gravitational capture of the Moon by the Earth; and destruction of the double Moon at the beginning when approac...... hiện toàn bộ
Observations of stellar objects at a shell boundary in the star-forming complex in the galaxy IC 1613
Astronomy Reports - Tập 46 Số 1 - Trang 16-26 - 2002
T. A. Lozinskaya, В. П. Архипова, А. В. Моисеев, В. Л. Афанасьев
Optical variability of the blazar 2007 + 777
Astronomy Reports - Tập 47 - Trang 1-5 - 2003
V. S. Bychkova, N. S. Kardashev, V. V. Vlasyuk, O. I. Spiridonova
We present the results of optical monitoring of the blazar 2007 + 777 on the 60-cm Zeiss-600 reflector of the Special Astrophysical Observatory of the Russian Academy of Sciences. Light curves in the B and V bands obtained from August 8, 2000, through May 25, 2001, reveal variability with characteristic time scales from 10 to 40 days.
Methanol proplyds and a double protoplanetary system in the constellation Norma
Astronomy Reports - Tập 49 - Trang 316-326 - 2005
I. E. Val’tts, S. Yu. Lyubchenko
We have carried out detailed studies of a star-forming region containing two maser sources in the constellation Norma. The sources display a complex spectral distribution of the maser lines and spatial distribution of the maser condensations. The maser condensations may have formed around objects that are hidden by dense molecular cocoons; the velocities of the maser features may represent Kepleri...... hiện toàn bộ
Orbital period variations of the eclipsing binaries TU Cnc, VZ Leo, and OS Ori
Astronomy Reports - Tập 61 - Trang 859-870 - 2017
A. I. Khaliullina
Variations of the orbital periods of the eclipsing binaries TU Cnc, VZ Leo, and OS Ori are analyzed. Secular period decreases were earlier believed to occur in these systems. It is demonstrated that the period variations of TU Cnc can be represented using the light-time effect corresponding to the orbital motion of the eclipsing binary with a period of 78.6 years around the center ofmass of the tr...... hiện toàn bộ
The intermediate-age pre-cataclysmic variables SDSS J172406+562003 and RE J2013+4002
Astronomy Reports - Tập 56 - Trang 441-455 - 2012
V. V. Shimansky, N. V. Borisov, D. N. Nurtdinova, A. A. Mitrofanova, V. V. Vlasyuk, O. I. Spiridonova
We have analyzed the physical status of the pre-cataclysmic variables SDSSJ172406+562003 and RE J2013+4002, which have evolved after their common-envelope stage a time t = 106−107 years. Spectroscopy and photometry of these systems were performed with the 6-m and 1-m telescopes of the Special Astrophysical Observatory. We demonstrate that emission lines in the spectra were formed solely by the ref...... hiện toàn bộ
PN G068.1+11.0: A young pre-cataclysmic variable with an extremely hot primary
Astronomy Reports - - 2016
A. A. Mitrofanova, V. V. Shimansky, N. V. Borisov, O. I. Spiridonova, M. M. Gabdeev
Comparison of Terrestrial and Lunar Time Scales by Giant Pulsar Impulses
Astronomy Reports - Tập 65 - Trang 1136-1144 - 2021
A. E. Rodin, V. V. Oreshko, V. A. Fedorova
We have developed a model for the time delay of pulse arrival between stations on the Moon and Earth. Comparison of the lunar and terrestrial time scales is proposed to be carried out by comparing the arrival time moments of giant pulses from pulsars. A method for such a comparison has been developed based on the cross-correlation analysis of the received pulses. Using the example of giant pulses ...... hiện toàn bộ
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