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Sergei V.Antipin Ignacio Becker AlexANDer A.Belinski Darya M.Kolesnikova Karim Pichara Nikolay N.Samus Kirill V.Sokolovsky Alla V.Zharova Alexandra M.Zubareva 《天文和天体物理学研究(英文版)》2018,(8)
Using 172 plates taken with the 40-cm astrograph of the Sternberg Astronomical Institute(Lomonosov Moscow University) in 1976–1994 and digitized with a resolution of 2400 dpi, we discovered and studied 275 new variable stars. We present the list of our new variables with all necessary information concerning their brightness variations. As in our earlier studies, the new discoveries show a rather large number of high-amplitude Delta Scuti variables, predicting that many stars of this type remain not detected in the whole sky. We also performed automated classification of the newly discovered variable stars based on the Random Forest algorithm. The results of the automated classification were compared to traditional classification and showed that automated classification was possible even with noisy photographic data. However, further improvement of automated techniques is needed, which is especially important when considering the very large numbers of new discoveries expected from all-sky surveys. 相似文献
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D. M. Kolesnikova L. A. Sat K. V. Sokolovsky S. V. Antipin A. A. Belinskii N. N. Samus’ 《Astronomy Reports》2010,54(11):1000-1018
In the course of a program to digitize the astronomical plates of the Sternberg Astronomical Institute’s plate stacks, we
are developing algorithms for searching for new variable stars and studying them using digitized photographic plates. We have
discovered and studied 480 new variable stars in a 10° × 10° field of view centered on 66 Ophiuchi. The digitized plate negatives
used are from the 40-cm astrograph, and are 30 × 30 cm in size. These stars include three new Cepheids of the Galaxy’s spherical
component, 157 eclipsing binaries, 11 high-amplitude δ Scuti stars (HADSs), 144 RR Lyrae stars, 110 irregular variables (109 LB and one white star), and 55 semi-regular red variables.
New important information has been obtained for 43 known variables, which we have classified and derived or improved their
light elements; an erroneous identification of the Mira V404 Oph has been corrected. We have also identified more than 50
suspect brightness variables; a program of CCD observations of these suspected variables has been initiated. Our discoveries
of new variable stars were performed in a star field with a large number of known variables, detected earlier photographically
or using CCD techniques. The discovery of hundreds of new variables in a well-studied region of sky demonstrates that archive
photographs possess a large information potential that has remained unrealized. 相似文献
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K. V. Sokolovsky S. V. Antipin A. M. Zubareva D. M. Kolesnikova A. A. Lebedev N. N. Samus’ L. A. Sat 《Astronomy Reports》2014,58(5):319-327
The new stage of work on digitizing the astronomical plates of the Sternberg Astronomical Institute’s collection and searching for new variable stars using the digitized photographic plates includes a considerable improvement of the automated search techniques for objects with variable brightnesses. In particular, the technique for taking into account the non-linear response of the photographic light detector has been improved. Applying the improved techniques to 182 digitized images of a 10° × 10° field centered at SA9, obtained from scanning photographic plates taken with the Sternberg Astronomical Institute 40-cm astrograph, has enabled the discover and study of 77 new variable stars (MDV 519–595). These include 3 Cepheids, 2 probable BY Draconis stars, 65 eclipsing binaries, 3RR Lyrae stars, 1 high-amplitude δ Scuti star (HADS), and 3 irregular variables. Special CCD observations have confirmed the presence of brightness variations in 7 of the 77 variables that were initially considered uncertain. 相似文献
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Antipin S. V. Zubareva A. M. Belinski A. A. Burlak M. A. Ikonnikova N. P. Sokolovsky K. V. 《Astronomy Letters》2020,46(10):677-690
Astronomy Letters - Results of the first multicolor photometric observations of the unusual dwarf nova V2466 Cygni during its 2003 and 2019 superoutbursts are presented. The total amplitude of the... 相似文献
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As a result of applying the original optical variability search method on publicly available data, we have found eight new
cataclysmic variables and two possible Optically Violent Variable quasars among the previously unidentified X-ray sources
in the ROSAT catalog. We describe the search method and present the characteristics of the newly identified variable stars.
The obtained results demonstrate the large potential of the concept of Virtual Observatory for identifying new objects of
astrophysical interest. 相似文献
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N. S. Kardashev A. V. Alakoz A. S. Andrianov M. I. Artyukhov W. Baan V. E. Babyshkin N. Bartel O. S. Bayandina I. E. Val’tts P. A. Voitsik A. Z. Vorobyov C. Gwinn J. L. Gomez G. Giovannini D. Jauncey M. Johnson H. Imai Y. Y. Kovalev S. E. Kurtz M. M. Lisakov A. P. Lobanov V. A. Molodtsov B. S. Novikov A. V. Pogodin M. V. Popov A. S. Privesenzev A. G. Rudnitski G. M. Rudnitski T. Savolainen T. V. Smirnova A. M. Sobolev V. A. Soglasnov K. V. Sokolovsky E. N. Filippova V. V. Khartov M. E. Churikova A. E. Shirshakov V. I. Shishov P. Edwards 《Solar System Research》2017,51(7):535-554
The RadioAstron ground-space interferometer provides the highest angular resolution achieved now in astronomy. The detection of interferometric fringes from quasars with this angular resolution on baselines of 100–200 thousand km suggests the brightness temperatures which exceed the Compton limit by two orders of magnitude. Polarimetric measurements on ground-space baselines have revealed fine structure testifying to recollimation shocks on scales of 100–250 μas and a helical magnetic field near the base of radio emission in BL Lacertae. Substructure within a the scattering disk of pulsar emission on interferometer baselines (from 60000 to 250000 km) was discovered. This substructure is produced by action of the interstellar interferometer with an effective baseline of about 1 AU and the effective angular resolution of better than 1 μas. Diameters of scattering disks were measured for several pulsars, and distances to diffusing screens were evaluated. The ground-space observations of sources of the maser radiation in lines of water and hydroxyl have shown that the maser sources in star-forming regions remain unresolved on baselines, which considerably exceed the Earth diameter. These very compact and bright features with angular sizes of about 20–60 μas correspond to linear sizes of about 5–10 million km (several solar diameters). 相似文献
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