26 Result(s)
within
I. S. Savanov
Astronomy, Astrophysics and Cosmology
Space Sciences (including Extraterrestrial Physics, Space Exploration and Astronautics)
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Article
Mass Loss from the Atmosphere of the Planet TOI-1442 c
The properties of the planetary system TOI-1422, in which two planets of a neptune type orbit around a low-activity star of solar type with an age of about 5 billion years, are examined. We have previously ana...
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Article
Activity of the Star TOI-784 and Loss of Atmospheric Mass by Its Planet
The properties of the planetary system TOI-784, in which an earth-like planet orbits a low-activity star of solar type, are examined. Archived V-band measurements of the brightness of TOI-784 in the ASAS 4 dat...
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Article
Mass Loss from the Atmosphere of the Planet WASP-193 b
Results are presented from an analysis of the manifestations of activity of the star WASP-193 of spectral class F9 with a super-neptune-type planet. The gaseous giant WASP-193 b with a mass 0.13 times Jupiter’...
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Article
Activity of the Young Star EPIC 204376071 from the Upper SCO Association
Based on observations from the K2 mission of the Kepler Space Telescope a study is made of the activity of EPIC 204376071, a young object in the Upper SCO association with an age of 11±3 million years whose li...
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Article
Activity of the Star Gl 414A with Two Planets and its Effect on the Loss of Mass of the Atmosphere of the Planet Gl 414A b
Results are presented from a study of manifestations of the activity of the dwarf Gl 414A of spectral class K7 with two planets, one of which (the planet Gl 414A b) with an eccentricity e=0.45 was found to be ...
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Article
Spottedness Activity of the Young Star HIP 94235 from the Moving Group AB Doradus
Based on high-precision data from the archive of the TESS space mission, a study is made of the photometric variability of the brightness of HIP 94235, a bright star belonging to the 120 million years old movi...
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Article
Activity of Stars with Planets in the Habitable Zone
Based on data on stars with planets located in the habitable zone, a study is made of manifestations of their activity. Light curves obtained during observations in the Q3 set with the Kepler Space Telescope f...
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Article
Spottedness Activity of the Young Star TOI 1227 with a Planetary System from Lower Centaurus Crux OB Association (Musca)
Based on high-precision data from the archive of the TESS space mission, a study of the photometric variability of the brightness of TOI 1227, a young member of the Musca group with an age of 11 million years....
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Article
KIC 7732964 – A Possible Candidate FK Com-Type Star
This article is a brief survey of our previous work devoted to searching for candidate type FK Com giant stars and an analysis of data for yet another new candidate, KIC 7732964. Establishing that KIC 7732964 ...
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Article
Activity of Two Young Stars of Solar Type with Planetary Systems from the Ursa Major Moving Group of Stars and the Stream Psc-Eri
High precision data from the archive of the TESS space mission are used as the basis of a study of the photometric variability of two young analogs of the Sun with planetary systems: the stars HD 63433 (TOI 17...
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Article
Differential Rotation of Stars in Spectral Class A
Published data indicate a substantial increase in the differential rotation parameter ∆Ω of stars hotter than 6700 K. By analyzing the shape of the light curves and the presence of a specific set of peaks in t...
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Article
Slowly Rotating Ap Stars, Prospects for Observing Them with the Tess Space Mission
The feasibility of detecting candidate slow-rotating magnetic Ap stars with periods from a few tens of days to several hundred years is considered. The question of the fraction of objects of this kind among al...
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Article
The Program Magreg for Determining the Longitudinal Component of Stellar Magnetic Fields from Spectropolarimetric Observations
The computer program magreg in IDL language has been developed for determining the longitudinal component Bz of the magnetic field of stars. The program has been tested on observations of a number of objects a...
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Article
Activity of the Star bScl Observed by the TESS Space Telescope
The rotational and flare activity of the chemically peculiar star B9.5IIIpHgMnSi βScl is studied using data from the archive of the TESS space mission. Rotational modulation of the brightness is clearly visibl...
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Article
Activity of the Star ET Dra
V-band photometric observations of the FK Com type star ET Dra were made at the Zvenigorod observatory (INASAN) during March-April 2018. The new data were used in a solution of the inverse problem of recoverin...
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Article
Areas, Lifetimes, and Magnetic Fields of Starspots
The results of applying a method developed by us for determining the spottedness parameter A to data on the brightness variation of 34030 objects based on observations with the Kepler space telescope are prese...
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Article
Brightness Variability of 12 ROTD A-Stars
The brightness variability of 12 stars of spectral class A which are type ROTD objects is analyzed. The power spectra of these objects contain characteristic features including a amplitude-dominant narrow peak...
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Article
Vertical Chromium Distribution in the Atmospheres of CP Stars. II. Modeling
Vertical chromium distributions in the atmospheres of several Ap and Am stars are fitted using detailed modeling of the profiles of CrII lines. The vertical distributions obtained for Ap stars are consistent w...
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Article
Vertical Chromium Distribution in the Atmosphere of a Chemically Peculiar Star. I. Diagnostics
On the basis of CCD spectrograms obtained with high resolution at the Coudé focus of the 2.6-m telescope of the Crimean Astrophysical Observatory, Cr II lines lying in the wings of the Hβ hydrogen line are inv...
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Article
The "F str 4077" star HD 177645 as a possible barium dwarf star
The abundances of 12 elements in the atmosphere of the "F str 4077" star HD 177645 have been determined from new spectroscopic observations with the CCD camera and the model atmosphere method. The overabundanc...
