Zobrazeno 1 - 10
of 93
pro vyhledávání: '"Bondar’, N. I."'
Autor:
Bondar', N. I., Katsova, M. M.
Publikováno v:
Geomagnetism and Aeronomy, 2022, Vol. 62, No. 7, pp. 919-923
BE Cet is a young solar analog with an age of 0.6 Gyr and a rotation period of 7.655 days. According to chromospheric and photospheric indices, its activity is higher than the solar one. An analysis of photometric data on the time interval between 19
Externí odkaz:
http://arxiv.org/abs/2304.14794
Publikováno v:
Geomagnetism and Aeronomy, 2021, Vol. 61, No. 7, pp. 1069-1074
We have carried out a search for flares from the analysis of light curves for 12 active G, K, and M dwarfs. As sources of data we used ground-based observations in 2000-2020 from the photometric databases ASAS, SuperWASP, KWS. Events of low-amplitude
Externí odkaz:
http://arxiv.org/abs/2207.09224
Autor:
Bondar', N. I., Katsova, M. M.
The behavior of the average annual luminosity of K-M dwarfs OU Gem, EQ Vir, V1005 Ori and AU Mic was studied at time intervals of several decades. The main sources of photometric data for 1989-2019 were the Hipparcos, ASAS, KWS databases. An analysis
Externí odkaz:
http://arxiv.org/abs/2011.09879
The bulk of available stellar activity observations is frequently checked for the manifestation of signs in comparison with the known characteristic of solar magnetic modulation. The problem is that stellar activity records are usually an order of ma
Externí odkaz:
http://arxiv.org/abs/2005.11136
Features of the development of activity cycles in the solar-type stars and fast-rotating cool dwarfs have been considered for 65 stars observed in some decades. Cycles with duration of 7-18 years compared to the solar cycle were found for about 50% o
Externí odkaz:
http://arxiv.org/abs/2002.06651
Autor:
Pakhomov, Yu. V., Shenavrin, V. I., Bondar', N. I., Antonyuk, K. A., Pit', N. V., Belan, S. P., Gorda, S. Yu.
Publikováno v:
Astronomy Letters, 2019, Vol.45, No.3, pp.156-163
Based on the multiband (BVRIJHKL) photometric observations of the active red giant PZ Mon performed for the first time in the winter season of 2017-2018, we have determined the main characteristics of the spotted stellar surface in a parametric three
Externí odkaz:
http://arxiv.org/abs/1904.08860
Modern databases and rows of observations allow to make progress in study of magnetic activity of solar-type stars and cold dwarfs. Digitizing of wide-filed plates in the large archives give historical data expanding the investigated time intervals u
Externí odkaz:
http://arxiv.org/abs/1903.05681
Autor:
Bondar, N. I., Katsova, M. M.
Publikováno v:
Geomagnetism and Aeronomy, 2018, Vol. 58, No. 7
Manifestations of activity on the YZ CMi (M4.5Ve) flare star which has a rotation period of 2.77 days and belongs to a group of activity-saturated stars, are considered from long-term photometric data together with photographic measurements from 1926
Externí odkaz:
http://arxiv.org/abs/1902.00493
Autor:
Bondar, N. I.
The main topic of long-term researches by G.A. Shajn is the nature of diffuse matter, its distribu-tion in the Galaxy and extragalactic systems, interaction with the interstellar medium and hot stars, the formation of emission and reflection nebulae
Externí odkaz:
http://arxiv.org/abs/1804.08690
Based on our photometric observations in 2015-2016 and archival photometric data for the active red giant PZ Mon, we have found the main characteristics of the stellar surface: the unspotted surface temperature Teff=4730K, the spot temperature Tspot=
Externí odkaz:
http://arxiv.org/abs/1711.10242