Results 121 to 130 of about 4,446 (153)

Spectral observations of red dwarfs II. New observations of flare stars in the Pleiades cluster region

Astrophysics, 1994
We studied the spectra of 24 flare stars of the Pleiades cluster region obtained on the 2.6m telescope of the Byurakan observatory in the years 1986–1989. From the spectral indices of titanium oxide (TiO) and other chemical elements of the stars investigated we determined their spectral classes and luminosities (absolute visual stellar magnitudes). The
L. V. Mirzoyan, V. V. Ambaryan, A. T. Garibdzhanyan   +2 more
openaire   +1 more source

Investigation of flare activity of the red dwarf star EV Lac based on original observations and using the data from ground-based and space surveys

2022
The problem of energetics of flare activity of dwarf stars in the lower main sequence of the Hertzsprung-Russell diagram is relevant in the context of the detection of powerful flares (superflares) and the possibility of assessing such phenomena on the Sun in the past and future. A brief historical review of the EV Lac original researches is presented,
Shlyapnikov, A.A., Gorbachev, M.A.
openaire   +1 more source

Magnetic activity of M dwarf stars from the LAMOST DR10 medium-resolution survey

Astronomy & Astrophysics
Aims. M dwarf stars (red dwarfs) are the most common stars in the Milky Way (70$%$ of all stars). Their temperatures and masses are low, but their magnetic activity is strong and includes flares, starspots, and coronal mass ejections.
Wenjie Li, Li-yun Zhang, Tianhao Su, Yinpeng Wang, Xianming L. Han, Prabhakar Misra   +5 more
semanticscholar   +1 more source

Origin of the Blue Continuum Radiation in the Flare Spectra of dMe Stars

Astrophysics, 2016
Calculations of the emission spectrum of a homogeneous plane layer of pure hydrogen plasma taking into account nonlinear effects (the influence of bremsstrahlung and recombination radiation of the layer itself on its Menzel factors) show that the Planck ...
E. Morchenko
semanticscholar   +2 more sources

Emission lines in the spectrum of the red-dwarf flare star EV Lac: Modeling of the quiescent chromosphere

Astronomy Reports, 2001
We present spectral observations of the red-dwarf flare star EV Lac made at the Crimean Astrophysical Observatory in 1994 and 1995, and describe a method for semi-empirical modeling of the chromospheres of red dwarfs based on their emission spectra.
E. A. Baranovskii, R. E. Gershberg, D. N. Shakhovskoi   +2 more
openaire   +1 more source

Coordinated observations of the red dwarf flare star EV Lac in 1998

2019
The results of photometric studies of the flare star EV Lac obtained in the course of cooperative observations in 1998 are presented. No significant brightness variations in IR were found from simultaneous observations of the star in UBVRI and H bands, in coincidence with the observed optical flares.
Alekseev, I.Yu., Antov, A.P., Avgoloupis, S.J., Beskin, G.M., Borisov, N.V., Chalenko, V.E., Contadakis, M.E., Gershberg, R.E., Khalak, V.R., Konstantinova-Antova, R.K., Larionov, V.M., Panferova, I.P., Plokhotnichenko, V.L., Pustil???nik, L.A., Romanyuk, Ya.O., Seiradakis, J.-H., Sergeev, S.G., Svyatogorov, O.A., Verlyuk, I.A., Zhilyaev, B.E.   +19 more
openaire   +1 more source

Spectroscopic observations of red dwarfs I. Flare stars in the Pleiades

Astrophysics, 1991
L. V. Mirzoyan, V. V. Ambaryan, A. T. Garibdzhanyan   +2 more
openaire   +1 more source

Reducing brassinosteroid signalling enhances grain yield in semi-dwarf wheat

Nature, 2023
Jie Liu
exaly  

A bright γ-ray flare interpreted as a giant magnetar flare in NGC 253

Nature, 2021
Dmitry S Svinkin, Dmitry D Frederiks, Kevin Hurley   +2 more
exaly  

Time resolved spectroscopic observations of an M-dwarf flare star EV Lac during a flare.

, 2016
S. Honda, S. Notsu, H. Maehara, K. Shibata, G. Feiden, D. Nogami, Y. Notsu, K. Namekata   +7 more
semanticscholar   +1 more source