scholarly journals New Evidence of Chromospheric Evaporation

1998 ◽  
Vol 167 ◽  
pp. 397-400 ◽  
Author(s):  
J. Kašparová ◽  
P. Kotrč ◽  
P. Heinzel ◽  
I.F. Nikulin ◽  
P. Rudawy
Keyword(s):  
Astronomical Institute ◽  
Gradual Phase ◽  
Chromospheric Evaporation ◽  
Sternberg Astronomical Institute ◽  
Blue Wing ◽  
Flare Ribbon ◽  
New Evidence ◽  
Flare Model

AbstractHα spectra obtained at Sternberg Astronomical Institute in Moscow during the gradual phase of the flare on May 16, 1981 are analysed. The flare-ribbon profiles show a red asymmetry of the emission peaks, and we interpret this as an absorption in the blue wing of the profile due to expected upflows. We demonstrate a good correlation between the observed Hα profiles and those computed with the flare model Fl and upflows reaching 10 km s−1.

scholarly journals Effective Temperatures of Stars with “Standard” Angular Diameters

1985 ◽  
Vol 111 ◽  
pp. 465-467
Author(s):  
I. N. Glushneva
Keyword(s):  
Effective Temperature ◽  
Astronomical Institute ◽  
Joint Determination ◽  
Sternberg Astronomical Institute ◽  
Effective Temperatures ◽  
Angular Diameters

For 12 stars from the list of stars with “standard” angular diameters (Fracassini et al. 1983), effective temperatures, bolometric corrections, radii and luminosities were determined. These stars are included in the stellar spectrophotometric catalog of the Sternberg Astronomical Institute and three of them were used as spectrophotometric standards. A comparison was made of Teff obtained directly using angular diameters from the list of Fracassini et al. (1983) and by means of joint determination of Teff and θ (Blackwell and Shallis 1977). For 7 stars the differences in Teff values don't exceed 1–1.5% and the maximum discrepancies are about 6% for BS 2294, 2943 and 4% for the spectrophotometric standard α Aql (BS 7557). Effective temperature values of α Lyr obtained by these two methods are in the agreement within 0.5%.

Evidence for gentle chromospheric evaporation during the gradual phase of large solar flares

1987 ◽  
Vol 317 ◽  
pp. 956 ◽  
Author(s):  
B. Schmieder ◽  
T. G. Forbes ◽  
J. M. Malherbe ◽  
M. E. Machado
Keyword(s):  
Solar Flares ◽  
Gradual Phase ◽  
Chromospheric Evaporation

scholarly journals Period Changes and Mass Loss Rates in 34 RS CVn-Type Binaries

1980 ◽  
Vol 88 ◽  
pp. 383-387 ◽  
Author(s):  
Douglas S. Hall ◽  
Jerzy M. Kreiner ◽  
Steven N. Shore
Keyword(s):  
Light Curve ◽  
Mass Loss ◽  
Least Squares ◽  
Weighted Least Squares ◽  
Astronomical Observatory ◽  
Astronomical Institute ◽  
Long Period ◽  
Sternberg Astronomical Institute ◽  
Short Period

We have collected all available times of minimum, over 1650, for 23 regular, 7 short-period, and 4 long-period eclipsing RS CVn binaries using the card catalogues at the Sternberg Astronomical Institute and the Krakow Astronomical Observatory, as well as unpublished data. We examined them critically, discarded those grossly in error, and assigned weights. For AD Cap, RV Lib, and ε UMi there are virtually no data. For the remaining 31 we determined quadratic ephemerides by weighted least squares. Values of d1nP/dt are given in the Table with their errors. Roughly 2/3 are variable at greater than the 2 σ level. Significant decreases outnumber significant increases by almost 2:1. We show that light curve asymmetry produced by the distortion wave probably accounts for the relatively small, rapid fluctuations in the O-C curve but not the long-term period changes.

scholarly journals Sternberg Astronomical Institute Supernova Catalogue, and radial distribution of supernovae in host galaxies

2006 ◽  
Vol 2 (14) ◽  
pp. 316-316 ◽  
Author(s):  
O. S. Bartunov ◽  
D. Yu. Tsvetkov ◽  
N. N. Pavlyuk
Keyword(s):  
Radial Distribution ◽  
Astronomical Institute ◽  
Host Galaxies ◽  
Sternberg Astronomical Institute

AbstractWe present a new version of the Sternberg Astronomical Institite Supernova Catalogue and the results of our investigation of the supernova radial distribution in their host galaxies based on the new data.

Analysis of the optics of the 2.5-m telescope of the Sternberg Astronomical Institute

2017 ◽  
Vol 61 (8) ◽  
pp. 715-725 ◽  
Author(s):  
S. A. Potanin ◽  
I. A. Gorbunov ◽  
A. V. Dodin ◽  
A. D. Savvin ◽  
B. S. Safonov ◽  
...  
Keyword(s):  
Astronomical Institute ◽  
Sternberg Astronomical Institute

scholarly journals Study of Photometric Variability of Selected SU UMa Dwarf Novae

2015 ◽  
Vol 2 (1) ◽  
pp. 161-164
Author(s):  
I. Voloshina ◽  
V. Metlov
Keyword(s):  
Light Curves ◽  
Astronomical Institute ◽  
Dwarf Novae ◽  
Time Resolved ◽  
Photometric Variability ◽  
Sternberg Astronomical Institute ◽  
June July

In this work we present time-resolved photometry of several poorly-studied dwarf novae during recent superoutbursts. Observations were made with a CCD, mounted on 50- and 60-cm telescopes of the Sternberg Astronomical Institute in Crimea in April - May and October 2012 and June - July 2013. Superhumps were detected in light curves of all the dwarf novae. The amplitudes and periods of detected light variations were calculated. Superhumps evolution was also followed up for all systems and classification is improved.

scholarly journals UBV-Observations of Variable Planetary Nebulae

1983 ◽  
Vol 103 ◽  
pp. 532-533
Author(s):  
E.B. Kostyakova
Keyword(s):  
Planetary Nebulae ◽  
Astronomical Institute ◽  
Sternberg Astronomical Institute

The UBV- and spectral observations of several variable planetary nebulae were continued at the Crimean Station of Sternberg Astronomical Institute.

Observational Facilities of Sternberg Astronomical Institute for Ground-Based Photometric Study of Newly Identified GAIA Objects, — CV-candidates.

2017 ◽  
Vol 12 (S330) ◽  
pp. 354-355
Author(s):  
Irina Voloshina ◽  
Valerian Sementsov
Keyword(s):  
Binary Systems ◽  
Cataclysmic Variables ◽  
Ccd Camera ◽  
Close Binary ◽  
Astronomical Institute ◽  
Sternberg Astronomical Institute ◽  
Observational Station ◽  
Good Laboratory ◽  
Observational Program

AbstractThe extended observational program for study of cataclysmic variables is realized in Sternberg Astronomical Institute during the last years. A few telescopes of Crimean Observational Station equipped with a different devices, — UBV photometer and two CCD camera, are used for observations. Among the close binary systems (CBS), cataclysmic variables are the most interesting objects because of the outburst activity and variety of their observational features. They could serve a good laboratory for study of physical processes in CBS. GAIA provides astronomers with a new ample opportunity for investigation of cataclysmic variables. Though the relative faintness of detected objects it is still possible to carry out a high accuracy ground-based observations with our equipment. Obtained ground-based data permit us to confirm classification of detected CV-candidates, to determine the physical characteristics with a sample of new cods and improve the current understanding of their nature.

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