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Aug 22, 2016

Photometric and spectroscopic study of the new FUor star V2493 Cyg

The recent results from photometric and spectroscopic study of the FUor star V2493 Cyg (HBC 722) are presented in the paper. The outburst of V2493 Cy…
Oct 31, 2013

Spectroscopic and physical parameters of Galactic O-type stars. II. …

Rotation is of key importance for the evolution of hot massive stars, however, the rotational velocities of these stars are difficult to determine. B…
Dec 08, 2016

Magnetic field structure in single late-type giants: The weak G-band …

This work studies the magnetic activity of the late-type giant 37 Com. This star belongs to the group of weak G-band stars that present very strong c…
Jun 14, 2019

High-resolution optical spectroscopy of Nova V392 Per

Here we analyze high-resolution spectra of the Nova V392 Per obtained during the 2018 outburst. The H$\alpha$ and H$\beta$ emission lines show a trip…
May 03, 2010

GSC 2314-0530: the shortest-period eclipsing system with dMe componen…

CCD photometric observations in VRI colors and spectroscopic observations of the newly discovered eclipsing binary GSC 2314-0530 (NSVS 6550671) with …
Feb 08, 2010

We present results of high-resolution observations of the Balmer lines Hα and Hγ as well as the line He ii λ 4686 of the symbiotic binary Z And during the rise of the light of its small-amplitude brightening at the end of 2002. The width of the Balm…

The hydrogen and helium lines of the symbiotic binary Z And during it…

High resolution observations in the region of the lines Halpha, He II 4686 and Hgamma of the spectrum of the symbiotic binary Z And were performed du…
Sep 29, 2014

Long-term BVRI light curves of 5 pre-main sequence stars in the field…

We present new data from BVRI photometric observations of five PMS stars during the period from April 2013 to July 2014. The stars are located in the…
May 18, 2009

Dust properties of nearby disks: M31 case

Several properties of the M31 disk, namely: opacity, extinction law and gas-to-dust ratio are studied by means of optical and near-infrared photometr…
Apr 21, 2015

Violent intra-night optical variability of the blazar S4 0954+65 duri…

In this letter we present results from intra-night monitoring in three colors (BRI) of the blazar S4 0954+65 during its recent (2015 February) unprec…
Jun 05, 2008

Wind structure of late B supergiants I. Multi-line analyses of near…

We provide a quantitative analysis of time-variable phenomena in the photospheric, near-star, and outflow regions of the late-B supergiant (SG) HD 19…
May 26, 2010

The magnetic field of Betelgeuse: a local dynamo from giant convectio…

Betelgeuse is an M supergiant with a complex and extended atmosphere, which also harbors spots and giant granules at its surface. A possible magnetic…
Aug 25, 2015

Transient accretion disc-like envelope in the symbiotic binary BF Cyg…

The optical light of the symbiotic binary BF Cygni during its last eruption after 2006 shows orbital variations because of an eclipse of the outburst…
Mar 07, 2013

The SW Sex-type star 2MASS J01074282+4845188: an unusual bright acc…

We present new photometric and spectral observations of the newly discovered nova-like eclipsing star 2MASS J01074282+4845188. To obtain a light curv…
Oct 21, 2013

The unusual photometric behavior of the new FUor star V2493 Cyg (HBC …

The recent results from photometric study of the new FUor star found in the field of NGC 7000/IC 5070 are presented in the paper. The outburst of V24…
Mar 09, 2018

Spectroscopic and physical parameters of Galactic O-type stars. III. …

Massive stars play a key role in the evolution of the Universe. Our goal is to compare observed and predicted properties of single Galactic O stars t…
Jun 04, 2017

A deep decrease event in the brightness of the PMS star V350 Cep

New photometric data from CCD UBVRI observations of the PMS star V350 Cep during the period from March 2014 to May 2017 are presented. In the period …
Jan 21, 2015

Ultrashort-period MS eclipsing systems. New observations and light cu…

We carried out photometric and low-resolution spectral observations of six eclipsing ultrashort-period binaries with MS components. The light curve s…
Mar 22, 2012

Magnetic Field and Activity of the Single Late-type Giant Beta Ceti

We present the behavior of the magnetic field and activity indicators of the single late-type giant Beta Ceti in the period June 19, 2010 - December …
Apr 26, 2016

The different origins of magnetic fields and activity in the Hertzspr…

Context: When crossing the Hertzsprung gap, intermediate-mass stars develop a convective envelope. Fast rotators on the main sequence, or Ap star des…
Mar 19, 2010

A long-term photometric study of the FU Orionis star V 733 Cep

The FU Orionis candidate V733 Cep was discovered by Roger Persson in 2004. The star is located in the dark cloud L1216 close to the Cepheus OB3 assoc…
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