902 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Bulgarian Academy of SciencesBG224 papers
- Centre National de la Recherche ScientifiqueFR67 papers
- Sofia University "St. Kliment Ohridski"BG64 papers
- Shumen UniversityBG62 papers
- Instituto de Astrofísica de CanariasES57 papers
- Instituto de Astrofísica de AndalucíaES55 papers
- National Institute for AstrophysicsIT54 papers
- Universidad de La LagunaES50 papers
- Astronomical ObservatoryRS48 papers
- Evgeni Kharadze Georgian National Astrophysical ObservatoryGE45 papers
- Aryabhatta Research Institute of Observational SciencesIN43 papers
- Osservatorio Astrofisico di TorinoIT43 papers
25 papers · 1 filter
Optical observations of the nearby galaxy IC342 with narrow band [SII] and H filters. I
M. M. Vucetic, B. Arbutina, D. Urosevic +4
We present observations of the portion of the nearby spiral galaxy IC342 using narrow band [SII] and H filters. These observations were carried out in November 2011 with the 2m…
Connection between orbital modulation of H-alpha and gamma-rays in the Be/X-ray binary LSI+61303
R. Zamanov, J. Martí, K. Stoyanov +2
We studied the average orbital modulation of various parameters (gamma-ray flux, H-alpha emission line, optical V band brightness) of the radio- and gamma-ray emitting Be/X-ray bin…
A Bcool magnetic snapshot survey of solar-type stars
S. C. Marsden, P. Petit, S. V. Jeffers +20
Stellar magnetic field measurements obtained from spectropolarimetry offer key data for activity and dynamo studies, and we present the results of a major high-resolution spectropo…
Spectroscopic and physical parameters of Galactic O-type stars. II. Observational constraints on projected rotational and extra broadening velocities as a function of fundamental parameters and stellar evolution
N. Markova, J. Puls, S. Simón-Díaz +3
Rotation is of key importance for the evolution of hot massive stars, however, the rotational velocities of these stars are difficult to determine. Based on our own data for 31 Gal…
Magnetic Field Structure and Activity of the He-burning Giant 37 Comae
S. Tsvetkova, P. Petit, R. Konstantinova-Antova +4
We present the first magnetic map of the late-type giant 37 Com. The Least Squares Deconvolution (LSD) method and Zeeman Doppler Imaging (ZDI) inversion technique were applied. The…
Pollux: a stable weak dipolar magnetic field but no planet ?
Michel Auriere, Renada Konstantinova-Antova, Olivier Espagnet +5
Pollux is considered as an archetype of a giant star hosting a planet: its radial velocity (RV) presents sinusoidal variations with a period of about 590 d, which have been stable…
The rotation rates of massive stars: How slow are the slow ones?
J. O. Sundqvist, S. Simon-Diaz, J. Puls +1
Context: Rotation plays a key role in the life cycles of stars with masses above 8 Msun. Hence, accurate knowledge of the rotation rates of such massive stars is critical for under…
The 72-Hour WEBT Microvariability Observation of Blazar S5 0716+714 in 2009
G. Bhatta, J. R. Webb, H. Hollingsworth +42
Context. The international whole earth blazar telescope (WEBT) consortium planned and carried out three days of intensive micro-variability observations of S5 0716+714 from Februar…
Search for surface magnetic fields in Mira stars. First detection in chi Cyg
A. Lèbre, M. Aurière, N. Fabas +4
In order to complete the knowledge of the magnetic field and of its influence during the transition from Asymptotic Giant Branch to Planetary Nebulae stages, we have undertaken a s…
Constraints on a second planet in the WASP-3 system
G. Maciejewski, A. Niedzielski, A. Wolszczan +30
There have been previous hints that the transiting planet WASP-3 b is accompanied by a second planet in a nearby orbit, based on small deviations from strict periodicity of the obs…
H-alpha observations of the gamma-ray-emitting Be/X-ray binary LSI+61303: orbital modulation, disk truncation, and long-term variability
R. Zamanov, K. Stoyanov, J. Marti +4
We report 138 spectral observations of the H-alpha emission line of the radio- and gamma-ray-emitting Be/X-ray binary LSI+61303 obtained during the period of September 1998 -- Janu…
Seismic investigation of the γ Dor star KIC 6462033: The first results of Kepler and ground-based follow up observations
C. Ulusoy, B. Ulaş, M. Damasso +5
We present the first preliminary results on the analysis of ground-based time series of the γ Dor star KIC 6462033 (TYC 3144-646-1, V = 10.83, P = 0.69686 d) as well as Kepler phot…
The awakening of BL Lacertae: observations by Fermi, Swift, and the GASP-WEBT
C. M. Raiteri, M. Villata, F. D'Ammando +4
Since the launch of the Fermi satellite, BL Lacertae has been moderately active at gamma-rays and optical frequencies until May 2011, when the source started a series of strong fla…
The (non-)variability of magnetic chemically peculiar candidates in the Large Magellanic Cloud
E. Paunzen, Z. Mikulasek, R. Poleski +3
The galactic magnetic chemically peculiar (mCP) stars of the upper main sequence are well known as periodic spectral and light variables. The observed variability is obviously caus…
Towards a photometric metallicity scale for open clusters
M. Netopil, E. Paunzen
Open clusters are a useful tool when investigating several topics connected with stellar evolution; for example the age or distance can be more accurately determined than for field…
Photometric and spectroscopic variability of the FUor star V582 Aurigae
E. H. Semkov, S. P. Peneva, U. Munari +5
We carried out BVRI CCD photometric observations in the field of V582 Aur from 2009 August to 2013 February. We acquired high-, medium-, and low-resolution spectroscopy of V582 Aur…
The stellar content of the young open cluster Trumpler 37
R. Errmann, R. Neuhäuser, L. Marschall +21
With an apparent cluster diameter of 1.5° and an age of ~4 Myr, Trumpler 37 is an ideal target for photometric monitoring of young stars as well as for the search of planetary tran…
Multi-site photometric campaign on the high amplitude δ Scuti star KIC 6382916
C. Ulusoy, B. Ulaş, T. Gülmez +15
We present results of a multi-site photometric campaign on the high-amplitude \,Scuti star KIC\,6382916 in the {\it Kepler} field. The star was observed over a 85-d interval at…
New approach for modeling of transiting exoplanets for arbitrary limb-darkening law
D. Kjurkchieva, D. Dimitrov, A. Vladev +1
We present a new solution of the direct problem of planet transits based on transformation of double integrals to single ones. On the basis of our direct problem solution we create…
The SW Sex-type star 2MASS J01074282+4845188: an unusual bright accretion disk with non-steady emission and a hot white dwarf
T. Khruzina, D. Dimitrov, D. Kjurkchieva
We present new photometric and spectral observations of the newly discovered nova-like eclipsing star 2MASS J01074282+4845188. To obtain a light curve solution we used model of a n…
Lepton Asymmetry and Neutrino Oscillations Interplay
Daniela Kirilova
We discuss the interplay between lepton asymmetry L and neutrino oscillations in the early Universe. Neutrino oscillations may suppress or enhance previously existing L. On the oth…
Long-term spectropolarimetric monitoring of the cool supergiant Betelgeuse
I. Bedecarrax, P. Petit, M. Aurière +6
We report on a long-term monitoring of the cool supergiant Betelgeuse, using the NARVAL and ESPaDOnS high-resolution spectropolarimeters, respectively installed at Telescope Bernar…
Multi-site campaign for transit timing variations of WASP-12 b: possible detection of a long-period signal of planetary origin
G. Maciejewski, D. Dimitrov, M. Seeliger +38
The transiting planet WASP-12 b was identified as a potential target for transit timing studies because a departure from a linear ephemeris was reported in the literature. Such dev…
Symbiotic Stars with Similar Line Profiles during Activity
N. A. Tomov, M. T. Tomova, D. V. Bisikalo
Line profiles containing indication of bipolar collimated outflow along with P Cyg absorption during phase of activity of several symbiotic systems are considered. The Hgamma profi…