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
15 papers · 2 filters
Low-resolution optical spectra of ultracool dwarfs with OSIRIS/GTC
Yanina Metodieva, Antoaneta Antonova, Valeri Golev +3
We present the results of low-resolution optical spectroscopy with OSIRIS/GTC (Optical System for Imaging and Low Resolution Integrated Spectroscopy / Gran Telescopio Canarias) for…
Orbital parameters of the high-mass X-ray binary 4U 2206+54
K. A. Stoyanov, R. K. Zamanov, G. Y. Latev +2
We present new radial velocities of the high-mass X-ray binary star 4U 2206+54 based on optical spectra obtained with the Coude spectrograph at the 2m RCC telescope at the Rozhen N…
The Magnetic Fields at the Surface of Active Single G-K Giants
M. Aurière, R. Konstantinova-Antova, C. Charbonnel +15
We investigate the magnetic field at the surface of 48 red giants selected as promising for detection of Stokes V Zeeman signatures in their spectral lines. We use the spectropolar…
Physics of mass loss in massive stars
J. Puls, J. O. Sundqvist, N. Markova
We review potential mass-loss mechanisms in the various evolutionary stages of massive stars, from the well-known line-driven winds of O-stars and BA-supergiants to the less-unders…
Rotational velocities of single and binary O-type stars in the Tarantula Nebula
O. H. Ramírez-Agudelo, H. Sana, A. de Koter +15
Rotation is a key parameter in the evolution of massive stars, affecting their evolution, chemical yields, ionizing photon budget, and final fate. We determined the projected rotat…
Rotation of the Mass Donors in High-mass X-ray Binaries and Symbiotic Stars
Kiril Stoyanov, Radoslav Zamanov
Our aim is to investigate the tidal interaction in High-mass X-ray Binaries and Symbiotic stars in order to determine in which objects the rotation of the mass donors is synchroniz…
The first Delta a observations of three globular clusters
E. Paunzen, I. Kh. Iliev, O. I. Pintado +6
Globular clusters are main astrophysical laboratories to test and modify evolutionary models. Thought to be rather homogeneous in their local elemental Distribution of members, res…
Investigating the possible connection between lambda Bootis stars and intermediate Population II type stars
E. Paunzen, I. Kh. Iliev, L. Fossati +2
The lambda Bootis (LB) stars are located at the upper main sequence of the H-R diagram and exhibit a peculiar abundance pattern. The light elements (C, N, O, and S) present solar a…
Hα spectroscopy and multiwavelength imaging of a solar flare caused by filament eruption
Z. Huang, M. S. Madjarska, K. Koleva +4
We study a sequence of eruptive events including filament eruption, a GOES C4.3 flare and a coronal mass ejection. We aim to identify the possible trigger(s) and precursor(s) of th…
Transit Timing Analysis in the HAT-P-32 system
M. Seeliger, D. Dimitrov, D. Kjurkchieva +24
We present the results of 45 transit observations obtained for the transiting exoplanet HAT-P-32b. The transits have been observed using several telescopes mainly throughout the YE…
A long-term UBVRI photometric study of the pre-main sequence star V350 Cep
Sunay Ibryamov, Evgeni Semkov, Stoyanka Peneva
Results from UBVRI optical photometric observations of the pre-main sequence star V350 Cep during the period 2004-2014 are presented. The star was discovered in 1977 due to its rem…
The Clusters AgeS Experiment (CASE). VI. Analysis of two detached eclipsing binaries in the Globular Cluster M55
J. Kaluzny, I. B. Thompson, A. Dotter +4
We present an analysis of the detached eclipsing binaries V44 and V54 belonging to the globular cluster M55. For V54 we obtain the following absolute parameters: $M_p=0.726\pm 0.01…
Investigation of a transiting planet candidate in Trumpler 37: an astrophysical false positive eclipsing spectroscopic binary star
R. Errmann, G. Torres, T. O. B. Schmidt +50
We report our investigation of the first transiting planet candidate from the YETI project in the young (~4 Myr old) open cluster Trumpler 37. The transit-like signal detected in t…
The VLT-FLAMES Tarantula Survey XIV. The O-Type Stellar Content of 30 Doradus
N. R. Walborn, H. Sana, S. Simon-Diaz +6
Detailed spectral classifications are presented for 352 O-B0 stars in the VLT-FLAMES Tarantula Survey, of which 213 O-type are of sufficient quality for further morphological analy…
Frequency and spectrum analysis of Doradus type Kepler target KIC 6462033
C. Ulusoy, I. Stateva, I. Kh. Iliev +1
We present results of an asteroseismic study on the Dor type {\it Kepler} target KIC\,6462033. {\it Kepler} photometry is used to derive the frequency content and principal mod…