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
11 papers · 1 filter
Optical Observations of M81 Galaxy Group in Narrow Band [SII] and H_alpha Filters: Holmberg IX
B. Arbutina, D. Ilic, K. Stavrev +3
We present observations of the nearby tidal dwarf galaxy Holmberg IX in M81 galaxy group in narrow band [SII] and H filters, carried out in March and November 2008 with the 2m R…
Orbital eccentricity of the symbiotic star MWC 560
R. K. Zamanov, A. Gomboc, K. A. Stoyanov +1
We present projected rotational velocity measurements of the red giant in the symbiotic star MWC 560 (V694 Mon), using the high-resolution spectroscopic observations with the FEROS…
A polarity reversal in the large-scale magnetic field of the rapidly rotating Sun HD 190771
P. Petit, B. Dintrans, A. Morgenthaler +5
Aims. We investigate the long-term evolution of the large-scale photospheric magnetic field geometry of the solar-type star HD 190771. With fundamental parameters very close to tho…
The open cluster Berkeley 53
G. Maciejewski, B. Mihov, Ts. Georgiev
We present a photometric study of the neglected open cluster Berkeley 53. We derived its fundamental parameters, such as the age, the interstellar reddening, and the distance from…
The GASP-WEBT monitoring of 3C 454.3 during the 2008 optical-to-radio and gamma-ray outburst
M. Villata, C. M. Raiteri, M. A. Gurwell +6
Since 2001, the radio quasar 3C 454.3 has undergone a period of high optical activity, culminating in the brightest optical state ever observed, during the 2004-2005 outburst. The…
Discovery of a weak magnetic field in the photosphere of the single giant Pollux
M. Auriere, G. A. Wade, R. Konstantinova-Antova +11
Aims: We observe the nearby, weakly-active single giant, Pollux, in order to directly study and infer the nature of its magnetic field. Methods: We used the new generation spectrop…
Lithium and magnetic fields in giants. HD 232862 : a magnetic and lithium-rich giant star
A. Lèbre, A. Palacios, J. D. do Nascimento +5
We report the detection of an unusually high lithium content in HD 232862, a field giant classified as a G8II star, and hosting a magnetic field. With the spectropolarimeters ESPaD…
Studying X-ray reprocessing and continuum variability in quasars: PG 1211+143
R. Bachev, D. Grupe, S. Boeva +5
We present the results from a monitoring campaign of the Narrow-Line Seyfert~1 galaxy PG 1211+143. The object was monitored with ground-based facilities (UBVRI photometry; from Feb…
The evolution of early and late type galaxies in the COSMOS up to z~1.2
Maurilio Pannella, Armin Gabasch, Yuliana Goranova +6
The Cosmic Evolution Survey (COSMOS) allows for the first time a highly significant census of environments and structures up to redshift one, as well as a full morphological descri…
Tidal Interaction in High Mass X-ray Binaries
K. A. Stoyanov, R. K. Zamanov
Our aim is to investigate tidal interaction in High-Mass X-ray Binary stars in order to determine in which objects the rotation of the mass donors is synchronized or pseudosynchron…
Dynamo-generated magnetic fields in fast rotating single giants
Renada Konstantinova-Antova, Michel Aurière, Klaus-Peter Schröder +1
Red giants offer a good opportunity to study the interplay of magnetic fields and stellar evolution. Using the spectro-polarimeter NARVAL of the Telescope Bernard Lyot (TBL), Pic d…