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
86 papers · 1 filter
The WEBT Campaign on the Intermediate BL Lac Object 3C66A in 2007-2008
M. Boettcher, K. Fultz
Prompted by a high optical state in September 2007, the Whole Earth Blazar Telescope (WEBT) consortium organized an intensive optical, near-IR (JHK) and radio observing campaign on…
A new activity phase of the blazar 3C 454.3. Multifrequency observations by the WEBT and XMM-Newton in 2007-2008
C. M. Raiteri, M. Villata, V. M. Larionov +2
We present and analyse the WEBT multifrequency observations of 3C 454.3 in the 2007-2008 observing season, including XMM-Newton observations and near-IR spectroscopic monitoring, a…
EK Eridani: the tip of the iceberg of giants which have evolved from magnetic Ap stars
M. Aurière, R. Konstantinova-Antova, P. Petit +8
We observe the slowly-rotating, active, single giant, EK Eri, to study and infer the nature of its magnetic field directly. We used the spectropolarimeter NARVAL at the Telescope B…
BV photometry of a possible open star cluster pair NGC 7031/NGC 7086
Valentin Kopchev, Georgy Petrov
We present a CCD BV photometry of the possible binary open star cluster NGC 7031/NGC 7086. The aim is to confirm or disprove their common nature on the grounds of their age and dis…
Rotational velocities of the giants in symbiotic stars: III. Evidence of fast rotation in S-type symbiotics
R. K. Zamanov, M. F. Bode, C. H. F. Melo +5
We have measured the projected rotational velocities (vsini) in a number of symbiotic stars and M giants using high resolution spectroscopic observations. On the basis of our measu…
Wind structure of late B supergiants I. Multi-line analyses of near-surface and wind structure in HD 199 478 (B8 Iae)
N. Markova, R. Prinja, H. Markov +4
We provide a quantitative analysis of time-variable phenomena in the photospheric, near-star, and outflow regions of the late-B supergiant (SG) HD 199478. The analysis is based pri…
The high activity of 3C 454.3 in autumn 2007. Monitoring by the WEBT during the AGILE detection
C. M. Raiteri, M. Villata, W. P. Chen +5
The quasar-type blazar 3C 454.3 underwent a phase of high activity in summer and autumn 2007, which was intensively monitored in the radio-to-optical bands by the Whole Earth Blaza…
The orbital and physical parameters of the eclipsing binary OW Gemiorum
C. Gałan, M. Mikołajewski, T. Tomov +5
We present our multicolour photometric data of the primary and secondary eclipses of OW Gem that took place in 1995, 2002, and 2006, as well as the new radial-velocity data collect…
Optical monitoring of the z=4.40 quasar Q 2203+292
E. P. Ovcharov, P. L. Nedialkov, A. T. Valcheva +5
We report Cousins R-band monitoring of the high-redshift (z=4.40) radio quiet quasar Q 2203+292 from May 1999 to October 2007. The quasar shows maximum peak-to-peak light curve amp…
Radio-to-UV monitoring of AO 0235+164 by the WEBT and Swift during the 2006--2007 outburst
C. M. Raiteri, M. Villata, V. M. Larionov +2
The blazar AO 0235+164 was claimed to show a quasi-periodic behaviour in the radio and optical bands. Moreover, an extra emission component contributing to the UV and soft X-ray fl…
Bright OB stars in the Galaxy IV. Stellar and wind parameters of early to late B supergiants
N. Markova, J. Puls
We apply the NLTE atmosphere code FASTWIND to perform a spectroscopic study of a small sample of Galactic B-supergiants from B0 to B9. By means of the resulting data and incorporat…
Johnson-Cousins magnitudes of comparison stars in the fields of ten Seyfert galaxies
B. M. Mihov, L. S. Slavcheva-Mihova
We present UBVRcIc magnitudes of 49 comparison stars in the fields of the Seyfert galaxies Mrk 335, Mrk 79, Mrk 279, Mrk 506, 3C 382, 3C 390.3, NGC 6814, Mrk 304, Ark 564, and NGC…
The WEBT Campaign on the Blazar 3C279 in 2006
M. Boettcher
The quasar 3C279 was the target of an extensive multiwavelength monitoring campaign from January through April 2006, including an optical-IR-radio monitoring campaign by the Whole…
Recent photometry of symbiotic stars - XII
A. Skopal, M. Vanko, T. Pribulla +4
We present new photometric observations of 15 symbiotic stars (EG And, Z And, AE Ara, BF Cyg, CH Cyg, CI Cyg, V1329 Cyg, TX CVn, AG Dra, Draco C-1, RW Hya, SY Mus, AR Pav, AG Peg,…
Photometric monitoring of the blazar 3C 345 for the period 1996 - 2006
B. Mihov, R. Bachev, L. Slavcheva-Mihova +3
We present the results of the blazar 3C 345 monitoring in Johnson-Cousins BVRI bands for the period 1996 - 2006. We have collected 29 V and 43 R data points for this period; the BI…
Search for pulsation among suspected A-type binaries and the new multiperiodic Delta Scuti star HD217860
Yves Fremat, P. Lampens, P. Van Cauteren +9
We have explored a sample of suspected A-type binaries in a systematic way, both spectroscopically and photometrically. Due to their location in the H-R diagram, indications of pul…
CIV 1549 as an Eigenvector 1 Parameter for Active Galactic Nuclei
Jack W. Sulentic, Rumen Bachev, Paola Marziani +2
[Abridged] We have been exploring a spectroscopic unification for all known types of broad line emitting AGN. The 4D Eigenvector 1 (4DE1) parameter space shows promise as a unifica…
The Early Spectrophotometric Evolution of V1186 Scorpii (Nova Scorpii 2004 #1)
G. J. Schwarz, C. E. Woodward, M. F. Bode +19
We report optical photometry and optical through mid-infrared spectroscopy of the classical nova V1186 Sco. This slowly developing nova had an complex light curve with multiple sec…
Multiband optical surface brightness profile decompositions of the Seyfert galaxies Mrk 79 and NGC 5548
Boyko Mihov, Lyuba Slavcheva-Mihova
We present preliminary results of the Johnson-Cousins (U)BVRI surface brightness profile decompositions of the Seyfert galaxies Mrk 79 and NGC 5548. The profiles were modelled as a…
Dynamical modeling of the Deep Impact dust ejecta cloud
Tanyu Bonev, Nancy Ageorges, Stefano Bagnulo +17
The collision of Deep Impact with comet 9P/Tempel 1 generated a bright cloud of dust which dissipated during several days after the impact. The brightness variations of this cloud…
Bipolar ejection by the symbiotic binary system Z And during its 2006 outburst
N. A. Tomov, M. T. Tomova, D. V. Bisikalo
High resolution data in the region of the line Halpha have been obtained at the time of the light maximum and after it of the 2006 optical outburst of the symbiotic binary Z And. A…
Multicolour CCD Measurements of Visual Double and Multiple Stars. III
P. Lampens, A. Strigachev, D. Duval
Recent CCD observations were performed in the period 1998-2004 for a large sample of visual double and multiple stars selected from the Hipparcos Catalogue and/or from the Gliese C…
CCD photometric search for peculiar stars in open clusters. VIII. King 21, NGC 3293, NGC 5999, NGC 6802, NGC 6830, Ruprecht 44, Ruprecht 115, and Ruprecht 120
M. Netopil, E. Paunzen, H. M. Maitzen +5
We continue our survey for magnetic chemically peculiar (CP2) stars in galactic open clusters to shed more light on their origin and evolution. To study the group of CP2 stars, it…
A Study of an Outburst in the Classical Symbiotic Star Z And in a Colliding-Wind Model
D. V. Bisikalo, A. A. Boyarchuk, E. Yu. Kilpio +2
Two-dimensional gas-dynamical modeling of the mass-flow structure is used to study the outburst development in the classical symbiotic star Z And. The stage-by-stage rise of the li…