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
14 papers · 2 filters
HD 210111: a new lambda Bootis type SB system
E. Paunzen, U. Heiter, L. Fraga +1
The small group of lambda Bootis stars comprises late B to early F-type stars, with moderate to extreme (up to a factor 100) surface underabundances of most Fe-peak elements and so…
The VLT-FLAMES Tarantula Survey: The fastest rotating O-type star and shortest period LMC pulsar - remnants of a supernova disrupted binary?
P. L. Dufton, P. R. Dunstall, C. J. Evans +12
We present a spectroscopic analysis of an extremely rapidly rotating late O-type star, VFTS102, observed during a spectroscopic survey of 30 Doradus. VFTS102 has a projected rotati…
Bayesian approach to cyclic activity of CF Oct
Ana P. Borisova, Valeri V. Hambaryan, John L. Innis
Bayesian statistical methods of Gregory-Loredo and the Bretthorst generalization of the Lomb-Scargle periodogram have been applied for studying activity cycles of the early K-type…
Optical photometry of GM Cep: evidence for UXor type of variability
E. H. Semkov, S. P. Peneva
Results from optical photometric observations of the pre-main sequence star GM Cep are reported in the paper. The star is located in the field of the young open cluster Trumpler 37…
Abundance analysis of Am binaries and search for tidally driven abundance anomalies - III. HD116657, HD138213, HD155375, HD159560, HD196544 and HD204188
I. Stateva, I. Kh. Iliev, J. Budaj
We continue here the systematic abundance analysis of a sample of Am binaries in order to search for possible abundance anomalies driven by tidal interaction in these binary system…
Magnetic field and convection in the cool supergiant Betelgeuse
P. Petit, M. Aurière, R. Konstantinova-Antova +4
We present the outcome of a highly-sensitive search for magnetic fields on the cool supergiant Betelgeuse. A time-series of six circularly-polarized spectra was obtained using the…
A dominant magnetic dipole for the evolved Ap star candidate EK Eridani
M. Auriere, R. Konstantinova-Antova, P. Petit +8
EK Eri is one of the most slowly rotating active giants known, and has been proposed to be the descendant of a strongly magnetic Ap star. We have performed a spectropolarimetric st…
Direct observation of magnetic cycles in Sun-like stars
A. Morgenthaler, P. Petit, J. Morin +4
A sample of 19 solar-type stars, probing masses between 0.6 and 1.4 solar mass and rotation periods between 3.4 and 43 days, was regularly observed using the NARVAL spectropolarime…
Multi-Wavelength Study of the 2008-2009 Outburst of V1647 Ori
D. Garcia-Alvarez, N. J. Wright, J. J. Drake +11
V1647 Ori is a young eruptive variable star, illuminating a reflection nebula (McNeil's Nebula). It underwent an outburst in 2003 before fading back to its pre-outburst brightness…
Young Exoplanet Transit Initiative (YETI)
R. Neuhäuser, R. Errmann, A. Berndt +80
We present the Young Exoplanet Transit Initiative (YETI), in which we use several 0.2 to 2.6m telescopes around the world to monitor continuously young (< 100 Myr), nearby (< 1 kpc…
2MASS J01074282+4845188: a new nova-like cataclysmic star with a deep eclipse
Dinko Dimitrov, Diana Kjurkchieva
We present VRI photometry and low-resolution spectroscopy of the object 2MASS J01074282+4845188. The V-shape of the eclipse, the phase variability of the colour indices as well as…
Multi-site, multi-year monitoring of the oscillating Algol-type eclipsing binary CT Her
P. Lampens, A. Strigachev, S. -L. Kim +13
We present the results of a multi-site photometric campaign carried out in 2004-2008 for the Algol-type eclipsing binary system CT Her, the primary component of which shows Delta S…
The VLT-FLAMES Tarantula Survey II: R139 revealed as a massive binary system
W. D. Taylor, C. J. Evans, H. Sana +22
We report the discovery that R139 in 30 Doradus is a massive spectroscopic binary system. Multi-epoch optical spectroscopy of R139 was obtained as part of the VLT-FLAMES Tarantula…
The H-alpha Variations of the Luminous Blue Variable P Cygni: Discrete Absorption Components and the Short S Doradus Phase
Noel D. Richardson, Nancy D. Morrison, Douglas R. Gies +3
P Cygni is a prototype of the Luminous Blue Variables (or S Doradus variables), and the star displays photometric and emission line variability on a timescale of years (known as th…