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
Peculiar outburst of the newly revealed variable star V838 Mon
D. Kolev, M. Mikolajewski, T. Tomov +4
We present photometric and high- and low-resolution spectroscopic observations of the unusual outburst of V838 Mon. The data were collected at the NAO Rozhen, Bulgaria and at the T…
The radial velocities and physical parameters of HD 553
R. Duemmler, I. Kh. Iliev, L. Iliev
HD 553 was discovered as an eclipsing binary by Hipparcos. Here, we present the first radial velocity curve for this system. It is found that HD 553 is a double-lined spectroscopic…
The double outburst of the unique object V838 Mon
J. P. Osiwala, M. Mikolajewski, T. Tomov +4
We present spectroscopic and photometric observations of the recent peculiar outburst of V838 Mon, carried out at Rozhen and Torun observatories. Our data cover a period of three m…
PX Andromedae: Superhumps and variable eclipse depth
V. Stanishev, Z. Kraicheva, H. M. J. Boffin +1
Results of a photometric study of the SW Sex novalike PX And are presented. The periodogram analysis of the observations obtained in October 2000 reveals the presence of three sign…
Discovery of New Milky Way Star Clusters Candidates in the 2MASS Point Source Catalog
V. D. Ivanov, J. Borissova, P. Pessev +2
A systematic search of the 2MASS point source catalog, covering 47% of the sky, was carried out aiming to reveal any hidden globular clusters in our Galaxy. Eight new star clusters…
Unveiling the Kinematics and Dynamics of Ionized Gas in the Nearby Irregular Galaxy NGC 4449
Margarita Valdez-Gutierrez, Margarita Rosado, Ivanio Puerari +3
A detailed kinematic analysis of ionized gas in the nearby irregular galaxy NGC 4449 is presented. Observations are conducted in the spectral lines of Halpha and [SII]. Our scannin…
The status of Galactic field lambda Bootis stars in the post-Hipparcos era
Ernst Paunzen, Ilian Kh. Iliev, Inga Kamp +1
The lambda Bootis stars are Population I, late B to early F-type stars, with moderate to extreme (up to a factor 100) surface underabundances of most Fe-peak elements and solar abu…
On the Origin of the Circular and Hexagonal Formations in Galaxies
Yuri N. Efremov
The round and arc-shaped formations are known in some galaxies, the Bubble complex (the Hodge object) in NGC 6946 being the most remarkable. The rim of the complex has a form of a…
Properties of the PCygni wind found using the Self Absorption Curve method
G. Muratorio, N. Markova, M. Friedjung +1
We have used the optical lines of N II and Fe III to study the wind of the luminous blue variable P Cyg. This was performed by applying a version of the Self Absorption Curve (SAC)…
Red Giant Branch Stars as Probes of Stellar Populations I: 2MASS Calibration and Application to 2MASS GC01
Valentin D. Ivanov, Jordanka Borissova
The near-infrared behavior of the red giant branch (RGB hereafter) as a function of abundance is examined with an unprecedented large sample of 27 Galactic globular clusters with T…
M75, a Globular Cluster with a Trimodal Horizontal Branch. I. Color-Magnitude Diagram
M. Catelan, J. Borissova, F. R. Ferraro +3
Deep UBVI photometry for a large field covering the distant globular cluster M75 (NGC 6864) is presented. We confirm a previous suggestion (Catelan et al. 1998a) that M75 possesses…