36 citations · 67 across the 14 of their papers we have counts for
7 papers · 1 filter
On the relationship between the ellipticity of Galactic globular clusters and their X-ray luminosity
Georgi P. Petrov, Svetoslav Botev, Antoniya Valcheva +1
We examine the dependence of the ellipticity of globular clusters in the Milky Way on their X-ray luminosity using two modern catalogs and combine them with optical and X-ray data…
Structural Parameters of the Globular Cluster M 15
M. V. Petkova, G. P. Petrov, N. M. Kacharov +1
We present a detailed analysis of the structural parameters of the globular cluster M 15 using g- and i-band photometric data from Pan-STARRS1 DR2. The central coordinates ($X_{\rm…
Quasars behind the disk of M31 galaxy
P. Nedialkov, B. F. Williams, V. D. Ivanov +6
We aim to increase the limited number of quasars behind M31, necessary for probing the chemical content of the gas and for proper motion reference, with reliable and homogeneous re…
Periodic variability of the z=2.0 quasar QSO B1312+7837
M. Minev, V. D. Ivanov, T. Trifonov +6
We report here the first results from a 15-yr long variability monitoring of the z=2.0 quasar QSO B1312+7837. It shows luminosity changes with a period P~6.13 yr (P~2.04 yr at rest…
Search for the brightest stars in galaxies outside the Local Group
N. A. Tikhonov, O. A. Galazutdinova, O. N. Sholukhova +3
This paper shows a technique for searching for bright massive stars in galaxies beyond the Local Group. To search for massive stars, we used the results of stellar photometry of th…
Young stellar groups in M 33 galaxy: delineation and main parameters
Luba Vassileva, Todor Veltchev, Tsvetan Georgiev +1
The problem of (non-)existence of a typical size of the stellar associations is revisited by use of deep UBVRI stellar CCD photometry in M 33 from the Local Group Survey (Massey et…