21 citations · 59 across the 6 of their papers we have counts for
8 papers · 1 filter
Bimodal abundance pattern in M51: evidence for corotation resonance effects
I. A. Acharova, O. A. Galazutdinova, J. R. D. Lépine +2
A chemical evolution model for the bimodal-like abundance distribution in the external galaxy M51 recently derived on the basis of HST data for more than a half million red supergi…
VV124 (UGC4879): A new transitional dwarf galaxy in the periphery of the Local Group
Alexander I. Kopylov, Nikolay A. Tikhonov, Sergey Fabrika +2
We present the first resolved-star photometry of VV124 (UGC4879) and find that this is the most isolated dwarf galaxy in the periphery of the Local Group. Based on imaging and spec…
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…
Stellar Structure of Irregular Galaxies. Edge-On Galaxies
N. A. Tikhonov
Stellar photometry obtained using the Hubble Space Telescope is used to study the distributions of the number densities of stars of various ages in 12 irregular and dwarf spiral ga…
Stellar Structure of Irregular Galaxies. I. Face-on Galaxies
N. A. Tikhonov
Stellar photometry of nearby irregular galaxies of the Local Group is used to identify and study the young and old stellar populations of these galaxies. An analysis of the spatial…
Stellar halos and thick disks around edge-on spiral galaxies IC2233, IC5052, NGC4631 and NGC5023
N. A. Tikhonov, O. A. Galazutdinova, I. O. Drozdovsky
Aims. The extraplanar stellar populations of highly-inclined disk galaxies IC 2233, IC 5052, NGC 4631 and NGC 5023 are analyzed with the goal to quantify their vertical extent and…