201 citations · 337 across the 9 of their papers we have counts for
9 papers
Young Stellar Complexes in the Giant Galaxy UGC 11973
A. S. Gusev, F. Kh. Sakhibov, O. V. Ezhkova
We present results of the analysis of photometric and spectroscopic observations of the young stellar complexes in the late giant spiral galaxy UGC 11973. Photometric analysis in t…
A spectral and photometric study of 102 star forming regions in seven spiral galaxies
A. S. Gusev, F. Sakhibov, A. E. Piskunov +7
We present a study of complexes of young massive star clusters (YMCs), embedded in extragalactic giant HII regions, based on the coupling of spectroscopic with photometric and spec…
Study of young stellar groupings in HII regions based on the spectral and photometric data
A. S. Gusev, F. Kh. Sakhibov, A. E. Piskunov +10
We studied 102 star forming regions in seven spiral galaxies (NGC 628, NGC 783, NGC 2336, NGC 6217, NGC 6946, NGC 7331, and NGC 7678) on the basis of complex spectroscopic, photome…
Studies of the stellar populations of galaxies using two-color diagrams
Alexander S. Gusev, Svetlana A. Guslyakova, Alexandra P. Novikova +3
Variations in the photometric parameters of stellar systems as a function of their evolution and the stellar populations comprising them are investigated. A set of seven evolutiona…
Oxygen and nitrogen abundances of HII regions in six spiral galaxies
Alexander S. Gusev, Leonid S. Pilyugin, Firouz Sakhibov +3
Spectroscopic observations of 63 HII regions in six spiral galaxies (NGC 628, NGC 783, NGC 2336, NGC 6217, NGC 7331, and NGC 7678) were carried out with the 6-meter telescope (BTA)…
Time delay between images of the lensed quasar UM673
E. Koptelova, W. P. Chen, T. Chiueh +11
We study brightness variations in the double lensed quasar UM673 (Q0142-100) with the aim of measuring the time delay between its two images. In the paper we combine our previously…
The Stellar Composition of the Star Formation Region CMa R1 -- III. A new outburst of the Be star component in Z CMa
M. E. van den Ancker, P. F. C. Blondel, H. R. E. Tjin A Djie +5
We report on a recent event in which, after more than a decade of slowly fading, the visual brightness of the massive young binary Z CMa suddenly started to rise by about 1 magnitu…
Steps Toward Determination of the Size and Structure of the Broad-Line Region in Active Galactic Nuclei. XVI. A Thirteen-Year Study of Spectral Variability in NGC 5548
B. M. Peterson, the International AGN Watch
We present the final installment of an intensive 13-year study of variations of the optical continuum and broad H-beta emission line in the Seyfert 1 galaxy NGC 5548. The data base…
The Stellar Composition of the Star Formation Region CMa R1. II. Spectroscopic and Photometric Observations of 9 Young Stars
H. R. E. Tjin A Djie, M. E. van den Ancker, P. F. C. Blondel +4
We present new high and low resolution spectroscopic and photometric data of nine members of the young association CMa R1. All the stars have circumstellar dust at some distance as…