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Chemical Composition of Globular Clusters of Milky Way Subsystems from Gaia DR2 Data
Bobylev, V. V.; Bajkova, A. T.; Korchagin, V. I. +1 more
Results of a study of the kinematic and chemical properties of globular clusters of the Milky Way based on data from the Gaia DR2 catalog and meaurements with the Hubble Space Telescope are presented. A new method for dividing globular clusters into Galatic subsystems based on the elements of their Galactic orbits is proposed. Samples of globular …
Influence of Digital Noise on Interpretation of a Transit Light Curve
Abubekerov, M. K.; Gostev, N. Yu.
The algorithms often used for the interpretation of light curves, such as the frequently applied JKTEBOP algorithm, have limited accuracy, which causes rounding errors, and hence a non-physical contribution to the residuals (digital noise). The transit light curve of the binary HD 209458 is used as an example to demonstrate the need to take into a…
Spectroscopy of Globular Clusters in the Spheroidal Dwarf Galaxy IKN
Sharina, M. E.; Shimansky, V. V.
Moderate resolution spectra of four globular clusters in the dwarf spheroidal galaxy IKN obtained with the 6-m telescope of the Special Astrophysical Observatory have been used to determine the radial velocities, ages, and metallicities of the clusters, and also to derive the first approximate estimates of the abundances of Mg, Ca, and C. Cross-co…
Surface Photometry of Proplyds in the Vicinity of θ 1 Ori C
Ismailov, N. Z.; Mamedkhanova, G. B.
Results of studies of the surface-brightness distributions of a group of young stellar objects located within 16″ of the star θ 1 Ori C are presented. Isophotes around each proplyd are constructed using violet, red, and near-infrared images. No regularity in the sizes of the diametral cross sections of the proplyds in the various photom…