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Contribution of Binary Stars to the Velocity Dispersion inside OB Associations with Gaia DR2 Data
Melnik, A. M.; Dambis, A. K.
We estimated the contribution of binary systems to the velocity dispersion inside OB-associations derived from Gaia DR2 proper motions. The maximum contribution to the velocity dispersion is given by the systems with the period of revolution of $P = 5.9$ yr whose components shift by a distance of about the diameter of the system during the base-li…
Properties of Stellar Populations of Eight Galactic Global Clusters with Low Central Surface Brightness
Sharina, M. E.; Maricheva, M. I.
This paper presents the results of the analysis of the integrated-light spectra of eight Galactic globular clusters with a relatively low luminosity and stellar density: Palomar 1, Palomar 2, Palomar 10, Palomar 13, Palomar 14, NGC 6426, NGC 6535, and NGC 6749. The absorption spectral indices in the Lick system were measured in their spectra, as w…