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The List of Possible Double and Multiple Open Clusters between Galactic Longitudes 240° and 270°
Casado, J.
Abstract—This work studies the candidate double and multiple open clusters (OCs) in the galactic sector from l = 240° to l = 270°, which contains the Vela-Puppis star formation region. To do that, we have searched the most recent and complete catalogues of OCs by hand to get an extensive list of 22 groups of OCs involving 80 candidate members. Gai…
Comparison of the Orbital Properties of the Milky Way Globular Clusters from the Data of the Gaia DR2 and EDR3 Catalogs
Bobylev, V. V.; Bajkova, A. T.
We provide new values of the orbital parameters of 152 globular clusters, which are calculated using the new mean proper motions obtained from the Gaia EDR3 catalog data. The orbits were integrated 5 Gyr back in an axisymmetric three-component potential with a spherical bulge, disk component, and spherical dark halo in the Navarro-Frenk-White form…
Destruction of Galaxies as a Cause of the Appearance of Stellar Streams
Vereshchagin, S. V.; Tutukov, A. V.; Sizova, M. D.
The interaction of galaxies in clusters with the intergalactic gaseous medium and other galaxies is considered. The causes for the appearance of gaseous and stellar "tails" and stellar "copies" of galaxies during their movement in a dense gaseous medium in the cores of clusters and during the tidal destruction of colliding galaxies are studied. Th…
The First Light Curve Solution of GW Leo and Refined Ephemeris of Two Contact Binary Systems
Poro, A.; Davoudi, F.; Lashgari, E. +6 more
We performed the first light curve analysis of GW Leo and a new ephemeris is obtained for QT Boo. The light curve investigation also yields that the system GW Leo is a contact W UMa eclipsing binary with a photometric mass ratio of q = 0.44 ± 0.03, a fillout factor of f = 59.6%, and an inclination of 50.77° ± 0.09°. Due to the O'Connell effect whi…
Improving the Orbits of Four Visual Binaries Using Gaia DR2 Data and Observations with the 26-inch Refractor of Pulkovo Observatory
Romanenko, L. G.; Izmailov, I. S.
We use a modified method of the apparent motion parameters (AMP), in which the initial data from the Gaia DR2 catalog are not only high-precision coordinates, parallaxes, and radial velocities of the components of the studied wide binary stars, but are also their proper motions. The coincidence of the AMP orbits obtained both from the Gaia DR2 dat…
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…