Orbits of the visual binaries ADS 8814 and ADS 8065 from observations along a short arc     

A. A. Kiselev  O. V. Kiyaeva  L. G. Romanenko  N. A. Gorynya 《Astronomy Reports》2012,56(7):524-535

The orbits of the visual binaries ADS 8814 and ADS 8065 are determined for the first time. The orbits were calculated using the parameters of the apparent motion, based on position observations along short arcs obtained on the 26-inch refrector of the Pulkovo Observatory, supplemented with radial-velocity observations for the stellar components in both pairs obtained on the 1-m telescope of the Simeiz Section of the Crimean Astrophysical Observatory. All previous visual and photographic observations of these stars after 1832 were also taken into account. The orbit of ADS 8814 was refined using the differential-correction method. The orbital periods of these two stars are about 800 and 6000 years, respectively. The mass estimates derived for the known parallaxes from the Hipparcos catalog correspond to the spectral types of these stars. The polar vectors of the obtained orbits in Galactic coordinates are also given.  相似文献   

Accurate relative positions and motions of poorly studied binary stars     

O. V. Kiyaeva  A. A. Kiselev  L. G. Romanenko  O. A. Kalinichenko  T. A. Vasil’eva 《Astronomy Reports》2012,56(12):952-965

We have studied the relative motions of the components of 25 visual binary and multiple stars for which only a modest number of observations of various types had accumulated due to their small relative component motions. A uniform series of photographic observations obtained over many years on the 26-inch refractor of the Pulkovo Observatory are used to calculate the parameters of the apparent relative positions and motions, which can be used for further kinematic and dynamical studies of these stars. A comparison of the relative and proper motions of the components indicates that they are physically bound. Optical components are identified in six systems??for the first time in the three systemsWDS00082+6217, ADS 830, and ADS 7361. The relative motions in ADS 861 and ADS 12925 suggest the presence of perturbing invisible companions, but this requires confirmation based on more accurate observations. The apparent motion parameters method yields a family of orbits with a minimum period of 26 000 yrs for the nearby wide visual binary Gliese 745, for which the parallax and relative radial velocity of the components are known.  相似文献   

Orbits of four visual binaries determined from observations along short arcs     

L. G. Romanenko  A. A. Kiselev 《Astronomy Reports》2014,58(1):30-38

The orbits of the four visual binaries ADS 246 (GL 15), ADS 7724 (γ Leo), ADS 10386 (GJ 659), and ADS 14909 (1 Peg) have been determined using the apparent motion parameters (AMP) method. The orbital periods of these stars are 1200, 550, 7500, and 18 000 yr, respectively. The orbits were calculated based on observations along short arcs obtained with the 26-inch refractor of the Pulkovo Observatory and Hipparcos parallaxes, supplemented with radial-velocity measurements for the components of these pairs taken from the literature. All visual and photographic observations of these stars after 1830 from the WDS catalog have been taken into consideration. The new orbits of ADS 246 and ADS 7724 are compared with the orbits computed in other studies. The orbits of ADS 10386 and ADS 14909 have been determined for the first time. The orientation of the planes of the computed orbits in Galactic coordinates have also been calculated.  相似文献   

Intermediate-mass black holes in globular clusters     

A. A. Kiselev  Yu. N. Gnedin  N. A. Shakht  E. A. Grosheva 《Astrophysical Bulletin》2011,66(4):436-441

The mass of central bodies in a number of Milky-Way globular clusters is estimated based on the stellar radial-velocity dispersion data. It is assumed that stars located close to the center of the cluster (i.e., to the black hole) rotate about it, have masses on the order of the solar mass, and that the mass of the gravitating center is greater by a factor of 1000. The radial velocities of stars in the vicinity of cluster centers are analyzed for two hypothetical extreme cases: (1) ordered orbital motion of stars about the gravitating center and (2) chaotic orbital motions. The masses inferred for most of the clusters (10²–10⁴ M _⊙) correspond to intermediate-mass black holes. Another important result of this study consists in the determination of the quantity l, the characteristic scale length of the additional spatial dimension. Given the age and mass of the globular cluster NGC 6397 we estimate l to be between 0.02 and 0.14 mm.  相似文献   

First results of zircon LA-ICP-MS U-Pb dating of the rocks from the Granulite complex of Khanka massif in the Primorye region   总被引：2，自引：0，他引：2  

A. I. Khanchuk  G. M. Vovna  V. I. Kiselev  M. A. Mishkin  S. N. Lavrik 《Doklady Earth Sciences》2010,434(1):1164-1167

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Lamproite and kimberlite of the Sayany area: Composition,sources, and diamond potential     

Egorov  K. N.  Kiselev  A. I.  Men’shagin  Yu. V.  Minaeva  Yu. A. 《Doklady Earth Sciences》2010,435(2):1670-1675

Doklady Earth Sciences -  相似文献