scholarly journals Astronomy in Uzbekistan

2001 ◽  
Vol 24 (3) ◽  
pp. 231-232
Author(s):  
Sabit P. Ilyasov
Keyword(s):  
Star Formation ◽  
Binary Stars ◽  
Solar Physics ◽  
Open Clusters ◽  
Image Motion ◽  
Close Binary ◽  
Atmospheric Conditions ◽  
Ccd Photometry ◽  
Close Binary Stars ◽  
Star Formation Regions

Ulugh Beg Astronomical Institute (UBAI) of the Uzbek Academy of Sciences is one of the oldest scientific institutions not only in Uzbekistan, but in the whole of Central Asia as well. There are five departments in the institute. The main directions of research are solar physics, young non-stationary and close binary stars in star formation regions, satellite geodynamics, non-linear and non-stationary evolution of galaxies. Helioseismology studies carried out in the frame of the IRIS (International Research on the Interior of the Sun) and TON (Taiwan Oscillation Network) projects. Astrophysical programmes such as a search for periodicity in star-formation regions, study of close binary stars in the same regions, as well as in open clusters, CCD photometry of extra-galactic objects as gravitation lenses have been made at the Maidanak Observatory, which is located in the south-east of Uzbekistan. Monitoring of the seeing at Mt. Maidanak from 1996 to 1999, using ESO Differential Image Motion Monitor, showed that its atmospheric conditions are comparable with the best international observatories. The present status of the main fields of research and prospects are discussed. (Co-author is Shurat A. Ehgamberdiev, Uzbekistan.)

Radial Velocity Studies of Close Binary Stars. II.

1999 ◽  
Vol 118 (5) ◽  
pp. 2451-2459 ◽  
Author(s):  
Slavek M. Rucinski ◽  
Wenxian Lu
Keyword(s):  
Radial Velocity ◽  
Binary Stars ◽  
Close Binary ◽  
Close Binary Stars

scholarly journals Radial Velocity Studies of Close Binary Stars. XII.

2007 ◽  
Vol 133 (5) ◽  
pp. 1977-1987 ◽  
Author(s):  
Theodor Pribulla ◽  
Slavek M. Rucinski ◽  
George Conidis ◽  
Heide DeBond ◽  
J. R. Thomson ◽  
...  
Keyword(s):  
Radial Velocity ◽  
Binary Stars ◽  
Close Binary ◽  
Close Binary Stars

scholarly journals Inclinations of Circumbinary Planets: Assembly of Protoplanetary Discs and Secular Binary-Disc Interaction

2012 ◽  
Vol 8 (S293) ◽  
pp. 146-151
Author(s):  
Dong Lai ◽  
Francois Foucart
Keyword(s):  
Binary Stars ◽  
Outer Region ◽  
Orbital Plane ◽  
Close Binary ◽  
Back Reaction ◽  
Star Forming ◽  
Transiting Planets ◽  
Close Binary Stars ◽  
Mutual Inclination ◽  
Protoplanetary Discs

AbstractThe Kepler satellite has discovered a number of transiting planets around close binary stars. These circumbinary systems have highly aligned planetary and binary orbits. In this paper, we explore how the mutual inclination between the planetary and binary orbits may reflect the physical conditions of the assembly of protoplanetary discs and the interaction between protostellar binaries and circumbinary discs. Given the turbulent nature of star-forming molecular clouds, it is possible that the infalling gas onto the outer region of a circumbinary disc rotates around a different axis compared to the central protostellar binary. Thus, the newly assembled circumbinary disc can be misaligned with respect to the binary. However, the gravitational torque from the binary produces warp and twist in the disc, and the back-reaction torque tends to align the disc and the binary orbital plane. We present a new, analytic calculation of this alignment torque, and show that the binary-disc inclination angle can be reduced appreciably after the binary accretes a few percent of its mass from the disc. Since mass accretion onto the proto-binary is very likely to occur, our calculation suggests that in the absence of other disturbances, circumbinary discs and planets around close (sub-AU) stellar binaries are highly aligned with the binary orbits, while discs and planets around wide binaries can be misaligned.

scholarly journals COMMISSION 42: CLOSE BINARY STARS

2011 ◽  
Vol 7 (T28A) ◽  
pp. 219-226
Author(s):  
Ignasi Ribas ◽  
Mercedes T. Richards ◽  
Slavek Rucinski ◽  
David H. Bradstreet ◽  
Petr Harmanec ◽  
...  
Keyword(s):  
Binary Stars ◽  
Close Binary ◽  
Close Binary Stars

Close Binary Stars (Étoiles Doubles Serrées)

1997 ◽  
pp. 363-394
Author(s):  
M. Rodonò ◽  
E. F. Guinan ◽  
Y. Kondo ◽  
J. V. Clausen ◽  
H. Drechsel ◽  
...  
Keyword(s):  
Binary Stars ◽  
Close Binary ◽  
Close Binary Stars

Close Binary Stars

1985 ◽  
pp. 583-606
Author(s):  
Richard M. West
Keyword(s):  
Binary Stars ◽  
Close Binary ◽  
Close Binary Stars

scholarly journals Mass Loss and Shell Masses of Close Binary Stars

1987 ◽  
Vol 93 ◽  
pp. 675-679
Author(s):  
V.G. Karetnikov
Keyword(s):  
Mass Transfer ◽  
Mass Loss ◽  
Binary Stars ◽  
Transfer Rate ◽  
Mass Transfer Rate ◽  
Close Binary ◽  
Time Interval ◽  
Close Binary Stars

AbstractFrom the values of period changes for 6 close binary stars the mass transfer rate was calculated. Comparing these values Mt with the values of shell masses Msh, the expressionwas derived. The analysis of this expression points out the initial character of the outflow of matter, and one may determine the time interval of the substitution of the shell matter. So one may conclude that for a certain mass transfer rate, a certain amount of matter accumulates in the nearby regions of the system.

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