Physical and Optical Visual Double Stars of the North-Polar Area as Obtained by Photographic Observations at Pulkovo

1997 ◽  
pp. 85-88 ◽  
Author(s):  
E. A. Grosheva
Keyword(s):  
Double Stars ◽  
The North ◽  
Visual Double Stars ◽  
Polar Area ◽  
North Polar

Double Stars with Common Proper Motion

1965 ◽  
Vol 5 ◽  
pp. 49-51
Author(s):  
Willem J. Luyten
Keyword(s):  
Proper Motion ◽  
Galactic Latitude ◽  
Schmidt Telescope ◽  
Polar Cap ◽  
Double Stars ◽  
The North ◽  
North Polar

The proper Motion Survey with the 48-in Schmidt telescope has now progressed far enough such that we may begin to make some meaningful statistical discussions of the results obtained. Altogether 135 regions have been blinked – one seventh of the total -and in particular all fifty plates covering the area of the North Polar Cap, north of declination +69 (1855) have been blinked and completely measured. This area covers 1360 square degrees, almost exactly one thirtieth of the entire sphere, and, since the galactic latitude of the Pole is 27°, and its distance from the ‘average’ solar apex is about 55° this region may be considered as not too unrepresentative for the whole sky.

scholarly journals CCD Astrometry and Photometry of Visual Double Stars: Northern Hipparcos Wide Pairs Measured in the Years 2003-2005

2006 ◽  
Vol 2 (S240) ◽  
pp. 613-618
Author(s):  
D. Sinachopoulos ◽  
P. Gavras ◽  
Th. Medupe ◽  
Ch. Ducourant ◽  
O. Dionatos
Keyword(s):  
Angular Separation ◽  
Double Star ◽  
Solar Neighborhood ◽  
Common Origin ◽  
Double Stars ◽  
The North ◽  
Visual Double Stars ◽  
Wide Pairs ◽  
Stellar Formation ◽  
Formation And Evolution

AbstractThe relative positions of Hipparcos visual double star components are currently known with a precision around fifty mas. Modern CCD astrometric observations of these objects achieve an accuracy of their angular separation between ten and twenty mas per observation. New CCD measurements have been obtained at Kryonerion Observatory in the north hemisphere. They provide current relative positions of visual double stars which are at least twice as accurate as the ones provided by Hipparcos. The new measurements will permit us to extract the physical pairs from the sample, and the double stars, which have components of common origin. Final statistics of these systems will improve our understanding of stellar formation and evolution rates of wide binaries in the solar neighborhood.

scholarly journals Double Stars with Common Proper Motion

1971 ◽  
Vol 5 ◽  
pp. 49-51
Author(s):  
Willem J. Luyten
Keyword(s):  
Proper Motion ◽  
Schmidt Telescope ◽  
Polar Cap ◽  
Double Stars ◽  
The North ◽  
North Polar

The proper Motion Survey with the 48-in Schmidt telescope has now progressed far enough such that we may begin to make some meaningful statistical discussions of the results obtained. Altogether 135 regions have been blinked - one seventh of the total - and in particular all fifty plates covering the area of the North Polar Cap, north of declination +69 (1855) have been blinked and completely measured.

Spectroscopic Observations of Visual Double Stars

1965 ◽  
Vol 5 ◽  
pp. 109-111
Author(s):  
Frederick R. West
Keyword(s):  
Radial Velocity ◽  
High Dispersion ◽  
Velocity Difference ◽  
Spectrograph Slit ◽  
Spectroscopic Observations ◽  
Double Stars ◽  
Visual Double Stars ◽  
Relative Orbit ◽  
Two Component ◽  
Star Images

There are certain visual double stars which, when close to a node of their relative orbit, should have enough radial velocity difference (10-20 km/s) that the spectra of the two component stars will appear resolved on high-dispersion spectrograms (5 Å/mm or less) obtainable by use of modern coudé and solar spectrographs on bright stars. Both star images are then recorded simultaneously on the spectrograph slit, so that two stellar components will appear on each spectrogram.

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