scholarly journals Spectral types of companions to variable visual double stars

1985 ◽  
Vol 97 ◽  
pp. 434 ◽  
Author(s):  
E. M. Halbedel
Keyword(s):  
Double Stars ◽  
Visual Double Stars

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.

scholarly journals Astrometric Standard Fields for CCD Observations of Double Stars

1994 ◽  
Vol 161 ◽  
pp. 291-293
Author(s):  
D. Sinachopoulos ◽  
E. Oblak ◽  
M. Geffert ◽  
J. Colin ◽  
J.-F. LeCampion ◽  
...  
Keyword(s):  
Scientific Community ◽  
Photometric Data ◽  
Stellar Systems ◽  
European Network ◽  
Multiple Star ◽  
Double Stars ◽  
Visual Double Stars ◽  
Ccd Observations ◽  
Formation And Evolution ◽  
Selection Of

The number of known double stars is steadily increasing, thanks to ground-based and space observations. Therefore the ratio of known double to single stars has to be revised upwards continuously. With the Hipparcos parallaxes it will be possible to get stellar statistics for precisely defined volumes of space. This will lead to strong constraints on all astrophysical calibrations of masses, spectral types and luminosities in the solar neighbourhood. A European network of laboratories was created in August 1990 in order to remedy the lack of photometric data for close visual double stars. This network intends to study all aspects of formation and evolution of double and multiple star systems. The immediate goal of the group is to provide the scientific community with a compilation of known photometric data on a large selection of close visual double stars and to significantly enlarge this information by new observations with modern devices. A photometric database of stellar systems is being compiled from most widely used photometric systems in collaboration with the ‘Centre de Données Stellaires’ of Strasbourg.

scholarly journals The Pulkovo Programme for the Study of Visual Double Stars

1990 ◽  
Vol 141 ◽  
pp. 63-64
Author(s):  
A. A. Kisselev ◽  
O. P. Bykov ◽  
O. A. Kalinichenko ◽  
O. V. Kiyaeva ◽  
L. G. Romanenko ◽  
...  
Keyword(s):  
Second World War ◽  
World War ◽  
Photographic Technique ◽  
Double Stars ◽  
Visual Double Stars ◽  
Traditional Work ◽  
Second World ◽  
Visual Binaries

The observation of visual double stars at Pulkovo is a traditional work of Pulkovo astronomers started by W. Struve in 1830 at Dorpat (now Tartu). After the Second World War and restoration of the observatory in 1960, the observations of double stars have been carried out with help of 26-inch Zeiss refractor using the photographic technique. We observe the visual binaries which satisfy the conditions of highest accuracy of astrometric reduction: d > 3′, m < 12.0, dm < 1.0, δ>20°.

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