scholarly journals Visual Double Star Catalogs — Past, Present, and Future

1992 ◽  
Vol 135 ◽  
pp. 284-290
Author(s):  
Charles E. Worley
Keyword(s):  
Data Base ◽  
18Th Century ◽  
Double Star ◽  
Star Data ◽  
Double Stars ◽  
Future Needs ◽  
Visual Double Stars ◽  
Late 18Th Century ◽  
Star Catalogs ◽  
Systematic Collection

AbstractThe first lists of visual double stars were published by Mayer and Herschel in the late 18th century, but only sporadic lists and catalogs appeared during most of the following century, until Burnham began the systematic collection of such data, which has continued to this day. This contribution discusses the evolution of the visual double star data base over the last centuries and suggests how the data might be ordered to serve future needs.

scholarly journals The New Index Catalog of Visual Double Stars-WDS

1986 ◽  
Vol 109 ◽  
pp. 649-651
Author(s):  
Charles E. Worley ◽  
Geoffrey G. Douglass
Keyword(s):  
Double Star ◽  
Star Catalog ◽  
Star Data ◽  
Double Stars ◽  
Visual Double Stars

A new index catalog of visual double stars, the Washington Double Star Catalog (WDS), 1984.0, is now available in tape form. All of the double star data has been updated, as well as the notes to the catalog. This report summarizes the contents of the WDS and describes its compilation.

scholarly journals Observational Procedures for Visual Double-Star Work

1973 ◽  
Vol 18 ◽  
pp. 81-87
Author(s):  
Otto G. Franz
Keyword(s):  
United States ◽  
The United States ◽  
Double Star ◽  
Image Tube ◽  
International Conference ◽  
Double Stars ◽  
Visual Double Stars ◽  
Early Image ◽  
The Subject ◽  
Observational Techniques

When IAU Symposium No. 17, the most recent international conference on visual double stars to take place in the United States, was held in Berkeley in 1961, there was little discussion on observational techniques and no introductory remarks were presented on the subject. The reasons for this are obvious. The classical techniques of double-star observation, those that provided virtually all the data available on visual double stars, were too well known to require introduction or discussions; other methods, with the possible exception of early image tube and electronic camera experiments, did not exist.Today, more than ten years later, most double-star work continues to be carried out by the same classical techniques. However, several methods have come into use or have recently been developed that are capable of contributing importantly to visual double-star research.

scholarly journals Systematic Errors in Double Star Observations

1992 ◽  
Vol 135 ◽  
pp. 311-313 ◽  
Author(s):  
Geoffrey G. Douglass ◽  
Charles E. Worley
Keyword(s):  
Root Mean Square ◽  
Proximity Effect ◽  
Position Angle ◽  
Systematic Errors ◽  
Double Star ◽  
Mean Square ◽  
Double Stars ◽  
Visual Double Stars ◽  
Systematic Effects

AbstractWe have examined the visual and speckle observations of visual double stars made by 31 experienced observers in order to evaluate possible systematic errors in these series. Using 57 “definitive” orbits, we find no appreciable errors in position angle. We do find systematic effects in separation for some observers, and, in particular, a “proximity” effect for measurements of pairs closer than 0″.5.Root-mean-square residuals are:

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 Observational Techniques and Results for Visual Double Stars

1983 ◽  
Vol 62 ◽  
pp. 1-9 ◽  
Author(s):  
Charles E. Worley
Keyword(s):  
Data File ◽  
Double Star ◽  
Punch Card ◽  
Double Stars ◽  
Visual Double Stars ◽  
Complete Set ◽  
Machine Readable ◽  
The 19Th Century ◽  
Observational Techniques ◽  
Machine Readable Form

A little more than a century and a half has passed since F.G.W. Struve began to provide the astronomical world with visual double star measures of both quantity and quality. Since that time, nearly a million individual measures have been made by all techniques, and most of these are now available in machine-readable form in the punch-card Observation Catalog maintained at the Naval Observatory. As of 1 March 1981, this Catalog contained 877242 measures grouped into 398818 means. The data file is now virtually complete for all 20th century observations, and perhaps 80% complete for the 19th century material. Additions are being made steadily and we can look forward to having a complete set of observations for every known double star in a few more years.

scholarly journals Kinematics of a sample of visual double stars

2000 ◽  
pp. 101-103
Author(s):  
D. Olevic ◽  
Z. Cvetkovic ◽  
M. Dacic
Keyword(s):  
Double Star ◽  
Statistical Distribution ◽  
Polar Coordinates ◽  
Double Stars ◽  
Visual Double Stars ◽  
Input Catalogue ◽  
Good Agreement

The Hipparcos-Input Catalogue also contains about 8000 already known visual double stars. In the framework of this-project campaign, in addition to other parameters, were also determined the parallaxes ?, as well as the polar coordinates ? and ? for double stars. On the basis of a comparison of these data to those obtained earlier from the ground based measurements (WDS Catalogue) statistical examinations of a double-star sample (1' ? ? ? 14') are performed. It is shown that an exceptionally good agreement exists of the statistical distribution ??/?t of the sample as function of ?(AU) and the curve ? = C(?)/?2 representing the II Kepler law.

The visual double star data base

1991 ◽  
Vol 177 (1-2) ◽  
pp. 371-372
Author(s):  
Charles E. Worley
Keyword(s):  
Data Base ◽  
Double Star ◽  
Star Data

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.

Nature, poetry and medicine in late 18th century England: a unified perspective of Erasmus Darwin

1976 ◽  
Vol 7 (4) ◽  
pp. 537-537
Author(s):  
M. McNEIL
Keyword(s):  
18Th Century ◽  
Human Society ◽  
Nature Poetry ◽  
Medicine And Philosophy ◽  
Late 18Th Century ◽  
Medical Theory ◽  
Lunar Society Of Birmingham ◽  
Organizational Principles ◽  
Century Science ◽  
Erasmus Darwin

Erasmus Darwin was the focus and embodiment of provincial England in his day. Renowned as a physician, he spent much of his life at Lichfield. He instigated the founding of the Lichfield Botanic Society, which provided the first English translation of the works of Linnaeus, and established a botanic garden; the Lunar Society of Birmingham; the Derby Philosophical Society; and two provincial libraries. A list of Darwin's correspondents and associates reads like a "who's who" of eighteenth century science, industry, medicine and philosophy. His poetry was also well received by his contemporaries and he expounded the evolutionary principles of life. Darwin can be seen as an English equivalent of Lamarck, being a philosopher of nature and human society. His ideas have been linked to a multitude of movements, including the nosological movement in Western medicine, nineteenth century utilitarianism, Romanticism in both Britain and Germany, and associationist psychology. The relationships between various aspects of Darwin's interests and the organizational principles of his writings were examined. His poetical form and medical theory were not peripheral to his study of nature but intrinsically linked in providing his contemporaries with a panorama of nature. A richer, more integrated comprehension of Erasmus Darwin as one of the most significant and representative personalities of his era was presented.

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