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 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 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 Remark in Regard to Bidelman's Data-Bank Project

1973 ◽  
Vol 50 ◽  
pp. 288-288
Author(s):  
W. P. Bidelman
Keyword(s):  
United States ◽  
Large Data ◽  
Data Bank ◽  
Data File ◽  
The United States ◽  
Readable Form ◽  
The Status ◽  
Machine Readable ◽  
Machine Readable Form

The concept of a general stellar data bank is not a new idea, but the desirability of this project at the present time has been emphasized by a number of astronomers (Bidelman, Jaschek, Cayrel, Hauck and others) and work is proceeding both in the United States and elsewhere. The status of my own activities in this direction is as follows:The general stellar data file now at the Warner and Swasey Observatory is continually being updated and much more of the astronomical literature is being systematically searched and the resulting data and references entered into the file. However this project is still largely unfunded and progress is far slower than desirable. In particular the file is still not available in machine-readable form, though several of the newer large data catalogues, such as the Warner and Swasey southern OB-star survey of Stephenson and Sanduleak, will be entered into the file in IBM card-form rather the entire file will be converted to punched cards.

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 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.

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.

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 Subject Access to a Data Base of Library Holdings

1974 ◽  
Vol 7 (4) ◽  
pp. 267
Author(s):  
Alice S. Clark
Keyword(s):  
Public Service ◽  
Public Libraries ◽  
Ohio State University ◽  
State University ◽  
Complete Collection ◽  
Remote Locations ◽  
Readable Form ◽  
The Ohio State University ◽  
Machine Readable ◽  
Machine Readable Form

As more academic and public libraries have some form of bibliographic description of their complete collection available in machine-readable form, public service librarians are devising ways to use the information for better retrieval. Research at the Ohio State University tested user response to paper and COM output from selected areas of the shelflist. Results indicated users at remote locations found such lists helpful, with some indication that paper printout was more popular than microfiche.

scholarly journals SUSI’s Potential for Double Star Research

1992 ◽  
Vol 135 ◽  
pp. 521-526
Author(s):  
John Davis
Keyword(s):  
Angular Resolution ◽  
Double Star ◽  
Double Stars ◽  
Stellar Interferometer ◽  
New Instrument

AbstractThe Sydney University Stellar Interferometer (SUSI) is currently undergoing commissioning and will soon commence its astronomical program in which observations of double stars will form a major component. With its 640-m long North–South array of input siderostats, the new instrument will have unprecedented angular resolution.

Sign in / Sign up

Export Citation Format

Share Document