scholarly journals Photometric Observations of Three Double Stars by the Occultation Method — Comparison with Interferometric Results and with Preliminary Results of HIPPARCOS

1992 ◽  
Vol 135 ◽  
pp. 546-548
Author(s):  
M. Froeschlé ◽  
C. Meyer
Keyword(s):  
Diffraction Pattern ◽  
Method Comparison ◽  
Short Description ◽  
Double Star ◽  
Preliminary Results ◽  
Double Stars ◽  
Photometric Observations

AbstractWe first briefly recall the geometry of the occultation of a double star by the Moon’s edge. Then we give a short description of the principle of the formation of the diffraction pattern. We present the results for three double stars and compare them with those obtained by other methods.

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.

scholarly journals Astrometric Application of the Photoelectric Scanning Technique

1971 ◽  
Vol 5 ◽  
pp. 20-21
Author(s):  
Otto G. Franz
Keyword(s):  
Data Acquisition ◽  
National Science Foundation ◽  
Data Acquisition System ◽  
Double Star ◽  
Acquisition System ◽  
National Science Foundation Grant ◽  
Double Stars ◽  
Scanning Technique ◽  
National Science ◽  
Associated Data

AbstractA new photoelectric area scanner, designed primarily for observations of double stars, has been put into routine use at the Lowell Observatory. A description of the scanner and of the associated data acquisition system is given. The procedure of measuring the relative positions of double star components is described and the accuracy obtainable by this method is discussed. This contribution and a subsequent one (p. 170) will appear jointly under the title 'A Photoelectric Area Scanner for Astrometry and Photometry of Double Stars' in Lowell Observatory Bulletin No. 154. This work has been supported by National Science Foundation Grant GP-6983.

scholarly journals Speckle Interferometry of Double Stars from the Southern Hemisphere

1995 ◽  
Vol 166 ◽  
pp. 392-392
Author(s):  
E. Horch ◽  
W. F. Van Altena ◽  
T. M. Girard ◽  
C. E. López ◽  
O. Franz
Keyword(s):  
Southern Hemisphere ◽  
Main Sequence ◽  
Speckle Interferometry ◽  
Double Star ◽  
Lower Portion ◽  
Stanford University ◽  
Imaging Device ◽  
Double Stars ◽  
Microchannel Array

We have started a new program of double star observations in the southern hemisphere which utilizes the technique of speckle interferometry. Observations are made using the Stanford University speckle interferometer on the 76-cm reflector at the Cesco Observatory at El Leoncito, Argentina (jointly run by Universidad Nacional de San Juan and Yale Southern Observatory), although we will also have access to larger aperture telescopes. The Stanford system, formerly used at Lick Observatory, is on long term loan to us from Dr. Gethyn Timothy and features a multi-anode microchannel array (MAMA) detector as the imaging device. This new program of double star research will help alleviate the continuing problem of fewer speckle observations in the southern hemisphere. In combination with other data such as the eyepiece interferometer measures of Finsen and Hipparcos parallaxes, it should also eventually contribute to a better understanding of the lower portion of the main sequence mass-luminosity relation.

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.

Continuation of an account of the changes that have happened in the relative situation of double stars

1832 ◽  
Vol 1 ◽  
pp. 158-158
Keyword(s):  
Double Star ◽  
Proper Motions ◽  
Double Stars

In the former part of this paper, Dr. Herschel mentioned the changes he had noticed in the situation of six double stars; and in investigating the causes of those changes, he declared that he had recourse to the most authentic observations he could find of their motions in right ascensions and polar distance, especially in the instance of the double star Castor: but finding in the tables which have been lately published in the last volume of the Greenwich Observations, which give the proper motions of thirty-six stars, that (especially in the instance of the above-named star,) the motions are somewhat different from those he assigned to them in his former communication, he now undertakes to review the arguments he there used, in order to ascertain what will be the result of these new motions. As this investigation, which forms the first part of the present paper, has a continual reference to the contents of the preceding one, it will be in vain to attempt an abridgement, which could not be rendered intelligible within our usual limits. Nor can we enter here into a detail of the sequel of Dr. Herschel’s observations on the changes in the situation of a great number of additional double stars; this second part of the paper, in which they are fully detailed, being itself a minute of his proceedings, in which he is at particular pains to point out that these changes of situation are not the effect of parallax.

scholarly journals Activities and Achievements of the Double Star Committee of the Société Astronomique de France

2006 ◽  
Vol 2 (S240) ◽  
pp. 509-526
Author(s):  
Jean-Louis Agati ◽  
Sébastien Caille ◽  
André Debackère ◽  
Pierre Durand ◽  
Florent Losse ◽  
...  
Keyword(s):  
Great Britain ◽  
Double Star ◽  
Comparison Star ◽  
Double Stars ◽  
The World ◽  
The Creation ◽  
The 1960S

In a synthesis article (see ref. below), the double star expert Paul COUTEAU put the work of French pioneers of double stars observation in the perspective of the double star work carried in the world. After Antoine Yvon VILLARCEAU and Camille FLAMMARION, one prominent pioneer of double stars was Robert JONCKHEERE (1888–1974), an amateur before circumstances prompted him to become a professional astronomer, who devoted his life to double stars. Kenneth Glyn Jones wrote a biography and Charles Fehrenbach his obituary. Jean-Claude Thorel studied his life and career in double star observations (see Section 10 below). In the 1930s, another precursor of the Commission des Étoiles Doubles, Maurice DURUY (1894–1984) invented the micrometer with a comparison star, and applied the diffraction micrometer invented by Ejnar Hertzsprung to the measure of double stars, which he regularly observed at Nancy with a 275-mm telescope, at Lyon with a 162-mm telescope and in his observatory of Beaume-Mêle with a 40-cm and later a 60-cm telescope at Le Rouret (Alpes–Maritimes). He measured standard pairs of the list of Paul Muller and published his measures in the Journal des Observateurs; these measures requested by Paul Muller aimed at comparisons of between observers. He also collaborated with the Webb Society of Great Britain; Glyn Jones published his astronomical biography. Already in 1924, the pediatrician Paul BAIZE (1901–1995) had started the measurement of double stars as an amateur. He was granted permission to measure them with the 38-cm of the Paris Observatory and made an impressive number of measures during his long “career" (24044). He also made orbit calculations and established a formula for the calculation of dynamic parallaxes in 1946. He wrote articles explaining new observation techniques devoted to double stars in the magazine L'Astronomie and continued his astronomical activity until the beginning of the 1990s. Glyn Jones published an astronomical biography of Paul Baize. In the 1960s, Bernard CLOUET and the late Robert SAGOT (1910–2006) made double star observations for the book which was then in preparation under the title La revue des constellations. Their measures remained unpublished; but publication of the measures made by Robert SAGOT is in preparation. At about the same time, the neurology professor Jacques LE BEAU (1908–1998) made the acquaintance of renowned professional astronomer Paul COUTEAU and learned from him how to measure double stars. Each year, he stayed for two weeks at Nice and conducted his observations with the 50-cm refractor of the Nice Observatory. In 1978, Paul COUTEAU published the first book in French devoted to double stars: L'observation des étoiles doubles visuelles. That book triggered the interest of more amateur astronomers for double stars and indirectly influenced the creation of a group of double star observers which was transformed into the Commission des Étoiles Doubles

scholarly journals XIV. Continuation of an account of the changes that have happened in the relative situation of double stars

1804 ◽  
Vol 94 ◽  
pp. 353-384 ◽  
Keyword(s):  
Double Star ◽  
Proper Motions ◽  
Double Stars ◽  
North Polar ◽  
Right Ascension

In my former Paper, I have given the changes which have happened in the situation of six double stars. When the causes of these observed changes in the double star Castor were investigated, I had recourse to the most authentic observations I could find, of the motions in right-ascension and polar distance of this star. But the Tables which have been lately published, in the last volume of the observations made by the Astronomer Royal at Greenwich, give us now the proper motions of 36 principal stars, of which α Geminorum is one; and, as the motion of this star, especially in north polar distance, is very different from what it has been supposed in my former examination, it will be necessary to review the arguments which have been used, in order to ascertain what will be the result of this new motion. We shall here again follow the order of the paragraphs of the former Paper, and denote those which treat of the same motions, with the same letters, that they may be readily compared.

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 Photometric Observations of Visual Double Stars by the Area Scanning Technique

1971 ◽  
Vol 5 ◽  
pp. 170-170
Author(s):  
Otto G. Franz
Keyword(s):  
Double Stars ◽  
Scanning Technique ◽  
Visual Double Stars ◽  
Photometric Observations ◽  
Visual Binaries

AbstractUBV magnitude differences in visual binaries are presented and their accuracy is discussed. Typical observed image profiles of double stars, including sample profiles of Antares, are shown. This contribution will appear jointly with the earlier one (p. 20) in Lowell Obs. Bull., No. 154. The work has been supported by NSF Grant GP-6983.

Crowded Field Photometry using Post-Exposure Image Sharpening Techniques

1993 ◽  
Vol 136 ◽  
pp. 147-153 ◽  
Author(s):  
R.M Redfern ◽  
A. Shearer ◽  
R. Wouts ◽  
P. O’Kane ◽  
C. O’Byrne ◽  
...  
Keyword(s):  
High Resolution ◽  
Globular Clusters ◽  
Image Sharpening ◽  
Preliminary Results ◽  
Post Exposure ◽  
Double Stars ◽  
High Resolution Images

AbstractThe technique of image sharpening which allows high resolution images to be produced from ground-based telescopes is applied to the problem of photometry in crowded field regions - such as close to the cores of globular clusters. The conditions for image sharpening are discussed and the technique is demonstrated using simple objects (close double stars). Preliminary results from image sharpening of M15 are presented.

Sign in / Sign up

Export Citation Format

Share Document