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An Improved Method of Photographic Measures of Double Stars

Published online by Cambridge University Press:  12 April 2016

D. Rodriguez ,
J.A. Bernedo  and
D. Valls-Gabaud
D. Rodriguez
Affiliation:
Agrupación Astronómica de Madrid, Apartado 1039, E-28080 Madrid, Spain
J.A. Bernedo
Affiliation:
Agrupación Astronómica de Madrid, Apartado 1039, E-28080 Madrid, Spain Planetario de Madrid, Parque Tierno Galván, E-28045 Madrid, Spain
D. Valls-Gabaud
Affiliation:
Agrupación Astronómica de Madrid, Apartado 1039, E-28080 Madrid, Spain Institut d’Astrophysique de Paris, 98 bis, Bid. Arago, F-75014 Paris, France

Extract

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We present a new technique in double star photography leading to high accuracy measurements in amateur-size instruments. The trailing method has been improved by the use of a chopper that cuts the trail into a number of segments. The chopper period is accurately known, so it is the length of each segment on the plate. In this way the scale factor is measured in each exposure. Fine-grain films, such as hyper-sensitized Kodak 2415, are used and all measurements are performed at the microscope. The same technique may also be applied to CCD cameras. A statistical analysis of errors shows that Δθ ≤ 30′ and Δρ/ρ ≈ 0.01 for most binaries with ρ ≥ 3″. This method has been applied to professional-amateur joint programs dealing with multiple systems with variable components and a survey of poorly-observed wide binaries.

Type
Part II Observational Methods
Information
International Astronomical Union Colloquium , Volume 98: Stargazers: The Contribution of Amateurs to Astronomy , 1988 , pp. 122 - 127
Copyright
Copyright © Springer-Verlag 1988

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