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Observation of Multiple Stars with the Digital Speckle Interferometer

Published online by Cambridge University Press:  12 April 2016

D. Bonneau  and
L. Koechlin
D. Bonneau
Affiliation:
Centre d’Etudes et de Recherches Géodynamiques et Astronomiques, Observatoire de Calern Caussols, F-06460 St Vallier de Thiey, France
L. Koechlin
Affiliation:
Centre d’Etudes et de Recherches Géodynamiques et Astronomiques, Observatoire de Calern Caussols, F-06460 St Vallier de Thiey, France

Abstract

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Since 1977, the Digital Speckle Interferometer chiefly developed for the study of atmospheric structure in cool supergiant stars, has been used for observing multiple stars. It has provided binary star resolution down to 30 milliarcsec. separation with a precision from 3% to 10%.

The incertitude on position angle determination ranges from ± 1° to ± 5°.

Working in photon counting mode, we are able to estimate magnitude difference reaching Δ m ~ 3.0 with an uncertainty of about 0.2−0.3 magnitude.

On the basis of present experimentation, we think that 17th mag binaries can be resolved with a 3.6 meter telescope.

Type
Research Article
Information
International Astronomical Union Colloquium , Volume 62: Current Techniques in Double and Multiple Star Research , May 1983 , pp. 154 - 155
Copyright
Copyright © Lowell Observatory 1983

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