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Published February 2001 | Published
Journal Article Open

Dark-speckle coronagraphic detection of binary stars in the near-IR

Abstract

In this paper, we present the first attempt to obtain images of binary stars in the near IR using the dark-speckle method on the 3.6 m telescope at La Silla. Promising results are presented, despite the effect of the detector high read-out noise affecting the efficiency of speckle observations. We give some comparisons with the long exposure method. We derive in these data a reliable limit of detection for binary star companions, around m_K < 4 stars, which is about Δm_K ≈ 6-7 for angular separations ranging from 0.5" to 0.9".

Additional Information

© ESO 2001. (Received 13 June 2000 / Accepted 28 November 2000) We wish to thank the ESO-3.6 m team and especially F. Marchis for his efficient support during the allocated nights. We are also grateful to Antoine Labeyrie for helpful discussions and careful reading of the manuscript and to the referee for its constructive comments.

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August 19, 2023
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