Dark-speckle coronagraphic detection of binary stars in the near-IR*
GPS - CalTech Pasadena, CA, USA e-mail: firstname.lastname@example.org
2 ESO Santiago, Chile e-mail: email@example.com
3 LAOG, Laboratoire d'Astrophysique de Grenoble, France e-mail: firstname.lastname@example.org; email@example.com; firstname.lastname@example.org
Accepted: 28 November 2000
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 stars, which is about for angular separations ranging from to .
Key words: methods: data analysis / techniques: interferometric / instrumentation: adaptives optics / binaries: close / planetary systems
© ESO, 2001