[ Other preprints | OHP Home Page | Guide Pratique ]
next up previous
Next: Introduction

Present performance of the dark-speckle coronagraph[*]

Boccaletti A.1,3, Moutou C.2,3, Labeyrie A.2,3 Kohler D.2, Vakili F.4

1DESPA, Observatoire de Paris-Meudon, 5 pl J. Janssen
F-92195 Meudon, France

2Observatoire de Haute-Provence
F-04870 St Michel l'Observatoire, France
Moutou@obs-hp.fr, Labeyrie@obs-hp.fr

3Collège de France, 11 Pl. M. Berthelot
F-75321 Paris, France

4Observatoire de la Côte d'Azur, Département Fresnel, GI2T
F-06460 Saint Vallier de Thiey, France

Astronomy & Astrophysics | Received xxx; accepted May 1998


We present the recent developments of the dark speckle coronagraph and results obtained on two close binary stars. The central star is occulted by a Lyot coronagraphic system and the residual speckle pattern is detected on a photon-counting camera. Achromaticity is achieved across a wide spectral band, using a Wynne corrector. We observed the relatively faint companions of $\delta$ Per and $\eta$ Psc and give an independent estimate of their position and magnitude difference.

Keywords : planetary systems - brown dwarfs - techniques: interferometric - binaries: close - stars: $\delta$ Per, $\eta$ Psc, $\eta$ And