title: Dispersed fringe tracking with the multi-r(0) apertures of the Grand Interféromètre à 2 Télescopes.
abstract: A new fringe tracker based on photon-counting detectors and real-time image processing has been implemented on the Grand Interféromètre à 2 Télescopes at the Observatoire de la Cote d'Azur. Fringe visibilities have been recorded on P Cygni and other stars across the Hαemission line with optical path differences stabilized to between 4 and 7 µm rms (1% of the coherence length). We present our initial results and describe the principle, implementation, and performance of the fringe tracker.
authors.forename: L
authors.initials: L
authors.lastname: Koechlin
authors.forename: P R
authors.initials: PR
authors.lastname: Lawson
authors.forename: D
authors.initials: D
authors.lastname: Mourard
authors.forename: A
authors.initials: A
authors.lastname: Blazit
authors.forename: D
authors.initials: D
authors.lastname: Bonneau
authors.forename: F
authors.initials: F
authors.lastname: Morand
authors.forename: P
authors.initials: P
authors.lastname: Stee
authors.forename: I
authors.initials: I
authors.lastname: Tallon-Bosc
authors.forename: F
authors.initials: F
authors.lastname: Vakili