Paul Felenbok

Introduction to MIOSOTYS: a multiple-object, high-speed photometer

MIOSOTYS is a multiple-object, high-speed photometer. It is currently operating on the 1.93m telescope at Observatoire de Haute-Provence (OHP), France. The instrument consists of a multi-fibre positioner which can access maximum 29 targets simultaneously, and an EMCCD camera which is capable of recording low-level light at high frame rate. This paper will describes the instruments specifications as well as the performance, i.e., signal-to-noise ratio, under the current configuration (ProEM CCD + 1.93m telescope).

FUEGOS status report

The FUEGOS multi-object area spectrograph will be one of the six instruments of the first generation for the very large telescope. It will be installed on one of the Nasmyth platforms of the telescope unit 3 at the beginning of the year 2001. The instrument includes a multi-object fiber linked spectrograph to observe simultaneously up 80 targets and a fiber anamorphoser for two-dimensional spectroscopy of extended objects. Description of the instrument, its performances and status of the project are reported in this paper.

Multiobject spectroscopy with MEFOS at ESO

The MEFOS instrument is being regularly used at the ESO 3.6m telescope for multi-object spectroscopy. The instrument can access up to 29 targets at the 1 degree field of the prime focus. The 21m fiber bundle links a low resolution spectrograph located in the Cassegrain cage. MEFOS has been also used to evaluate the sky subtraction with optical fibers. This paper reports on the description of the final configuration of the instrument and on its performance. A brief study on the photometric and spectral stability of fibers along with the observations is also reported.

A Bench Fiber Fed Spectrograph for Stellar Line Variability Studies

We present a fiber fed spectrograph linked to a 2m telescope for stellar line variability observations. We use a 133µm silica-silica FOI fiber with or without a glass fiber image slicer. The optical design is of the Czerny-Turner perpendicular type and uses a parabolic collimator on axis. The optical quality, tested on photograph plate, leads to a spectral resolution of 6xl04. With a CCD, our regular detector, the resolutions are 104and 3.5xl04. We use this instrument for multiple site observations on the same star, and we present variability results on Herbig Ae stars obtained in France, Lick and Hawaii.