Speckle observations of double and multiple stars at Pic du Midi: Measurements during 1995 and 1997 and new orbits

Abstract

Abstract. We present speckle observations of 48 double and multiple stars observed with the 2-meter "Télescope Bernard Lyot" (TBL) in December 1995, January 1997 and June 1997. Angular separations, absolute position angles and relative photometry result from these observations. New orbital elements have been recalculated for 8 double stars.

Binary star speckle measurements at Calar Alto. I.

“…Jasinta (1996) Aristidi et al (1999), does not fit well with recent speckle measurements. We tried to adjust the orbital parameters to the latest speckle data, and with these improvements, the orbit seems to be almost definitive.…”

Speckle observations of binary systems measured by Hipparcos

“…1). Although this method was originally developed for photon-counting detectors, we have experienced (Aristidi et al 1999;Scardia et al 2000) that it is still very efficient for the detection and the measurement of the relative positions of double and multiple stars, and it leads to the same results of more elaborated (and time-consuming) methods such as the algorithms using the bispectrum (see Prieur et al 1991).…”

“…Table 6). An exception was made for HIP 11318 and 96840 which belong to the programme of eclipsing systems, HIP 10952, a spectroscopicvisual binary for which -partly thanks to the additional data -new masses have been derived lately by Pourbaix (2000), and HIP 54061 and 58112 for which Aristidi et al (1999) have computed a new orbit. We have re-observed them to check their orbits.…”

“…This work is part of a larger observational program to study a sample of binary systems from the Hipparcos Catalogue in various aspects: morphology, multiplicity, orbits, fundamental stellar parameters, dynamics and evolution (Ribas et al 1998;Aristidi et al 1999;Lastennet et al 1999;Lampens & Strigachev 2000).…”

“…The observations presented here were performed with the 2-meter Bernard Lyot telescope (TBL) of the Pic du Midi Observatory making use of the PISCO speckle camera developed by the Observatoire Midi-Pyrénées (Prieur et al 1994(Prieur et al , 1998 which constitutes a powerful tool for investigating the field of close binary stars (Carbillet et al 1996;Aristidi et al 1997bAristidi et al , 1999. Under normal or good observing conditions, the angular resolution reached by PISCO at the TBL is of the order of 60 milliarcsec in V , which corresponds to the diffraction limit of the telescope.…”