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Multiplicity of Galactic Cepheids from long-baseline interferometry. II. The Companion of AX Circini revealed with VLTI/PIONIER
A. Gallenne, A. Mérand, P. Kervella +6
Aims: We aim at detecting and characterizing the main-sequence companion of the Cepheid AX Cir ( 18 yrs). The long-term objective is to estimate the mass of b…
The close environment of high-mass X-ray binaries at high angular resolution I. VLTI/AMBER and VLTI/PIONIER near-infrared interferometric observations of Vela X-1
E. Choquet, P. Kervella, J. -B. Le Bouquin +7
Recent improvements on the sensitivity and spectral resolution of X-ray observations have led to a better understanding of the properties of matter in the vicinity of High Mass X-r…
Binary Cepheids from optical interferometry
A. Gallenne, P. Kervella, A. Mérand +3
Classical Cepheid stars have been considered since more than a century as reliable tools to estimate distances in the universe thanks to their Period-Luminosity (P-L) relationship.…
Extended envelopes around Galactic Cepheids IV. T Monocerotis and X Sagittarii from mid-infrared interferometry with VLTI/MIDI
A. Gallenne, A. Merand, P. Kervella +3
Aims. We study the close environment of nearby Cepheids using high spatial resolution observations in the mid-infrared with the VLTI/MIDI instrument, a two-beam interferometric rec…
Astrometric detection of exoplanets from the ground
J. Sahlmann, P. F. Lazorenko, A. Mérand +3
Astrometry is a powerful technique to study the populations of extrasolar planets around nearby stars. It gives access to a unique parameter space and is therefore required for obt…
An interferometric view on binarity and circumstellar envelopes of Cepheids
A. Gallenne, P. Kervella, A. Mérand +4
Optical interferometry is the only technique giving access to milli-arcsecond (mas) resolution at infrared wavelengths. For Cepheids, this is a powerful and unique tool to detect t…