Context. Betelgeuse is the closest red supergiant (RSG), therefore it is well suited to study the complex processes in its atmosphere that lead to the chemical enrichment of the interstellar medium. Aims. We intend to investigate the shape and composition of the close molecular layer (also known as the MOLsphere) that surrounds the star. This...
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November 21, 2014 (v1)Journal articleUploaded on: March 25, 2023
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April 10, 2014 (v1)Journal article
As the nearest known AGB star (d=64pc) and one of the brightest (mK~-2), L2 Pup is a particularly interesting benchmark object to monitor the final stages of stellar evolution. We report new lucky imaging observations of this star with the VLT/NACO adaptive optics system in twelve narrow band filters covering the 1.0-4.0 microns wavelength...
Uploaded on: December 3, 2022 -
April 10, 2014 (v1)Journal article
As the nearest known AGB star (d=64pc) and one of the brightest (mK~-2), L2 Pup is a particularly interesting benchmark object to monitor the final stages of stellar evolution. We report new lucky imaging observations of this star with the VLT/NACO adaptive optics system in twelve narrow band filters covering the 1.0-4.0 microns wavelength...
Uploaded on: October 11, 2023 -
August 21, 2007 (v1)Journal article
The study of the atmosphere of red supergiant stars in general and of Betelgeuse (alpha Orionis) in particular is of prime importance to understand dust formation and how mass is lost to the interstellar medium in evolved massive stars. A molecular shell, the MOLsphere (Tsuji, 2000a), in the atmosphere of Betelgeuse has been proposed to account...
Uploaded on: December 3, 2022 -
August 1, 2014 (v1)Conference paper
International audience
Uploaded on: December 3, 2022 -
2004 (v1)Journal article
Recently available near-infrared interferometric data on late-type stars show a strong increase of diameter for asymptotic giant branch (AGB) stars between the K (2.0{-}2.4 mum) and L (3.4{-}4.1 mum) bands. Aiming at an explanation of these findings, we chose the objects alpha Orionis (Betelgeuse), SW Virginis, and R Leonis, which are of...
Uploaded on: December 3, 2022 -
June 10, 2018 (v1)Conference paper
International audience
Uploaded on: December 3, 2022 -
June 25, 2008 (v1)Publication
Context: The main sequence binary star 61 Cyg (K5V+K7V) is our nearest stellar neighbour in the northern hemisphere. This proximity makes it a particularly well suited system for very high accuracy interferometric radius measurements. Aims: Our goal is to constrain the poorly known evolutionary status and age of this bright binary star....
Uploaded on: December 4, 2022 -
June 23, 2008 (v1)Conference paper
We describe the present status of the development of a very high-dynamic range, diffraction limited imaging instrument FIRST (Fibered Imager foR Single Telescope), among which goals is the detection of nearby extra-solar planets at visible to near-infrared wavelengths from the ground. We have started to develop a prototype system which consists...
Uploaded on: December 3, 2022 -
December 14, 2020 (v1)Conference paper
International audience
Uploaded on: December 3, 2022 -
December 14, 2020 (v1)Conference paper
The CHARA Array is the longest baseline optical interferometer in the world. Operated with natural seeing, it has delivered landmark sub-milliarcsecond results in the areas of stellar imaging, binaries, and stellar diameters. However, to achieve ambitious observations of faint targets such as young stellar objects and active galactic nuclei,...
Uploaded on: February 22, 2023 -
December 14, 2020 (v1)Conference paper
The CHARA Array is the longest baseline optical interferometer in the world. Operated with natural seeing, it has delivered landmark sub-milliarcsecond results in the areas of stellar imaging, binaries, and stellar diameters. However, to achieve ambitious observations of faint targets such as young stellar objects and active galactic nuclei,...
Uploaded on: December 4, 2022 -
July 2018 (v1)Conference paper
Despite recent advancements, many fundamental questions still surround the processes that are involved in planetary birth: Where in the protoplanetary disk do the planets form and how do they grow? What factors determine the final architecture of planetary systems? How are water and other volatiles delivered to the protoplanets and how does...
Uploaded on: December 3, 2022