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25 papers · 1 filter
The nearby AGB star L2 Puppis: the birth of a planetary nebula ?
P. Kervella, M. Montargès, E. Lagadec
Adaptive optics observations in the infrared (VLT/NACO, Kervella et al. 2014) and visible (VLT/SPHERE, Kervella et al. 2015) domains revealed that the nearby AGB star L2 Pup (d=64…
The convection of close red supergiant stars observed with near-infrared interferometry
Miguel Montargès, Pierre Kervella, Guy Perrin +2
Our team has obtained observations of the photosphere of the two closest red supergiant stars Betelgeuse ( Ori) and Antares ( Sco) using near infrared interferometry. We have…
Imaging Jupiter's radiation belts down to 127 MHz with LOFAR
J. N. Girard, P. Zarka, C. Tasse +71
Context. Observing Jupiter's synchrotron emission from the Earth remains today the sole method to scrutinize the distribution and dynamical behavior of the ultra energetic electron…
The Araucaria Project: High-precision orbital parallax and masses of the eclipsing binary TZ~Fornacis
A. Gallenne, G. Pietrzyński, D. Graczyk +6
Context: Independent distance estimates are particularly useful to check the precision of other distance indicators, while accurate and precise masses are necessary to constrain ev…
A recent change in the optical and γ-ray polarization of the Crab nebula and pulsar
Paul Moran, Gillian Kyne, Christian Gouiffes +5
We report on observations of the polarization of optical and γ-ray photons from the Crab nebula and pulsar system using the Galway Astronomical Stokes Polarimeter (GASP), the Hubbl…
Investigating Cepheid Carinae's Cycle-to-cycle Variations via Contemporaneous Velocimetry and Interferometry
R. I. Anderson, A. Mérand, P. Kervella +8
Baade-Wesselink-type (BW) techniques enable geometric distance measurements of Cepheid variable stars in the Galaxy and the Magellanic clouds. The leading uncertainties involved co…