Search Publications
The Gaia DR2 view of the Gamma Velorum cluster: resolving the 6D structure
Fedele, D.; Franciosini, E.; Randich, S. +4 more
Gaia-ESO Survey observations of the young Gamma Velorum cluster led to the discovery of two kinematically distinct populations, Gamma Vel A and B, respectively, with population B extended over several square degrees in the Vela OB2 association. Using the Gaia DR2 data for a sample of high-probability cluster members, we find that the two populatio…
Super-Earth of 8 M⊕ in a 2.2-day orbit around the K5V star K2-216
Kuzuhara, M.; Erikson, A.; Fridlund, M. +37 more
Context. Although thousands of exoplanets have been discovered to date, far fewer have been fully characterised, in particular super-Earths. The KESPRINT consortium identified K2-216 as a planetary candidate host star in the K2 space mission Campaign 8 field with a transiting super-Earth. The planet has recently been validated as well.
Aims: …
The CARMENES search for exoplanets around M dwarfs. Nine new double-line spectroscopic binary stars
Nagel, E.; Amado, P. J.; Caballero, J. A. +27 more
Context. The CARMENES spectrograph is surveying ∼300 M dwarf stars in search for exoplanets. Among the target stars, spectroscopic binary systems have been discovered, which can be used to measure fundamental properties of stars.
Aims: Using spectroscopic observations, we determine the orbital and physical properties of nine new double-line s…
The AKARI IRC asteroid flux catalogue: updated diameters and albedos
Müller, T. G.; Usui, F.; Alí-Lagoa, V. +1 more
The AKARI IRC all-sky survey provided more than twenty thousand thermal infrared observations of over five thousand asteroids. Diameters and albedos were obtained by fitting an empirically calibrated version of the standard thermal model to these data. After the publication of the flux catalogue in October 2016, our aim here is to present the AKAR…
Aluminium abundances in five discrete stellar populations of the globular cluster NGC 2808
D'Orazi, Valentina; Bragaglia, Angela; Carretta, Eugenio +3 more
We observed a sample of 90 red giant branch (RGB) stars in NGC 2808 using FLAMES/GIRAFFE and the high resolution grating with the set-up HR21. These stars have previous accurate atmospheric parameters and abundances of light elements. We derived aluminium abundances for them from the strong doublet Al i 8772-8773 Å as in previous works of our grou…
Planets, candidates, and binaries from the CoRoT/Exoplanet programme. The CoRoT transit catalogue
Mazeh, T.; Guterman, P.; Aigrain, S. +31 more
The CoRoT space mission observed 163 665 stars over 26 stellar fields in the faint star channel. The exoplanet teams detected a total of 4123 transit-like features in the 177 454 light curves. We present the complete re-analysis of all these detections carried out with the same softwares so that to ensure their homogeneous analysis. Although the v…
MUSE crowded field 3D spectroscopy in NGC 300. I. First results from central fields
Bacon, Roland; Weilbacher, Peter M.; Monreal-Ibero, Ana +9 more
Aims: As a new approach to the study of resolved stellar populations in nearby galaxies, our goal is to demonstrate with a pilot study in NGC 300 that integral field spectroscopy with high spatial resolution and excellent seeing conditions reaches an unprecedented depth in severely crowded fields.
Methods: Observations by MUSE with seven…
The Kepler view of magnetic chemically peculiar stars
Paunzen, E.; Bernhard, K.; Hümmerich, S. +6 more
Context. Magnetic chemically peculiar (mCP) stars exhibit complex atmospheres that allow the investigation of such diverse phenomena as atomic diffusion, magnetic fields, and stellar rotation. The advent of space-based photometry provides the opportunity for the first precise characterizations of the photometric variability properties of these sta…
Hot stars observed by XMM-Newton. II. A survey of Oe and Be stars
Nazé, Yaël; Motch, Christian
We perform a survey of Oe and Be stars in the X-ray range. To this aim, we cross-correlated XMM-Newton and Chandra catalogs of X-ray sources with a list of Be stars, finding 84 matches in total. Of these, 51 objects had enough counts for a spectral analysis. This paper provides the derived X-ray properties (X-ray luminosities, and whenever possibl…
NGC 300 ULX1: A test case for accretion torque theory
Haberl, F.; Vasilopoulos, G.; Maitra, C. +1 more
NGC 300 ULX1 is a newly identified ultra-luminous X-ray pulsar. The system is associated with the supernova impostor SN 2010da that was later classified as a possible supergiant Be X-ray binary. In this work we report on the spin period evolution of the neutron star based on all the currently available X-ray observations of the system. We argue th…