Search Publications
INPOP08, a 4-D planetary ephemeris: from asteroid and time-scale computations to ESA Mars Express and Venus Express contributions
Laskar, J.; Fienga, A.; Le Poncin-Lafitte, C. +6 more
The latest version of the planetary ephemerides developed at the Paris Observatory and at the Besançon Observatory is presented. INPOP08 is a 4-dimension ephemeris since it provides positions and velocities of planets and the relation between Terrestrial Time and Barycentric Dynamical Time. Investigations to improve the modeling of asteroids are d…
Parameters of Herbig Ae/Be and Vega-type stars
Eiroa, C.; Montesinos, B.; Mora, A. +1 more
Context: This work presents the characterization of 27 young early-type stars, most of them in the age range 1-10 Myr, and three suspected hot companions of post-T Tauri stars belonging to the Lindroos binary sample. Most of these objects show IR excesses in their spectral energy distributions, which are indicative of the presence of disks. The wo…
The dust condensation sequence in red supergiant stars
Eriksson, K.; Hony, S.; Decin, L. +3 more
Context: Red supergiant (RSG) stars exhibit significant mass loss by means of a slow, dense wind. They are often considered to be the more massive counterparts of Asymptotic Giant Branch (AGB) stars. While AGB mass loss is related to their strong pulsations, the RSG are often only weakly variable. This raises the question of whether their wind-dri…
The redshift and afterglow of the extremely energetic gamma-ray burst GRB 080916C
Cenko, S. B.; Greiner, J.; Berger, E. +22 more
Context: The detection of GeV photons from gamma-ray bursts (GRBs) has important consequences for the interpretation and modelling of these most-energetic cosmological explosions. The full exploitation of the high-energy measurements relies, however, on accurate knowledge of the distance to the events.
Aims: Here we report on the discovery of …
An optical spectroscopic survey of the 3CR sample of radio galaxies with z < 0.3. I. Presentation of the data
Macchetto, F. D.; Capetti, A.; Sparks, W. B. +4 more
We present a homogeneous and 92% complete dataset of optical nuclear spectra for the 113 3CR radio sources with redshifts <0.3, obtained with the Telescopio Nazionale Galileo. For these sources we could obtain uniform and uninterrupted coverage of the key spectroscopic optical diagnostics. The observed sample, including powerful classical FR II…
HD 50844: a new look at δ Scuti stars from CoRoT space photometry
Auvergne, M.; Amado, P. J.; Baudin, F. +21 more
Context:
Aims: This work presents the results obtained by CoRoT on HD 50844, the only δ Sct star observed in the CoRoT initial run (57.6 d). The aim of these CoRoT observations was to investigate and characterize for the first time the pulsational behaviour of a δ Sct star, when observed at a level of precision and with a much better duty cycl…
Radial distribution of the multiple stellar populations in ω Centauri
Anderson, J.; Milone, A. P.; Momany, Y. +4 more
Aims: We present a detailed study of the radial distribution of the multiple populations identified in the Galactic globular cluster ω Cen.
Methods: We used both space-based images (ACS/WFC and WFPC2) and ground-based images (FORS1@VLT and WFI@2.2m ESO telescopes) to map the cluster from the inner core to the outskirts ( 20 arcmin). These data…
Ground-based CCD astrometry with wide field imagers. III. WFI@2.2m proper-motion catalog of the globular cluster ω Centauri
Moretti, A.; Anderson, J.; Milone, A. P. +6 more
Context: ω Centauri is the most well studied Galactic Globular Cluster because of its numerous puzzling features: significant dispersion in metallicity, multiple populations, triple main-sequence, horizontal branch morphology, He-rich population(s), and extended star-formation history. Intensive spectroscopic follow-up observing campaigns targetin…
Strong [CII] emission at high redshift
Maiolino, R.; Meneghetti, M.; De Breuck, C. +3 more
We report the detection of the [Cii]157.74 µm fine-structure line in the lensed galaxy BRI 0952-0115 at z=4.43, using the APEX telescope. This is the first detection of the [Cii] line in a source with L_FIR < 1013~L_⊙ at high redshift. The line is much stronger than previous [Cii] detections at high-z (a factor of 5-8 higher in…
Suzaku measurement of Abell 2204's intracluster gas temperature profile out to 1800 kpc
Zhang, Y. -Y.; Ishisaki, Y.; Fujita, Y. +6 more
Context: Measurements of intracluster gas temperatures out to large radii, where much of the galaxy cluster mass resides, are important for using clusters for precision cosmology and for studies of cluster physics. Previous attempts to measure robust temperatures at cluster virial radii have failed.
Aims: The goal of this work is to measure th…