670 citations
- Centre National de la Recherche ScientifiqueFR223 papers
- Université Paris CitéFR153 papers
- Laboratoire d’Etudes du Rayonnement et de la Matière en Astrophysique et AtmosphèresFR126 papers
- Sorbonne UniversitéFR115 papers
- Laboratoire d’études spatiales et d’instrumentation en astrophysiqueFR113 papers
- Galaxies, Etoiles, Physique et InstrumentationFR99 papers
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13 papers · 2 filters
Radiodetection of Cosmic Ray Extensive Air Showers
D. Ardouin, A. Belletoile, D. Charrier +12
We present the characteristics and performance of a demonstration experiment devoted to the observation of ultra high- energy cosmic ray extensive air showers using a radiodetectio…
Determination of stellar rotation with Gaia and effects of spectral mismatch
A. Gomboc, D. Katz
Stellar spectra obtained with Radial Velocity Spectrometer on-board Gaia will enable determination of projected rotational velocities (v sin i) from rotational broadening of spectr…
The Metallicity dependence of the Cepheid Period-Luminosity relation: methodology and results
Marta Mottini, Martino Romaniello, Francesca Primas +3
We present the results of an observational campaign undertaken to assess the influence of the iron content on the Cepheid Period-Luminosity relation. Our data indicate that this de…
X-ray Variability of AGN and the Flare Model
R. W. Goosmann, B. Czerny, A. -M. Dumont +2
Short-term variability of X-ray continuum spectra has been reported for several Active Galactic Nuclei. Significant X-ray flux variations are observed within time scales down to 10…
New analysis of the two carbon-rich stars CS 22948-27 and CS 29497-34 : binarity and neutron-capture elements
B. Barbuy, M. Spite, F. Spite +4
We have carried out a new determination of abundances in the very metal-poor CH/CN strong stars CS 29497-34 and CS 22948-27, using high-resolution spectra obtained with the HARPS s…
First stars VI - Abundances of C, N, O, Li, and mixing in extremely metal-poor giants. Galactic evolution of the light elements
M. Spite, R. Cayrel, B. Plez +11
We have investigated the poorly-understood origin of nitrogen in the early Galaxy by determining N abundances in 35 extremely metal-poor halo giants (22 stars have [Fe/H]<-3.0) usi…