4 papers · 1 filter
Metal abundance of the eclipsing binary YZ Cas: discrepancy between atmospheric determinations for the Am component
E. Lastennet, D. Valls-Gabaud, C. Jordi
We review current and new estimates of the eclipsing binary YZ Cassiopeiae metallicity (Z). Since the individual components cover a quite large range of mass (1.35-2.31 Solar masse…
Euler, Hipparcos and the five dwarfs : Reconstructing star formation histories in the Local Group
David Valls-Gabaud, Xavier Hernandez, Gerry Gilmore
The unprecedented quality of recent colour-magnitude diagrams of resolved stellar populations in nearby galaxies requires state-of-the-art techniques to infer the star formation hi…
Stringent constraints on single-star evolution theory from masses and radii of well-detached binaries in star clusters
E. Lastennet, D. Valls-Gabaud, E. Oblak
Which sample of objects can give strong constraints on single-star evolution theory ? Whilst star cluster members share the same age and the same metallicity, many questions (e.g.…
ROSAC: Studying the clustering properties of X-ray selected AGNs
F. Tesch, F. J. Carrera, D. Engels +6
We present the first ROSAC results of an AGN clustering analysis. This study comprises a sample of 200 AGNs, 75% of which being at low redshifts z<0.5, in the Ursa Major constellat…