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10 papers · 2 filters
CS 22957-027: A carbon-rich extremely-metal-poor star
P. Bonifacio, P. Molaro, T. C. Beers +1
We present a high-resolution spectroscopic analysis of the extremely-metal-poor star CS 22957-027, which Beers et al (1992) noted to exhibit a rather strong G-band. For Teff = 4839…
A study of the core of the Shapley Concentration: III. Properties of the clusters in the A3558 complex
S. Bardelli, E. Zucca, G. Zamorani +2
The Shapley Concentration is the richest supercluster of clusters in the nearby universe and its core is a remarkable complex formed by the ACO clusters A3558, A3562 and A3556, and…
Chemical abundances in the young galaxy at z=2.309 towards PHL 957
Paolo Molaro, Miriam Centurion, Giovanni Vladilo
We present high-resolution UES spectra of the quasar PHL 957 obtained for studying the foreground Damped Ly-alpha galaxy at z=2.309. Measurements of absorption lines lead to accura…
The Near- and Mid-Infrared Continuum Emission of Seyfert Nuclei: Constraints on the Models of Obscuring Tori
Dario Fadda, Giuliano Giuricin, Gian Luigi Granato +1
For an extended sample of Seyfert galaxies we compile from the literature the infrared fluxes in the four IRAS bands, the ground-based small-beam (~ 5-10") fluxes in the standard Q…
Dust and elemental abundances in Damped Ly alpha absorbers
Giovanni Vladilo
The effects of the dust on the determination of elemental abundances in damped Ly alpha (DLA) absorbers are investigated. Relations between the observed abundances measured in the…
Neutral sodium from comet Hale-Bopp: a third type of tail
G. Cremonese, H. Boehnhardt, J. Crovisier +7
We report on the discovery and analysis of a striking neutral sodium gas tail associated with comet C/1995 O1 Hale-Bopp. Sodium D-line emission has been observed at heliocentric di…