Search Publications
Heavy absorption and soft X-ray emission lines in the XMM-Newton spectrum of the type 2 radio-loud quasar 3C 234
Fiore, F.; Bianchi, S.; Guainazzi, M. +4 more
Aims:We report results on a 40 ks XMM-Newton observation of the type 2 quasar 3C 234. Optical spectropolarimetric data have demonstrated the presence of a hidden broad-line region in this powerful (MV ≤ -24.2 after reddening and starlight correction) narrow-line FRII radio galaxy. Our analysis is aimed at investigating the X-ray spectra…
A solar burst with a spectral component observed only above 100 GHz during an M class flare
Mandrini, C. H.; Giménez de Castro, C. G.; Cristiani, G. +4 more
Context: Since the installation of submillimeter solar radio telescopes, a new spectral burst component was discovered at frequencies above 100 GHz, creating the THz burst category. In all the reported cases, the events were X-class flares and the THz component was increasing.
Aims: We report for the first time an M class flare that shows a di…
Follow-up observations of binary ultra-cool dwarfs
Martín, E. L.; Huélamo, N.; Bouy, H. +12 more
Context: Astrometric observations of resolved binaries provide estimates of orbital periods and will eventually lead to measurement of dynamical masses. Only a few very low mass star and brown dwarf masses have been measured to date, and the mass-luminosity relation still needs to be calibrated.
Aims: We have monitored 14 very low mass multipl…
Discovery of ultra-compact nuclear rings in three spiral galaxies
Knapen, J. H.; Comerón, S.; Beckman, J. E. +1 more
Ring-shaped morphologies of nuclear star-forming regions within the central 40{-}200 pc of disk galaxies have been barely resolved so far in three composite Sy 2 nuclei, the Sy 2 Circinus galaxy and in three non-AGN galaxies. Such morphologies resemble those of the standard 1 kpc-size nuclear rings that lie in the inner Lindblad resonance regions …
FUSE spectroscopy of the sdOB primary of the post common-envelope binary LB 3459 (AA Doradus )
Rauch, T.; Werner, K.; Kruk, J. W. +1 more
Context:
Resolving stellar populations outside the Local Group: MAD observations of UKS 2323-326
Gullieuszik, M.; Moretti, A.; Falomo, R. +14 more
Aims: We present a study aimed at deriving constraints on star formation at intermediate ages from the evolved stellar populations in the dwarf irregular galaxy UKS 2323-326. These observations were also intended to demonstrate the scientific capabilities of the multi-conjugated adaptive optics demonstrator (MAD) implemented at the ESO Very Large …
Abundances of planetary nebulae NGC 3242 and NGC 6369
Pottasch, S. R.; Bernard-Salas, J.
The spectra of the planetary nebulae
AG Draconis observed with XMM-Newton
Bernabei, S.; Rossi, C.; Frasca, A. +5 more
Context:
Aims: Study of the X-ray spectrum of this peculiar binary system, covering both quiescence and activity periods, is necessary to investigate the physics of the high temperature spectral component, and…
Asiago eclipsing binaries program. II. V505 Persei
Munari, U.; Zwitter, T.; Sordo, R. +4 more
The orbit and fundamental physical parameters of the double-lined eclipsing binary V505 Per are derived by means of Echelle high-resolution and high S/N spectroscopy, and B, V photometry. In addition, effective temperatures, gravities, rotational velocities, and metallicities of both components are also obtained from atmospheric χ2 anal…
New astrometric observations of Phobos with the SRC on Mars Express
Jaumann, R.; Oberst, J.; Matz, K. -D. +5 more
Aims: New astrometric measurements for Phobos are reported on the basis of 69 SRC (Super Resolution Channel) images obtained during 28 Mars Express Phobos flybys executed between 2004 and 2007.
Methods: The measurements have been made using a newly developed technique that involves positional measurements of surface control points and verifica…