Search Publications
Stellar abundances and ages for metal-rich Milky Way globular clusters. Stellar parameters and elemental abundances for 9 HB stars in NGC 6352
Primas, F.; Feltzing, S.; Johnson, R. A.
Context: Metal-rich globular clusters provide important tracers of the formation of our Galaxy. Moreover, and not less important, they are very important calibrators for the derivation of properties of extra-galactic metal-rich stellar populations. Nonetheless, only a few of the metal-rich globular clusters in the Milky Way have been studied using…
Revealing the fastest component of the DG Tauri outflow through X-rays
Günther, H. M.; Matt, S. P.; Li, Z. -Y.
Context: Some T Tauri stars show a peculiar X-ray spectrum that can be modelled by two components with different absorbing column densities.
Aims: We seek to explain the soft X-ray component in DG Tau, the best studied of these sources, with an outflow model, taking observations at other wavelengths into consideration.
Methods: We constrai…
Swift follow-up observations of 17 INTEGRAL sources of uncertain or unknown nature
Chaty, S.; Tomsick, J. A.; Rodriguez, J.
Context: The positional accuracy of the IBIS telescope on-board INTEGRAL, albeit unprecedented in the >20 keV range, is still not good enough to identify many hard X-ray sources discovered by INTEGRAL. This indeed prevents counterparts from being found at other wavelengths, which is the only way to unveil the true nature of these sources.
A…
High energy variability of 3C 273 during the AGILE multiwavelength campaign of December 2007-January 2008
Caraveo, P. A.; Antonelli, L. A.; Costa, E. +52 more
Context: We report the results of a 3-week multi-wavelength campaign targeting the flat spectrum radio quasar 3C 273 carried out with the AGILE gamma-ray mission, covering the 30 MeV-50 GeV and 18-60 keV, the REM observatory (covering the near-IR and optical), Swift (near-UV/Optical, 0.2-10 keV and 15-50 keV), INTEGRAL (3-200 keV) and Rossi XTE (2…
VLT/NACO coronagraphic observations of fine structures in the disk of β Pictoris
Augereau, J. -C.; Pantin, E.; Boccaletti, A. +2 more
Aims: We present ground-based observations of the disk around the A-type star β Pictoris to obtain scattered light images at the highest angular resolution (60 mas, equivalent to about 1 AU at the distance of the star) and the highest contrast in the very close environment of the star. The purpose of this program is to perform a close inspection o…
Mesoscale dynamics on the Sun's surface from HINODE observations
Roudier, Th.; Malherbe, J. M.; Meunier, N. +5 more
Context:
Aims: The interactions of velocity scales on the Sun's surface, from granulation to supergranulation are still not understood, nor are their interaction with magnetic fields. We thus aim at giving a better description of dynamics in the mesoscale range which lies between the two scales mentioned above.
Methods: We analyse a 48 h h…
Accurate classification of 17 AGNs detected with Swift/BAT
Palazzi, E.; Minniti, D.; Masetti, N. +16 more
Through an optical campaign performed at 5 telescopes located in the northern and the southern hemispheres, plus archival data from two on line sky surveys, we have obtained optical spectroscopy for 17 counterparts of suspected or poorly studied hard X-ray emitting active galactic nuclei (AGNs) detected with Swift/BAT in order to determine or bett…
A planet around the evolved intermediate-mass star HD 110014
Pasquini, L.; de Medeiros, J. R.; Hatzes, A. P. +5 more
Context: We found evidence for a sub-stellar companion around the K giant star HD 110014. This cool evolved star, with a spectral type K2III and an estimated mass between 1.9 and 2.4 M⊙, is slightly metal rich with [Fe/H] = 0.19 and a rotational velocity V sin i = 2.0 km s-1.
Aims: To search for extrasolar planets around …
XMM-Newton RGS spectrum of RX J0720.4-3125: an absorption feature at 0.57 keV
Haberl, F.; Neuhäuser, R.; Hohle, M. M. +2 more
Aims: By measuring the gravitational redshift of spectral features in the spectrum of thermal radiation emitted from neutron stars, useful constraints for the equation of state of superdense matter can be obtained via an estimate of the mass-to-radius ratio. We searched for spectral line features in the high-resolution X-ray spectrum of the isolat…
New visible spectra and mineralogical assessment of (21) Lutetia, a target of the Rosetta mission
Lazzarin, M.; Marchi, S.; Magrin, S. +1 more
The Rosetta spacecraft, launched on March 2nd 2004, in the course of its journey to the comet 67P/Churyumov-Gerasimenko (encounter foreseen in 2014), will fly past two asteroids: (2867) Steins and (21) Lutetia. On September 5th 2008 (2867) Steins was encountered. In this paper, we present two visible spectra of (21) Lutetia of different spectral r…