Search Publications
Study of the many fluorescent lines and the absorption variability in GX 301-2 with XMM-Newton
Wilms, J.; Ferrigno, C.; Pottschmidt, K. +7 more
We present an in-depth study of the high mass X-ray binary (HMXB) GX 301-2 during its pre-periastron flare using data from the XMM-Newton satellite. The energy spectrum shows a power law continuum absorbed by a large equivalent hydrogen column on the order of 1024 cm-2 and a prominent Fe Kα fluorescent emission line. Besides …
Multi-instrument X-ray monitoring of the January 2009 outburst from the recurrent magnetar candidate 1E 1547.0-5408
Campana, S.; Tiengo, A.; Götz, D. +9 more
Context. With two consecutive outbursts recorded in four months (October 2008 and January 2009), and a possible third outburst in 2007, 1E 1547.0-5408 is one of the most active transient anomalous X-ray pulsars known so far.
Aims: Thanks to extensive X-ray observations, obtained both in the quiescent and active states, 1E 1547.0-5408 represen…
First stars. XV. Third-peak r-process element and actinide abundances in the uranium-rich star CS31082-001
Bonifacio, P.; Spite, M.; Nordström, B. +12 more
Context. A small fraction of extremely metal-poor (EMP) stars exhibit moderate to extreme excesses of heavy neutron-capture elements produced in the r-process. The production site(s) of these elements in the early Galaxy remain(s) unclear, as is the reason for their occasional enhancement in the otherwise regular pattern of abundances of elements …
A high-resolution three-dimensional model of the solar photosphere derived from Hinode observations
Socas-Navarro, H.
A new three-dimensional model of the solar photosphere is presented in this paper and made publicly available to the community. This model has the peculiarity of having been obtained by inverting spectro-polarimetric observations, rather than by using numerical radiation hydrodynamical simulations. The data used here are from the spectro-polarimet…
Multi-wavelength modeling of the spatially resolved debris disk of HD 107146
Ertel, S.; Wolf, S.; Carpenter, J. M. +5 more
Aims: We aim to constrain the location, composition, and dynamical state of planetesimal populations and dust around the young, sun-like (G2 V) star
Methods: We consider coronagraphic observations obtained with the Advanced Camera for Surveys (HST/ACS) onboard the Hubble Space Telescope (HST) in broad V (λ
The continuum intensity as a function of magnetic field. I. Active region and quiet Sun magnetic elements
Solanki, S. K.; Borrero, J. M.; Kobel, P.
Context. Small-scale magnetic fields are major contributors to the solar irradiance variations. Hence, the continuum intensity contrast of magnetic elements in the quiet Sun (QS) network and in active region (AR) plage is an essential quantity that needs to be measured reliably.
Aims: By using Hinode/SP disk center data at a constant, high sp…
Herschel discovery of a new class of cold, faint debris discs
Heras, A. M.; Fridlund, M.; Krivov, A. V. +25 more
We present Herschel PACS 100 and 160 µm observations of the solar-type stars α Men, HD 88230 and HD 210277, which form part of the FGK stars sample of the Herschel open time key programme (OTKP) DUNES (DUst around NEarby Stars). Our observations show small infrared excesses at 160 µm for all three stars. HD 210277 also shows a small ex…
Herschel's view into Mira's head
Blommaert, J. A. D. L.; Jorissen, A.; Ottensamer, R. +9 more
Herschel's PACS instrument observed the environment of the binary system Mira Ceti in the 70 and 160 µm bands. These images reveal bright structures shaped as five broken arcs and fainter filaments in the ejected material of Mira's primary star, the famous AGB star o Ceti. The overall shape of the IR emission around Mira deviates significant…
Can coronal hole spicules reach coronal temperatures?
Doyle, J. G.; Madjarska, M. S.; Vanninathan, K.
Aims: The present study aims to provide observational evidence of whether coronal hole spicules reach coronal temperatures.
Methods: We combine multi-instrument co-observations obtained with the SUMER/SoHO and with the EIS/SOT/XRT/Hinode.
Results: The analysed three large spicules were found to be comprised of numerous thin spicules…
A mid-IR study of Hickson compact groups. II. Multiwavelength analysis of the complete GALEX-Spitzer sample
Le Floc'h, E.; Magdis, G.; da Cunha, E. +3 more
We present a comprehensive study of the impact of the environment of compact galaxy groups on the evolution of their members using a multiwavelength analysis from the ultraviolet to the infrared, for a sample of 32 Hickson compact groups (HCGs) containing 135 galaxies. Fitting the spectral energy distributions (SEDs) of all galaxies with the state…