Search Publications
Physical properties of outflows. Comparing CO- and H2O-based parameters in Class 0 sources
Liseau, R.; Melnick, G.; Bjerkeli, P. +4 more
Context. The observed physical properties of outflows from low-mass sources put constraints on possible ejection mechanisms. Historically, these quantities have been derived from CO using ground-based observations. It is, therefore, important to investigate whether parameters such as momentum rate (thrust) and mechanical luminosity (power) are the…
Rotational non-LTE in HCN in the thermosphere of Titan: Implications for the radiative cooling
Hartogh, P.; Rezac, L.; Kutepov, A. A. +2 more
Context. The thermal structure of Titan's thermosphere is determined by the balance between several heating and cooling processes. These processes must be accurately modeled to correctly interpret the available measurements and enhance our understanding of the formation and evolution of this atmosphere. One of the most important thermospheric cool…
A BeppoSAX and XMM-Newton spectral study of 4U 1735-44
Santangelo, A.; Mück, B.; Piraino, S.
Context. Low-mass X-ray binary systems consist of a neutron star and a main-sequence companion star. The compact object accretes matter via Roche-lobe overflow, which leads to an accretion disk. In addition to a broad-band continuum emission of a thermal component and a Comptonization part, evidence for a broad iron Kα line is found in …
Studying the non-thermal lobes of IRAS 16547-4247 through a multi-wavelength approach
Iwasawa, K.; Paredes, J. M.; Munar-Adrover, P. +1 more
In recent years, massive protostars have turned out to be a possible population of high-energy emitters. Among the best candidates is IRAS 16547-4247, a protostar that presents a powerful outflow with clear signatures of interaction with its environment. This source has been revealed to be a potential high-energy source because it displays non-the…
Variability of a stellar corona on a time scale of days. Evidence for abundance fractionation in an emerging coronal active region
Nordon, R.; Behar, E.; Drake, S. A.
Elemental abundance effects in active coronae have eluded our understanding for almost three decades, since the discovery of the first ionization potential (FIP) effect on the sun. The goal of this paper is to monitor the same coronal structures over a time interval of six days and resolve active regions on a stellar corona through rotational modu…
Evidence of quiet-Sun chromospheric activity related to an emerging small-scale magnetic loop
Gömöry, P.; Puschmann, K. G.; Balthasar, H.
Aims: We investigate the temporal evolution of magnetic flux emergence in the quiet-Sun atmosphere close to disk center.
Methods: We combined high-resolution SoHO/MDI magnetograms with TRACE observations taken in the 1216 Å channel to analyze the temporal evolution of an emerging small-scale magnetic loop and its traces in the chromosphe…
Polar plumes' orientation and the Sun's global magnetic field
Inhester, Bernd; de Patoul, Judith; Cameron, Robert
Aims: We characterize the orientation of polar plumes as a tracer of the large-scale coronal magnetic field configuration. We monitor in particular the north and south magnetic pole locations and the magnetic opening during 2007-2008 and provide some understanding of the variations in these quantities.
Methods: The polar plume orientatio…
Star formation in the luminous YSO IRAS 18345-0641
Ramsay, S.; Currie, M. J.; Davis, C. J. +2 more
Aims: We aim to understand the star formation associated with the luminous young stellar object (YSO) IRAS 18345-0641 and to address the complications arising from unresolved multiplicity in interpreting the observations of massive star-forming regions.
Methods: New infrared imaging data at sub-arcsec spatial resolution are obtained for …
A new look at the long-period eclipsing binary V383 Scorpii
Gromadzki, M.; Strobel, A.; Gałan, C. +9 more
Context. The system V383 Sco was discovered to be an eclipsing binary star at the beginning of the twentieth century. This system has one of the longest orbital periods known (13.5 yr) and was initially classified as a ζAur-type eclipsing variable. It was then forgotten about for decades, with no progress made in understanding it.
Aims: This …
Extended-object reconstruction in adaptive-optics imaging: the multiresolution approach
Baena Gallé, R.; Núñez, J.; Gladysz, S.
Aims: We propose the application of multiresolution transforms, such as wavelets and curvelets, to reconstruct images of extended objects that have been acquired with adaptive-optics (AO) systems. Such multichannel approaches normally make use of probabilistic tools to distinguish significant structures from noise and reconstruction residuals…