Search Publications
Variability and Dynamics of the Outer Atmospheric Layers in the Quiet Solar Network
Curdt, W.; Rybák, J.; Gömöry, P. +2 more
A detailed study of the temporal evolution of the chromospheric He I 584.33 Å and the transition region O V 629.73 Å emission line intensities of quiet supergranular network of the Sun near disk centre observed with Coronal Diagnostic Spectrometer (CDS) is presented. A wavelet analysis of the 1729 s (28.8 min) long temporal series was performed in…
Astrophysics: Fingerprints in Saturn's F ring
Hamilton, Douglas P.
A planet's rings can be distorted by the gravitational pull of its satellites, and these complex interactions have been difficult to disentangle. Saturn's moon Prometheus, however, has now been caught returning to the scene of the crime.
Unveiling the nature of the new transient IGR J19140+0951
Petrucci, P. -O.; Rodriguez, J.; Henri, G. +5 more
IGR J19140+0951 was discovered during the first observation campaign of the famous microquasar GRS1915+105 (PI Hannikainen) by INTEGRAL IBIS/ISGRI instrument. The source, which is 1o from GRS1915+105 (corrected position), shows high variations of its X-ray luminosity and spectral variations on timescales from seconds to hours. According…
Long-term variations of the Be star 88 Her
Granada, A.; Cidale, S. L.
Since its discovery as a variable star, 88 Her has undergone three photometric long-term variation cycles with transitions between Be-Shell and normal B phases. From the spectroscopic analysis of fifteen high resolution spectra obtained by the IUE satellite, we found that the radial velocities of Fe II lines follow the orbital cycle of the binary …
Weak lensing studies from space with GEMS [review article]
Heymans, C.; Taylor, A. N.; Wolf, C. +16 more
The Galaxy Evolution from Morphology and SEDs (GEMS) survey is the largest contiguous field ever imaged in colour by HST with the Advanced Camera for Surveys (ACS), spanning some 900 square arcmins in the Chandra deep field south (CDFS). We discuss the power of the ACS for weak lensing studies and present preliminary results from our cosmic shear …
Titan team claims just deserts as probe hits moon of crème brûlée
Abbott, Alison
Catalogue of stars with high proper motions (version 1)
Ivanov, G. A.
A catalogue (astrometric and astrophysical parameters) of 251000 stars with high proper motions (more than 40 mas/year) was compiled using original determinations from FONAK1.0 catalogue, data from the catalogues Hipparcos, Tycho-2, CMC11, PPM, NPM1, NLTT, GCVS, as well as the data from published sources (ftp://ftp.mao.kiev.ua/pub/astro/h-pms.dat)
Analysis of small-scale wave structures in the Saturnian a ring based on data from the Cassini interplanetary spacecraft
Postnikov, E. B.; Loskutov, A. Yu.
Young and Explosive BAL QSOs (at low and high redshifts)
Zheng, W.; Terlevich, R.; Mediavilla, E. +7 more
study of outflow (OF) and BAL systems in QSOs is presented. This study is based mainly on 1D and 3D spectroscopy (obtained at La Palma/WHT, HST, IUE, ESO/NTT, KPNO, APO and CASLEO observatories) plus HST images. In particular, for the nearest BAL QSO Mrk 231, we found clear evidence that the extreme nuclear OF process has at least 3 main and compo…
Multiwavelength Study of two Unidentified γ-ray Sources
Caraveo, Patrizia; La Palombara, Nicola; Bignami, Giovanni F. +3 more
Most counterparts of the identified low-latitude γ-ray sources are isolated neutron stars (INSs). Since INSs are characterized by an extremely high value of f X/f opt, a systematic X-ray/optical coverage of the fields of unidentified low-latitude γ-ray sources is the best way to unveil INS counterparts of unidentified sources…