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UV radiation as biologic limit in the origin and development of life in extrasolar planets
Buccino, A. P.; Mauas, P. J. D.; Lemarchand, G. A.
In this work, we displayed a new biological criterion that restricts the traditional habitable zone. We set the internal boundary of this new UV habitable zone from the maximum radiation that tolerates the DNA and its external boundary from the levels of UV radiation needed in the biogenesis processes. We also analyzed the evolution of the habitab…
The accretion/ejection paradigm of low mass stars tested with HST
Ray, T. P.; Eislöffel, J.; Bacciotti, F. +2 more
In the last few years new investigation techniques have allowed us to study in depth the spectacular phenomenon of protostellar jets, and to test the validity of the proposed models for their acceleration. In this contribution we review the current knowledge on the subject, with a special emphasis on the recent achievements obtained thanks to obse…
The astrobiological aspects of Titan: A new vision from Cassini-Huygens
Israel, G.; Owen, T.; Raulin, F. +1 more
Electron pitch angle variations recorded at the high magnetic latitude boundary layer by the NUADU instrument on the TC-2 spacecraft
Barabash, S.; Gunell, H.; Brinkfeldt, K. +16 more
The NUADU (NeUtral Atom Detector Unit) experiment aboard TC-2 recorded, with high temporal and spatial resolution, 4π solid angle images of electrons (~50-125 keV) spiraling around geomagnetic field lines at high northern magnetic latitudes (L>10), during its in-orbit commissioning phase (September 2004). The ambient magnetic field, as well as …
An Outburst Detected in the Spectrum of Hd 6226
Šlechta, Miroslav; Škoda, Petr
HD 6226 is a bright binary Be star at visual magnitude 6.81 (Hipparcos database). The emission and absorption phases occur in cycles, which are probably not periodic. The suspected period of about 630 days (derived from photometric measurements) is not confirmed by our spectroscopic survey. The latest emission phase developed in the beginning of 2…
Discovery and study of Comet 67P/Churyumov--Gerasimenko, the main target of the Rosetta space mission
Churyumov, K.
Rosetta, a European space vehicle, which was 15 years in development, headed for short-period Comet 67P/Churyumov-Gerasimenko in February 2004. In September 1969 S. Gerasimenko and the author went to the Alma-Ata Astrophysical Institute to carry out a survey of short-period and new comets. At a later date of that month, the author examined the exp…
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 …