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Suzaku Detection of an Intense X-Ray Flare from an A-Type Star, HD161084
Sugawara, Yasuharu; Maeda, Yoshitomo; Tsujimoto, Masahiro +4 more
We report on a serendipitous detection of an intense X-ray flare from the Tycho reference source on HD161084 during a Suzaku observation of the galactic center region for ∼20ks. The X-ray Imaging Spectrometer recorded a flare from this A1-type dwarf or subgiant star with a flux of ∼1.4 × 10-12 erg s-1 cm-2 (0.5--10…
Sources of SEP Acceleration during a Flare - CME Event
Vainio, R.; Valtonen, E.; Huttunen-Heikinmaa, K. +3 more
A high-speed, halo-type coronal mass ejection (CME), associated with a GOES M4.6 soft X-ray flare in NOAA AR 0180 at S12W29 and an EIT wave and dimming, occurred on 9 November 2002. A complex radio event was observed during the same period. It included narrow-band fluctuations and frequency-drifting features in the metric wavelength range, type II…
The emission-line spectrum of the UV deficient quasar Ton 34: evidence of shock excitation?
Binette, L.; Krongold, Y.
Context: Emission lines in quasars are believed to originate from a photoionized plasma. There are, however, some emission features that appear to be collisionally excited, such as the Fe II multiplet bands. Shortward of Lyα, there are also a few permitted lines of species from low to intermediate ionization.
Aims: Ton 34 (z_q=1.928) exhibits …
Light curve analyses of new eclipsing binary systems with eccentric orbits
Bulut, İ.; Demircan, O.
A photometric study of seven new eclipsing binary systems with eccentric orbits, namely, V466 Car, V493 Car, V529 Car, MN TrA, V398 Lac, V402 Lac and V821 Cas, is presented. The photometric data analyzed were taken from the Hipparcos database. The secondary minima in all systems were shifted by different amounts from the phase 0.5 giving clear evi…
Upstream proton cyclotron waves at Venus
Russell, C. T.; Wei, H. Y.; Zhang, T. L. +2 more
Data from the magnetometer MAG aboard the Venus Express S/C are investigated for the occurrence of cyclotron wave phenomena upstream of the Venus bow shock. For an unmagnetized planet such as Venus and Mars the neutral exosphere extends into the on-flowing solar wind and pick-up processes can play an important role in the removal of particles from…
A study of the Martian water vapor over Hellas using OMEGA and PFS aboard Mars Express
Bibring, J. -P.; Gondet, B.; Langevin, Y. +8 more
We used the OMEGA imaging spectrometer aboard Mars Express to study the evolution of the water vapor abundance over the Hellas basin, as a function of the seasonal cycle. The H2O column density is found to range from very low values (between southern fall and winter) up to more than 15 pr-µm during southern spring and summer. The general beh…
Venus Express/VIRTIS observations of middle and lower cloud variability and implications for dynamics
Baines, K. H.; Momary, T. W.; McGouldrick, K. +1 more
We present an analysis of Venus Express Visible and Infrared Thermal Imaging Spectrometer (VIRTIS) data, carried out to characterize the morphological, geographical, and evolutionary trends of the middle and lower cloud features that are observed in the atmosphere of Venus as variations in brightness temperatures in specific near-infrared waveleng…
First results on the Be stars observed with the CoRoT satellite
Neiner, C.; Janot-Pacheco, E.; Floquet, M. +13 more
In this paper we present an overview of the analysis of some of the Be stars observed with the CoRoT satellite up to this date. Be stars are very fast-rotating B-type stars which may pulsate as β Cephei or SPB stars. CoRoT has already observed 5 bright Be stars in the seismology fields and several tens of fainter ones in the exoplanet fields with …
Morphological and electrical investigations of lead zirconium titanate thin films obtained by sol-gel synthesis on indium tin oxide electrodes
Marino, S.; Bruno, E.; De Santo, M. P. +4 more
In recent years, interest in PbZr0.53Ti0.47O3 (PZT) films has been rapidly increasing due to their technological applications as ferroelectric materials. In the present work, PZT films are obtained by sol-gel synthesis and deposited by spin coating on a transparent conductor substrate, with a perspective application as rectifying layers in asymmet…
Iterative inversion of global magnetospheric ion distributions using energetic neutral atom (ENA) images recorded by the NUADU/TC2 instrument
Barabash, S.; Dandouras, I.; Cao, J. B. +9 more
A method has been developed for extracting magnetospheric ion distributions from Energetic Neutral Atom (ENA) measurements made by the NUADU instrument on the TC-2 spacecraft. Based on a constrained linear inversion, this iterative technique is suitable for use in the case of an ENA image measurement, featuring a sharply peaked spatial distributio…