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Interinstrument calibration using magnetic field data from the flux-gate magnetometer (FGM) and electron drift instrument (EDI) onboard Cluster
Glassmeier, K. -H.; Steller, M.; Nakamura, R. +10 more
We compare the magnetic field data obtained from the flux-gate magnetometer (FGM) and the magnetic field data deduced from the gyration time of electrons measured by the electron drift instrument (EDI) onboard Cluster to determine the spin-axis offset of the FGM measurements. Data are used from orbits with their apogees in the magnetotail, when th…
Dust evolution in the dwarf galaxy Holmberg II
Wiebe, D. S.; Lozinskaya, T. A.; Egorov, O. V. +1 more
A detailed photometric study of star-forming regions (SFRs) in the galaxy Holmberg II has been carried out using the archival observational data from the far infrared to the ultraviolet obtained with the GALEX, Spitzer, and Herschel telescopes. Spectroscopic observations with the 6-m BTA telescope (Special Astrophysical Observatory of the Russian …
Relaxation Processes in Solar Wind Turbulence
Carbone, V.; Gurgiolo, C.; Goldstein, M. L. +1 more
Based on global conservation principles, magnetohydrodynamic (MHD) relaxation theory predicts the existence of several equilibria, such as the Taylor state or global dynamic alignment. These states are generally viewed as very long-time and large-scale equilibria, which emerge only after the termination of the turbulent cascade. As suggested by hy…
Infrared spectroscopy of asymptotic giant branch stars in the Galactic bulge
Waters, L. B. F. M.; Blommaert, J. A. D. L.; Schultheis, M. +8 more
We have selected a homogeneous sample of asymptotic giant branch (AGB) stars in the Galactic bulge population from the ISOGAL survey. Our target stars cover a wide range of mass-loss rates (∼10-8-10-4 M⊙ yr-1) and differ primarily by their age on the AGB. This homogeneous sample is thus ideally suited to…
An HST/COS Observation of Broad Lyα Emission and Associated Absorption Lines of the BL Lacertae Object H 2356-309
Shull, J. Michael; Danforth, Charles W.; Stocke, John T. +4 more
Weak spectral features in BL Lacertae objects (BL Lacs) often provide a unique opportunity to probe the inner region of this rare type of active galactic nucleus. We present a Hubble Space Telescope/Cosmic Origins Spectrograph observation of the BL Lac H 2356-309. A weak Lyα emission line was detected. This is the fourth detection of a weak Lyα em…
A Transient Supergiant X-Ray Binary in IC 10: An Extragalactic SFXT?
Cappallo, Rigel; Laycock, Silas; Oram, Kathleen +1 more
We report the discovery of a large amplitude (factor of ~100) X-ray transient (IC 10 X-2, CXOU J002020.99+591758.6) in the nearby dwarf starburst galaxy IC 10 during our Chandra monitoring project. Based on the X-ray timing and spectral properties, and an optical counterpart observed with Gemini, the system is a high-mass X-ray binary consisting o…
A Detailed Analysis of the High Resolution X-Ray Spectra of NGC 3516: Variability of the Ionized Absorbers
Nicastro, F.; Krongold, Y.; Longinotti, A. L. +3 more
The 1.5 Seyfert galaxy NGC 3516 presents a strong time variability in X-rays. We re-analyzed the nine observations performed in 2006 October by XMM-Newton and Chandra in the 0.3 to 10 keV energy band. An acceptable model was found for the XMM-Newton data fitting the EPIC-PN and RGS spectra simultaneously; later, this model was successfully applied…
Stochasticity and Persistence of Solar Coronal Mass Ejections
Carbone, V.; Antonucci, E.; Telloni, D. +1 more
The study of the statistical properties of coronal mass ejections (CMEs) reveals that their properties depend on the period of solar activity. In particular, when investigating the origin of the waiting time distribution between CMEs, a significant departure from a Poisson process during periods of high solar activity has been found, thus suggesti…
HD 51844: An Am δ Scuti in a binary showing periastron brightening
Baudin, F.; Poretti, E.; Michel, E. +12 more
Context. Pulsating stars in binary systems are ideal laboratories to test stellar evolution and pulsation theory, since a direct, model-independent determination of component masses is possible. The high-precision CoRoT photometry allows a detailed view of the frequency content of pulsating stars, enabling detection of patterns in their distributi…
Constraints on the winds of hot subdwarf stars from X-ray observations of two sdB binaries with compact companions: CD -30° 11223 and PG 1232-136
Tiengo, A.; Mereghetti, S.; Geier, S. +5 more
Little observational data are available on the weak stellar winds of hot subdwarf stars of B spectral type (sdB). Close binary systems composed of an sdB star and a compact object (white dwarf, neutron star or black hole) could be detected as accretion-powered X-ray sources. The study of their X-ray emission can probe the properties of line-driven…