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Solar cycle dependence of the cusp O+ access to the near-Earth magnetotail
Dandouras, I.; Klecker, B.; Kistler, L. M. +2 more
Ionospheric origin O+ accelerated in the cusp/cleft region is one source for the O+ observed in the plasma sheet. This O+ is convected over the polar cap, flowing along open field lines to the tail lobes, and finally entering the plasma sheet. In this paper we use Cluster/CODIF data to study how the occurrence of c…
High-resolution X-Ray Spectroscopy of the Magnetic Of?p Star HD 148937
Walborn, Nolan R.; Zhekov, Svetozar A.; Nazé, Yaël
High-resolution data of the peculiar magnetic massive star HD 148937 were obtained with Chandra-HETGS, and are presented here in combination with a re-analysis of the older XMM-RGS data. The lines of the high-Z elements (Mg, Si, S) were found to be unshifted and relatively narrow (FWHM of about 800 km s-1), i.e., narrower than the O lin…
Solid-phase C60 in the peculiar binary XX Oph?
van Loon, J. Th.; Gehrz, R. D.; Eyres, S. P. S. +8 more
We present infrared spectra of the binary XX Oph obtained with the Infrared Spectrograph on the Spitzer Space Telescope. The data show some evidence for the presence of solid C60- the first detection of C60 in the solid phase - together with the well-known 'unidentified infrared' emission features. We suggest that, in the cas…
Radially extended kinematics in the S0 galaxy NGC 2768 from planetary nebulae, globular clusters and starlight
Cortesi, Arianna; Forbes, Duncan A.; Romanowsky, Aaron J. +7 more
There are only a few tracers available to probe the kinematics of individual early-type galaxies beyond one effective radius. Here we directly compare a sample of planetary nebulae (PNe), globular clusters (GCs) and galaxy starlight velocities out to approximately four effective radii, in the S0 galaxy NGC 2768. Using a bulge-to-disc decomposition…
Bouncing on Titan: Motion of the Huygens probe in the seconds after landing
Karkoschka, Erich; Schröder, Stefan E.; Lorenz, Ralph D.
While landing on Titan, several instruments onboard Huygens acquired measurements that indicate the probe did not immediately come to rest. Detailed knowledge of the probe's motion can provide insight into the nature of Titan's surface. Combining accelerometer data from the Huygens Atmospheric Structure Instrument (HASI) and the Surface Science Pa…
IRAS 11472-0800: an extremely depleted pulsating binary post-AGB star
Hrivnak, B. J.; Gorlova, N.; Van Winckel, H. +2 more
Aims: We focus here on one particular and poorly studied object, IRAS 11472-0800. It is a highly evolved post-asymptotic giant branch (post-AGB) star of spectral type F, with a large infrared excess produced by thermal emission of circumstellar dust.
Methods: We deployed a multi-wavelength study that includes the analyses of optical and …
Optical identification of X-ray source 1RXS J180431.1-273932 as a magnetic cataclysmic variable
Masetti, N.; Parisi, P.; Nucita, A. A.
The X-ray source 1RXS J180431.1-273932 has been proposed as a new member of the symbiotic X-ray binary (SyXB) class of systems, which are composed of a late-type giant that loses matter to an extremely compact object, most likely a neutron star. In this paper, we present an optical campaign of imaging plus spectroscopy on selected candidate counte…
Energetic electron fluxes at Saturn from Cassini observations
Summers, Danny; Tang, Rongxin
Energetic electron fluxes (18 keV-21 MeV) observed by the MIMI/LEMMS instrument on the Cassini mission during 2004 to 2008 are analyzed. We consider all 101 orbits and we select portions of the orbits that lie within 0.5 RS of the magnetic equatorial plane, where RS is Saturn's radius. We determine the average electron differ…
White-light Observations of Solar Wind Transients and Comparison with Auxiliary Data Sets
DeForest, C. E.; Howard, T. A.; Reinard, A. A.
This paper presents results utilizing a new data processing pipeline for STEREO/SECCHI. The pipeline is used to identify and track 24 large- and small-scale solar wind transients from the Sun out to 1 AU. This comparison was performed during a few weeks around the minimum at the end of Solar Cycle 23 and the start of Cycle 24 (2008 December to 200…
Li I spectra in the 4.65-8.33 micron range: high-Lstates and oscillator strengths
Civiš, S.; Kubelík, P.; Ferus, M. +2 more
Context. Infrared (IR) astronomy capacities have rapidly developed in recent years thanks to several ground- and space-based facilities. To take advantage of these capabilities efficiently, a large amount of atomic data (such as line wavenumber, excited-level energy values, and oscillator strengths) are needed. These data are incomplete, in partic…