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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…
LCROSS (Lunar Crater Observation and Sensing Satellite) Observation Campaign: Strategies, Implementation, and Lessons Learned
Terada, Hiroshi; de Pater, Imke; Vilas, Faith +84 more
NASA's LCROSS (Lunar Crater Observation and Sensing Satellite) mission was designed to explore the nature of previously detected enhanced levels of hydrogen near the lunar poles. The LCROSS mission impacted the spent upper stage of the launch vehicle into a permanently shadowed region of the lunar surface to create an ejecta plume. The resultant i…
High resolution IR observations of the starburst ring in NGC 7552. One ring to rule them all?
Schaerer, D.; Brandl, B. R.; van der Werf, P. P. +2 more
Aims: Approximately 20% of all spiral galaxies display starburst activity in nuclear rings of a few hundred parsecs in diameter. It is our main aim to investigate how the starburst ignites and propagates within the ring, leading to the formation of massive stellar clusters.
Methods: We observed the ring galaxy NGC 7552 with the mid-infra…
Spitzer Observations of the HH 1/2 System: The Discovery of the Counterjet
Raga, A. C.; Noriega-Crespo, A.
We present unpublished Spitzer IRAC observations of the HH 1/2 young stellar outflow processed with a high angular resolution deconvolution algorithm that produces subarcsecond (~0farcs6-0farcs8) images. In the resulting mid-infrared images, the optically invisible counterjet is detected for the first time. The counterjet is approximately half as …
Turbulence in a global magnetohydrodynamic simulation of the Earth's magnetosphere during northward and southward interplanetary magnetic field
Richard, R. L.; El-Alaoui, M.; Walker, R. J. +2 more
We report the results of MHD simulations of Earth's magnetosphere for idealized steady solar wind plasma and interplanetary magnetic field (IMF) conditions. The simulations feature purely northward and southward magnetic fields and were designed to study turbulence in the magnetotail plasma sheet. We found that the power spectral densities (PSDs) …
A deep, wide-field study of Holmberg II with Suprime-Cam: evidence for ram pressure stripping
Jablonka, Pascale; Arimoto, Nobuo; Ferguson, Annette M. N. +3 more
We present a deep, wide-field optical study of the M81 group dwarf galaxy Holmberg II (HoII) based on Subaru/Suprime-Cam imaging. Individual stars are resolved down to I ∼ 25.2, that is, about 1.5 mag below the tip of the red giant branch (RGB). We use resolved star counts in the outskirts of the galaxy to measure the radial surface brightness pro…