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Where are the hot ion lines in classical T Tauri stars formed?
Schmitt, J. H. M. M.; Günther, H. M.
Context: Classical T Tauri stars (hereafter CTTS) show a plethora of in- and outflow signatures in a variety of wavelength bands.
Aims: In order to constrain gas velocities and temperatures, we analyse the emission in the hot ion lines.
Methods: We use all available archival FUSE spectra of CTTS to measure the widths, fluxes and shifts of …
Columbia Hills, Mars: Aeolian features seen from the ground and orbit
Greeley, Ronald; Whelley, Patrick L.; Neakrase, Lynn D. V. +15 more
Abundant wind-related features occur along Spirit's traverse into the Columbia Hills over the basaltic plains of Gusev Crater. Most of the windblown sands are probably derived from weathering of rocks within the crater, and possibly from deposits associated with Ma'adim Vallis. Windblown particles act as agents of abrasion, forming ventifacts, and…
Identification of spectral units on Phoebe
Sotin, C.; Brown, R. H.; Baines, K. H. +31 more
We apply a multivariate statistical method to the Phoebe spectra collected by the VIMS experiment onboard the Cassini spacecraft during the flyby of June 2004. The G-mode clustering method, which permits identification of the most important features in a spectrum, is used on a small subset of data, characterized by medium and high spatial resoluti…
A Puzzling Millisecond Pulsar Companion in NGC 6266
Possenti, A.; Beccari, G.; D'Amico, N. +5 more
We report on the optical identification of the companion to the eclipsing millisecond pulsar PSR J1701-3006B in the globular cluster NGC 6266. A relatively bright star with an anomalous red color and an optical variability (~0.2 mag) that nicely correlates with the orbital period of the pulsar (~0.144 days) has been found nearly coincident with th…
Tropospheric carbon monoxide concentrations and variability on Venus from Venus Express/VIRTIS-M observations
Drossart, Pierre; Irwin, Patrick G. J.; Piccioni, Giuseppe +7 more
We present nightside observations of tropospheric carbon monoxide in the southern hemisphere near the 35 km height level, the first from Venus Express/Visible and Infrared Thermal Imaging Spectrometer (VIRTIS)-M-IR. VIRTIS-M data from 2.18 to 2.50 µm, with a spectral resolution of 10 nm, were used in the analysis. Spectra were binned, with w…
Cluster observations of ``crater'' flux transfer events at the dayside high-latitude magnetopause
Balogh, A.; RèMe, H.; Fazakerley, A. N. +7 more
On 11 January 2002 Cluster detected two "crater"-like flux transfer event (FTE) signatures. The four spacecraft were in quasi-linear formation, spread over ∼2 RE in the magnetopause normal direction, and sample a range of distances from it. The observations occur near a southward turning of the IMF, but no solar wind pressure pulses are…
Extended Red Emission and the evolution of carbonaceous nanograins in NGC 7023
Cuillandre, J. -C.; Joblin, C.; Thomas, J. +3 more
Context: Extended Red Emission (ERE) was recently attributed to the photo-luminescence of either doubly ionized Polycyclic Aromatic Hydrocarbons (PAH++), or charged PAH dimers ([PAH{2}] ^+).
Aims: We analysed the visible and mid-infrared (mid-IR) dust emission in the North-West and South photo-dissociation regions of the reflection …
Forming Early-Type Galaxies in Groups Prior to Cluster Assembly
Tran, Kim-Vy H.; Moustakas, John; Gonzalez, Anthony H. +3 more
We study a unique protocluster of galaxies, the supergroup SG1120-1202. We quantify the degree to which morphological transformation of cluster galaxies occurs prior to cluster assembly in order to explain the observed early-type fractions in galaxy clusters at z = 0. SG1120-1202 at z ~ 0.37 is composed of four gravitationally bound groups that ar…
Gusev photometric variability as seen from orbit by HRSC/Mars-express
Scholten, F.; Neukum, G.; Pinet, P. +12 more
Minnaert and two-term phase function Hapke models are used to describe the photometric properties of the martian surface using HRSC (High Resolution Stereo Camera) multi-angular observations acquired along the ongoing Mars-Express mission. These observations can be pieced together to derive integrated phase functions over a wide range of phase ang…
Plasma convection in Saturn's outer magnetosphere determined from ions detected by the Cassini INCA experiment
Krimigis, S. M.; Mitchell, D. G.; Carbary, J. F. +2 more
The Ion and Neutral Camera (INCA), one of three sensors comprising the Magnetospheric Imaging Instrument (MIMI) on the Cassini spacecraft, measures intensities of hydrogen and oxygen ions and neutral atoms in the Saturnian magnetosphere. The measured intensity spectrum and anisotropy of hot hydrogen and oxygen ions may be used to deduce the spectr…