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Complex Organic Materials in the Circumstellar Disk of HR 4796A
Weinberger, Alycia J.; Debes, John H.; Schneider, Glenn
We combine HST NICMOS imaging photometry of the HR 4796A disk at previously unobserved wavelengths between 1.71-2.22 µm with reprocessed archival observations to produce a measure of the dust's scattering efficiency as a function of wavelength. The spectrum of the dust, synthesized from the seven photometric measures, is characterized by a s…
The High-Velocity Gas toward Messier 5: Tracing Feedback Flows in the Inner Galaxy
Brown, Thomas M.; Lehner, Nicolas; Howk, J. Christopher +2 more
We present FUSE and STIS E140M observations of the post-AGB star ZNG 1 in the globular cluster Messier 5 (l = 3.9°, b = + 47.7° d = 7.5 kpc , z = + 5.3 kpc ). High-velocity absorption is seen in C IV, Si IV, O VI, and lower ionization species at LSR velocities of roughly -140 and -110 km s-1. We conclude that this gas is not circumstell…
Determining the LIC H density from the solar wind slowdown
Liu, Y.; McComas, D. J.; Wang, C. +1 more
Context: The ionized solar wind interacts directly with the interstellar neutrals which flow into the heliosphere. These neutrals are ionized, mainly by charge exchange, then accelerated to the solar wind speed with the momentum and energy removed from the bulk flow of the solar wind. Thus, by measuring the solar wind slowdown, one can estimate th…
Observations of chorus at Saturn using the Cassini Radio and Plasma Wave Science instrument
Gurnett, D. A.; Dougherty, M. K.; Hospodarsky, G. B. +4 more
Observations at Saturn of whistler mode chorus emissions have been obtained by the Cassini Radio and Plasma Wave Science instrument. Data from the first 45 orbits are analyzed, and the characteristics of the chorus emissions are discussed. Wave normal and Poynting vector measurements from the five-channel waveform receiver are used to examine the …
Point spread functions for the Solar optical telescope onboard Hinode
Wedemeyer-Böhm, S.
Aims: We investigate the combined point spread function (PSF) of the Broadband Filter Imager (BFI) and the Solar Optical Telescope (SOT) onboard the Hinode spacecraft.
Methods: Observations of the Mercury transit from November 2006 and the solar eclipse(s) from 2007 are used to determine the PSFs of SOT for the blue, green, and red continuum c…
The Population of Propellers in Saturn's A Ring
Porco, Carolyn C.; Hedman, Matthew M.; Burns, Joseph A. +1 more
We present an extensive data set of ~150 localized features from Cassini images of Saturn's A ring, a third of which are demonstrated to be persistent by their appearance in multiple images, and half of which are resolved well enough to reveal a characteristic "propeller" shape. We interpret these features as the signatures of small moonlets embed…
NGC 346 in the Small Magellanic Cloud. III. Recent Star Formation and Stellar Clustering Properties in the Bright H II Region N66
Henning, Thomas; Gouliermis, Dimitrios A.; Dolphin, Andrew E. +2 more
In the third part of our photometric study of the star-forming region NGC 346/N66 and its surrounding field in the Small Magellanic Cloud (SMC), we focus on the large number of low-mass pre-main-sequence (PMS) stars revealed by the Hubble Space Telescope observations with the Advanced Camera for Surveys. We investigate the origin of the observed b…
Geomorphic study of fluvial landforms on the northern Valles Marineris plateau, Mars
Mangold, N.; Quantin, C.; Neukum, G. +2 more
Fluvial landforms are observed on the plateau near Echus Chasma and other locations on the Valles Marineris plateau using high resolution (10 to 50 m/pixel) Mars Express images and topography. Branching valleys have a 20- to 100-m deep V-shape profile typical of fluvial processes. Their incision occurred in a thin (<150 m) and weak, dark unit t…
New results of investigations of whistler-mode chorus emissions
Santolík, O.
This review summarizes selected recent results obtained during investigation of whistler-mode chorus emissions in the Earth's magnetosphere. Special attention is paid to results published during the last five years, with a focus on the results of the CLUSTER project. The nonlinear nature of chorus emissions is demonstrated using both theoretical r…
Cometary dust trail associated with Rosetta mission target: 67P/Churyumov Gerasimenko
Ishiguro, Masateru
A thin, bright dust cloud, which is associated with the Rosetta mission target object (67P/Churyumov-Gerasimenko), was observed after the 2002 perihelion passage. The neckline structure or dust trail nature of this cloud is controversial. In this paper, we definitively identify the dust trail and the neckline structure using a wide-field CCD camer…