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The role of mud volcanoes in the evolution of Hecate Tholus Volcano on the surface of Mars

Kangi, Abas

Hecate Tholus Volcano has undergone numerous changes in its history of evolution. Further, the phenomena occurring on the surface of this volcano endow us with a remarkable perspective of recent martian geological changes. In the vicinity of this volcano cone, most of the lava is covered with a thick layer of loose sediments (probably clay). The p…

Reply to comment by P. Riley and J. T. Gosling on ``Are high-latitude forward-reverse shock pairs driven by overexpansion?''

Zurbuchen, T. H.; Manchester, W. B.

Electron density and carriers of the diffuse interstellar bands

Galazutdinov, G. A.; Gnaciński, P.; Sikorski, J. K.

We have used the ionisation equilibrium equation to derive the electron density in interstellar clouds in the direction of 13 stars. A linear relation was found that allows determination of the electron density from the Mg I and Mg II column densities in diffuse clouds. The comparison of a normalised equivalent width of 12 DIBs with the electron d…

Hipparcos Astrometric Orbit and Evolutionary Status of HR 6046

Torres, Guillermo

The previously known, 6 yr single-lined spectroscopic binary HR 6046 has been speculated in the past to contain a compact object as the secondary. A recent study has redetermined the orbit with great accuracy and shown that the companion is an evolved but otherwise normal star of nearly identical mass to the primary, which is also a giant. The bin…

The star pile in Abell 545

Richtler, T.; West, M. J.; Salinas, R. +2 more

Context: Struble (1988, ApJ, 330, L25) found what appeared to be a cD halo without cD galaxy in the center of the galaxy cluster Abell 545. This remarkable feature has been passed almost unnoticed for nearly twenty years.
Aims: Our goal is to review Struble's claim by providing a first (preliminary) photometric and spectroscopic analysis of th…

Formation of a Two-Dense-Rings-Pattern Disk from the Collapse of a Cloud

Nagel, E.

In this paper, the formation of a disk resulting from the collapse of a rigidly-rotating cloud is studied. The plane perpendicular to the angular velocity axis that contains the star is the locus where materials falling from both sides face each other with the consequent formation of a double layer shock structure. The shocked material that moves …

A new image of Titan. Titan as seen from Huygens

Lebreton, J. -P.; Raulin, F.; Gazeau, M. -C.

The evolution of shocks near the surface of Sun during the epoch of Halloween 2003

Wu, S. T.; Dryer, M.; Smith, Z. +4 more

We use a one-dimensional, time-dependent adaptive grid MHD code to study the evolution of shocks (both slow and fast shocks) from the surface of the Sun through the heliosphere. In order to achieve the goal, we track a specific solar event's plasma and magnetic field output as it propagates into interplanetary space with a possible geoeffective co…

Intensity enhancements of 200-2000 MeV protons in 1997-2005 as measured by the KET/ULYSSES

Struminsky, A. B.

FCAPT uvby Photometry of the mCP Stars HD 16545, HD 93226, HR 7575, and HR 8206

Adelman, Saul J.

The Four College Automated Photoelectric Telescope (FCAPT) obtained differential Strömgren uvby observations of the magnetic CP (mCP) stars HD 16545, HD 93226, HR 7575, and HR 8206. These are the first reported from the FCAPT. HD 16545, with its largest amplitudes (0.06 mag) being those in v and in b, has a period of 1.61926 days, close to its per…