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The slowly pulsating B-star 18 Pegasi: A testbed for upper main sequence stellar evolution
Mugrauer, M.; Irrgang, A.; Moehler, S. +2 more
The predicted width of the upper main sequence in stellar evolution models depends on the empirical calibration of the convective overshooting parameter. Despite decades of discussions, its precise value is still unknown and further observational constraints are required to gauge it. Based on a photometric and preliminary asteroseismic analysis, w…
Recombining plasma in the remnant of a core-collapsed supernova, Kes 17
Koyama, Katsuji; Uchida, Hiroyuki; Nobukawa, Masayoshi +4 more
We report on Suzaku results concerning Kes 17, a Galactic mixed-morphology supernova remnant. The X-ray spectrum of the whole Kes 17 is well explained by a pure thermal plasma, in which we found Lyα of Al XIII and Heα of Al XII, Ar XVII, and Ca XIX lines for the first time. The abundance pattern and the plasma mass suggest that Kes 17 is a remnant…
A New 3D Multi-fluid Model: A Study of Kinetic Effects and Variations of Physical Conditions in the Cometary Coma
Huang, Z.; Jia, X.; Bieler, A. +8 more
Physics-based numerical coma models are desirable whether to interpret the spacecraft observations of the inner coma or to compare with the ground-based observations of the outer coma. In this work, we develop a multi-neutral-fluid model based on the BATS-R-US code of the University of Michigan, which is capable of computing both the inner and out…
Contribution from SOIR/VEX to the updated Venus International Reference Atmosphere (VIRA)
Vandaele, A. C.; Trompet, L.; Robert, S. +9 more
The SOIR instrument on-board Venus Express is an infrared spectrometer covering the 2.2-4.3 µm spectral region. This instrument allows the detection of several key species of the Venus atmosphere, including CO2, CO, H2O/HDO, HCl, HF and SO2. From the CO2 density measurements, temperature is inferre…
High precision comet trajectory estimates: The Mars flyby of C/2013 A1 (Siding Spring)
Micheli, M.; Farnocchia, D.; Delamere, W. A. +6 more
The Mars flyby of C/2013 A1 (Siding Spring) represented a unique opportunity for imaging a long-period comet and resolving its nucleus and rotation state. Because of the small encounter distance and the high relative velocity, the goal of successfully observing C/2013 A1 from the Mars orbiting spacecraft posed strict accuracy requirements on the c…
Spectroscopic Orbits for 15 Late-type Stars
Abt, Helmut A.; Fekel, Francis C.; Willmarth, Daryl W. +1 more
Spectroscopic orbital elements are determined for 15 stars with periods from 8 to 6528 days with six orbits computed for the first time. Improved astrometric orbits are computed for two stars and one new orbit is derived. Visual orbits were previously determined for four stars, four stars are members of multiple systems, and five stars have Hippar…
Ultra-Low-Frequency Waves at Venus and Mars
Dubinin, E.; Fraenz, M.
Mars and Venus have no global magnetic field. The solar wind interacts directly with their ionospheres and atmospheres, inducing magnetospheres by a pileup of the interplanetary magnetic field. The first measurements of the ultra-low-frequency activity on Mars were made by the Phobos-2 spacecraft. This chapter investigates the wave observations re…
The Molecular Baryon Cycle of M82
Chisholm, John; Matsushita, Satoki
Baryons cycle into galaxies from the intergalactic medium and are converted into stars; a fraction of the baryons are ejected out of galaxies by stellar feedback. Here we present new high-resolution (3.″9 68 pc) 12CO(2-1) and 12CO(3-2) images that probe these three stages of the baryon cycle in the nearby starburst M82. We co…
Lithospheric flexure and gravity spreading of Olympus Mons volcano, Mars
Williams, D. A.; Platz, T.; Dumke, A. +5 more
The structural architecture of large volcanoes is governed substantially by gravity-driven deformation that is manifest as distinct processes such as basement flexure or volcanic spreading. Temporal effects and the mutual interplay of these processes have been investigated only to a limited extent, and so we present novel numerical models of the t…
Disk-resolved photometry of Vesta and Lutetia and comparison with other asteroids
Longobardo, Andrea; Palomba, Ernesto; De Sanctis, Maria Cristina +7 more
Photometry of asteroids gives fundamental information about their spectral and physical properties. The aim of this work is two-fold: (1) to calculate phase functions of Vesta and Lutetia in the visible spectral range; and (2) to compare photometric properties of all the asteroids visited by space missions, as inferred from disk-resolved photometr…