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New luminous blue variable candidates in NGC 4736
Vinokurov, A.; Solovyeva, Y.; Atapin, K. +8 more
We have found three new luminous blue variable (LBV) candidates in the star-forming galaxy NGC 4736. They show typical well-known LBV spectra, broad and strong hydrogen lines, He I lines, many Fe II lines, and forbidden [Fe II] and [Fe III]. Using archival Hubble Space Telescope and ground-based telescope data, we have estimated the bolometric mag…
Star formation in far-IR AGN and non-AGN galaxies in the green valley - II. Morphological analysis
Pović, Mirjana; Väisänen, Petri; Mahoro, Antoine +2 more
This paper studies morphological properties of 103 green valley FIR active and 2609 non-active galaxies presented in Mahoro, Pović & Nkundabakura (2017). The photometric data from the COSMOS survey were used, and the morphological parameters, such as Abraham and Conselice-Bershady concentration indices, Gini, M20 moment of light, and asymmetry…
Chemical analysis of K giants in the young open cluster NGC 2345
Pereira, C. B.; Holanda, N.; Drake, N. A.
We present results for the elemental abundances of five K giants of the young open cluster NGC 2345. The atmospheric parameters of the studied giants and their chemical abundances were determined using high-resolution optical spectroscopy. In this study, we determine abundances of light elements (Li, C, N), light odd-Z elements (Na, Al), α-element…
Detailed study of the Milky Way globular cluster Laevens 3
Martin, Nicolas; Ibata, Rodrigo A.; Mackey, Dougal +4 more
We present a photometric and spectroscopic study of the Milky Way satellite Laevens 3. Using MegaCam/Canada-France-Hawaii Telescope g and i photometry and Keck II/DEIMOS multi-object spectroscopy, we refine the structural and stellar properties of the system. The Laevens 3 colour-magnitude diagram shows that it is quite metal-poor, old (13.0 ± 1.0…
Surface evolution of the Anhur region on comet 67P/Churyumov-Gerasimenko from high-resolution OSIRIS images
Jorda, L.; Lamy, P. L.; Bertaux, J. -L. +34 more
Context. The southern hemisphere of comet 67P/Churyumov-Gerasimenko (67P) became observable by the Rosetta mission in March 2015, a few months before cometary southern vernal equinox. The Anhur region in the southern part of the comet's larger lobe was found to be highly eroded, enriched in volatiles, and highly active.
Aims: We analyze high-…
Seasonal variations in source regions of the dust jets on comet 67P/Churyumov-Gerasimenko
Jorda, L.; Lara, L. M.; Bertaux, J. -L. +43 more
Aims: We investigate the surface distribution of the source regions of dust jets on comet 67P/Churyumov-Gerasimenko as a function of time.
Methods: The dust jet source regions were traced by the comprehensive imaging data set provided by the OSIRIS scientific camera.
Results: We show in detail how the projected footpoints of the dus…
Spectral Signatures of Adiabatic Electron Acceleration at Saturn Through Corotation Drift Cancelation
Krupp, N.; Roussos, E.; Zong, Q. G. +3 more
The energetic electron spectra of Saturn's radiation belts are studied using Cassini's 13 years of measurements by the Magnetosphere Imaging Instrument/Low Energy Magnetospheric Measurement System detector. We find that between L shells (L) of 10 and 4.5 the differential flux spectrum of 0.3- to 1.6-MeV electrons evolves from a single power law to…
Onset and Evolution of the Oblique, Resonant Electron Firehose Instability in the Expanding Solar Wind Plasma
Velli, Marco; Innocenti, Maria Elena; Tenerani, Anna +1 more
A double adiabatically expanding solar wind would quickly develop large parallel to perpendicular temperature anisotropies in electrons and ions that are not observed. One reason is that firehose instabilities would be triggered, leading to an ongoing driving/saturation evolution mechanism. We verify this assumption here for the first time for the…
Kinetic Monte Carlo Model for the Precipitation of High-Energy Protons and Hydrogen Atoms into the Atmosphere of Mars with Taking into Account the Measured Magnetic Field
Gérard, J. -C.; Hubert, B.; Shematovich, V. I. +1 more
Results of model computations of the interaction of the high-energy protons and hydrogen atoms (H/H+) precipitating into the Martian atmosphere are presented. These computations were performed using a modification of the kinetic Monte Carlo model developed earlier for the analysis of the data from the MEX/ASPERA-3 instrument onboard the…
An equatorial thermal wind equation: Applications to Jupiter
Wong, Michael H.; Tollefson, Joshua; Marcus, Philip S. +1 more
To relate the vertical wind shear to horizontal temperature gradients at and near the equator, we derive an "Equatorial Thermal Wind Equation" (EQTWE) using a minimum set of assumptions that are easily satisfied for the atmospheres of all the giant planets and Earth. Similar to the textbook Thermal Wind Equation (TWE), the EQTWE requires a small R…