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Observations and Modeling of the Opposition Surges of the Icy Moons of Saturn Based on Cassini Visual Infrared Mapping Spectrometer Data
Buratti, B. J.; Hendrix, A. R.; Dalba, P. A. +5 more
Observations of the opposition surges on the main moons of Saturn (Mimas, Enceladus, Tethys, Dione, Rhea, and Iapetus) during Cassini's prime and extended missions are reduced and analyzed. The main data set comes from the Visual Infrared Mapping Spectrometer (VIMS) with wavelength coverage in the visible and near-infrared out to 3.60 µm, co…
Optical polarization signatures of black hole X-ray binaries
Piirola, Vilppu; Poutanen, Juri; Veledina, Alexandra +7 more
Polarimetry provides an avenue for probing the geometry and physical mechanisms producing optical radiation in many astrophysical objects, including stellar binary systems. We present the results of multiwavelength (BVR) polarimetric studies of a sample of historical black hole X-ray binaries, observed during their outbursts or in the quiescent (o…
Multiple variability time-scales of the early nitrogen-rich Wolf-Rayet star WR 7
Koenigsberger, G.; Hamann, W. -R.; Estrada-Dorado, S. +7 more
We present the analysis of the optical variability of the early, nitrogen-rich Wolf-Rayet (WR) star WR 7. The analysis of multisector Transiting Exoplanet Survey Satellite (TESS) light curves and high-resolution spectroscopic observations confirm multiperiodic variability that is modulated on time-scales of years. We detect a dominant period of 2.…
A Photometric Study of Two Contact Binaries: CRTS J025408.1+265957 and CRTS J012111.1+272933
Hu, Qingshun; Zhang, Yu; Ma, Shuo +2 more
We performed new photometric observations for two contact binaries (i.e., CRTS J025408.1+265957 and CRTS J012111.1+272933), which were observed by the 1.0 m telescope at Xingjiang Astronomical Observatory. From our light curves and several survey data, we derived several sets of photometric solutions. We found that CRTS J025408.1+265957 and CRTS J…
Simulating nearly edge-on sloshing in the galaxy cluster Abell 2199
Laganá, T. F.; Machado, R. E. G.; Souza, G. S. +3 more
Off-axis collisions between galaxy clusters may induce the phenomenon of sloshing, causing dense gas to be dragged from the cool core of a cluster, resulting in a spiral of enhanced X-ray emission. Abell 2199 displays signatures of sloshing in its core and it is possible that the orbital plane of the collision is seen nearly edge-on. We aim to eva…
Detailed analysis of a sample of field metal-poor N-rich dwarfs
Bonifacio, P.; Caffau, E.; Spite, M. +2 more
Aims: The aim of this work is to compare the detailed chemical composition of the field N-rich dwarf stars to the second-generation stars of globular clusters (GCs) in order to investigate the hypothesis that they originated in GCs.
Methods: We measured the abundance of 23 elements (from Li to Eu) in a sample of six metal-poor N-rich star…
The Magnetic Field Environment of Active Region 12673 That Produced the Energetic Particle Events of September 2017
Green, Lucie M.; Yardley, Stephanie L.; Mihailescu, Teodora +2 more
Forecasting solar energetic particles (SEPs), and identifying flares/coronal mass ejections (CMEs) from active regions (ARs) that will produce SEP events in advance is extremely challenging. We investigate the magnetic field environment of AR 12673, including the AR's magnetic configuration, the surrounding field configuration in the vicinity of t…
Morpho-kinematic Modeling of the Expanding Ejecta of the Extremely Slow Nova V1280 Scorpii
Maehara, Hiroyuki; Sakon, Itsuki; Watanabe, Makoto +10 more
Knowledge of the morphology of nova ejecta is essential for fully understanding the physical processes involved in nova eruptions. We studied the 3D morphology of the expanding ejecta of the extremely slow nova V1280 Sco with a unique light curve. Synthetic line profile spectra were compared to the observed [O III] λλ4959, 5007 and [N II] λ5755 em…
Stellar population astrophysics (SPA) with the TNG. The chemical content of the red supergiant population in the Perseus complex
Dalessandro, E.; Sanna, N.; Mucciarelli, A. +3 more
Context. The Perseus complex in the outer disk of the Galaxy hosts a number of clusters and associations of young stars. Gaia is providing a detailed characterization of their kinematic structure and evolutionary properties.
Aims: Within the SPA Large Program at the TNG, we secured HARPS-N and GIANO-B high-resolution optical and near-infrared…
Density Turbulence and the Angular Broadening of Outer Heliospheric Radio Sources at High Latitudes and in the Ecliptic Plane
Cairns, Iver H.; Adhikari, L.; Tasnim, Samira +1 more
Density irregularities are responsible for the scattering of radio waves in the solar wind and astrophysical plasmas. These irregularities significantly affect the inferred physical properties of radio sources, such as size, direction, and intensity. We present here a theory of angular broadening due to the scattering of radio waves by density irr…