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The use of the Pearson differential equation to test energetic distributions in space physics as Kappa distributions; implication for Tsallis nonextensive entropy: II
Shizgal, Bernie D.
This paper presents a mathematical demonstration that particular observed energetic particle distributions of space physics in the particle velocity magnitude,
A Machine Learning Approach to Predicting SEP Events Using Properties of Coronal Mass Ejections
Zhang, Ming; Zhao, Lulu; Torres, Jesse +1 more
Solar energetic particles (SEPs) can cause severe damage to astronauts and their equipment, and can disrupt communications on Earth. A lack of thorough understanding the eruption processes of solar activities and the subsequent acceleration and transport processes of energetic particles makes it difficult to forecast the occurrence of an SEP event…
Establishing the accuracy of asteroseismic mass and radius estimates of giant stars - II. Revised stellar masses and radii for KIC 8430105
Grundahl, F.; Lund, M. N.; Miglio, A. +6 more
Asteroseismic scaling relations can provide high-precision measurements of mass and radius for red giant (RG) stars displaying solar-like oscillations. Their accuracy can be validated and potentially improved using independent and accurate observations of mass, radius, effective temperature and metallicity. We seek to achieve this using long perio…
58 open clusters investigated with UBVRI and Gaia eDR3 data
Dias, W. S.; Monteiro, H.; Lépine, J. R. D. +5 more
We present the results of the investigation of 58 open clusters using UBVRI CCD photometry (Johnsons-Cousins system) and Gaia eDR3 data. The membership probability of the stars in the cluster's field was determined from a maximum-likelihood method using Gaia eDR3 astrometric data. The fundamental parameters of the clusters were determined using a …
Spectroscopic study of five SB1 stars with CP components
Giarrusso, M.; Catanzaro, G.; Ferrara, C. +1 more
In this paper, we present the results of a spectroscopic campaign devoted to ascertaining the actual nature of a sample of five objects reported as chemically peculiar stars in the Catalogue of Ap, HgMn and Am stars (2009, A&A, 498, 961). Spectroscopic observations were obtained with Catania Astrophysical Observatory Spectropolarimeter. For ea…
The VVV open cluster project - II. Near-infrared sequences of 37 open clusters on eight-dimensional parameter space
Minniti, D.; Peña Ramírez, K.; Chené, A. -N. +4 more
Open clusters are key coeval structures that help us understand star formation, stellar evolution and trace the physical properties of our Galaxy. In the past years, the isolation of open clusters from the field has been heavily alleviated by the access to accurate large-scale stellar parallaxes and proper motions along a determined line of sight.…
The Common Envelope Origins of the Fast Jet in the Planetary Nebula M 3-38
Guerrero, M. A.; Toalá, J. A.; Rodríguez-López, C. +3 more
We present the analysis of Multi-Espectrógrafo en GTC de Alta Resolución para Astronomía (MEGARA) high-dispersion integral field spectroscopic observations of the bipolar planetary nebula (PN) M 3-38. These observations unveil the presence of a fast outflow aligned with the symmetry axis of M 3-38 that expands with a velocity of up to ±225 km s
Updated orbital monitoring and dynamical masses for nearby M-dwarf binaries
Henning, Thomas; Brandner, Wolfgang; Calissendorff, Per +26 more
Young M-type binaries are particularly useful for precise isochronal dating by taking advantage of their extended pre-main sequence evolution. Orbital monitoring of these low-mass objects becomes essential in constraining their fundamental properties, as dynamical masses can be extracted from their Keplerian motion. Here, we present the combined e…
Digitization, Measurement, and Analysis of a 1905 Barnard Atlas Photographic Plate
Cerny, William; Kron, Richard G.; Martinez, Michael N. +7 more
In the second paper in this series, we improve on our previous demonstration of the ability of a commercially available graphic arts scanner and cost-effective analysis tools to produce scientifically useful scans of astronomical photographic plates. We describe a method using freely available tools to extract magnitude measurements from the star …
Multi-Spacecraft Observations of Fluctuations Occurring Along the Dusk Flank Magnetopause, and Testing the Connection to an Observed Ionospheric Bead
Wing, Simon; Petrinec, Steven M.; Zhang, Yongliang +1 more
During 2018 November 06, 11:30—18:00 UT, the MMS constellation, the Cluster set of spacecraft, and the Geotail spacecraft were all situated near the dusk flank magnetopause. Large scale fluctuations were observed by the available and operating science instruments at these various spacecraft (i.e., magnetic field, plasma moment, and energy flux mea…