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Magnetic Field Structure, Doppler Shift, and Intensity of Active Regions and Their Connections with the Solar Wind
Fu, Hui; Li, Bo; Xia, Lidong +4 more
The properties of active regions and their connections with the solar wind are important issues. In this study, nine isolated active regions near the solar disk center were chosen. The relationships between blueshift, intensity, magnetic concentrated areas (MCAs), and the potential-field source-surface (PFSS) open magnetic field of active regions …
Do All Low-Mass Stars Undergo Extra Mixing Processes?
Bania, T. M.; Balser, Dana S.; Wenger, Trey V.
Standard stellar evolution models that only consider convection as a physical process to mix material inside of stars predict the production of significant amounts of 3He in low-mass stars (M < 2 M ⊙), with peak abundances of 3He/H ~ few × 10-3 by number. Over the lifetime of the Galaxy, this ought to…
NGC 5236's stars as tracers of arms and arm widths in spiral galaxies
Silva-Villa, E.; Cano Gómez, X.
Generally, identifying the spiral arms of a spiral galaxy is not a hard task. However, defining the main characteristics, width, and length of those structure is not a common task. Previous studies have used different tracers: star clusters, massers, H α. It was until recently that individual stars were used as tracers of spiral structures. The ba…
GS 121-05-037: A new Galactic chimney candidate with signs of triggered star formation
Molina Lera, J. A.; Cichowolski, S.; Suad, L. A.
Aims: The goal of this study is to analyze the H I supershell GS 121-05-037 and its role in triggering star formation.
Methods: To characterize the supershell, we analyzed the H I 21-cm line and the far-infrared emission distributions. In addition, to study the star formation processes related to GS 121-05-037, we used the Gaia survey, t…
Using Computational Models to Uncover the Parameters of Three Kepler Binaries: KIC 5957123, KIC 8314879, and KIC 10727668
Odesse, Padraic E.; Lovekin, Catherine
Theories of stellar convective core overshoot can be examined through analysis of pulsating stars. Better accuracy can be achieved by obtaining external constraints such as those provided by observing pulsating stars in eclipsing binary systems, but this requires that the binary parameters be identified so photometric variations of the pulsating c…
Convective Line Shifts in the Spectra of Solar-Type Stars
Sheminova, V. A.
The Doppler line shifts in the spectra of the Sun and stars with effective temperatures from 4800 to 6200 K were measured and the average convective (granulation) velocities were estimated. The absolute scale of the line shifts for the stars was established on the basis of the derived dependence of the shifts of solar lines on optical depth. For F…
On the Hydrosphere Stability of TESS Targets: Applications to 700 d, 256 b, and 203 b
Kennefick, Julia; Bonney, Paul
A main determinant of the habitability of exoplanets is the presence of stable liquid surface water. In an era of abundant possible targets, the potential to find a habitable world remains a driving force in prioritization. We present here a data-forward method to investigate the likelihood of a stable hydrosphere on the timescales of the formatio…
Calibration of ISA accelerometer sensing axes for the BepiColombo mission
Lucente, Marco; Lefevre, Carlo; Fiorenza, Emiliano +3 more
ISA is a three-axis accelerometer embarked on-board BepiColombo, a joint ESA/JAXA space mission launched on the 19th of October 2018 at 22.45 (local time) and devoted to put two spacecraft (MPO and MMO) around Mercury (2025), for a deeper investigation of the planet and its environment. ISA aims at measuring, directly and not by modelli…
Does the Fe L-shell blend bias abundance measurements in intermediate-temperature clusters?
Grillo, Claudio; Gastaldello, Fabio; Bartalucci, Iacopo +5 more
In intermediate-mass galaxy clusters (M = 2 − 4 × 1014 M⊙, or equivalently T = 2.5 − 4.5 keV), abundance measurements are almost equally driven by iron K and L transitions at ∼6.7 keV and 0.9 − 1.3 keV, respectively. While K-shell-derived measurements are considered reliable, the resolution of the currently available instrume…
Coaxing the Eclipsing Binary V367 Cygni out of Its Shell
Davidge, T. J.
Spectra that cover 0.63-0.69 µm with a spectral resolution ~17,000 are presented of the W Serpentis system V367 Cygni. Absorption lines of Fe II and Si II that form in a circumsystem shell are prominent features, and the depths of these are stable with time, suggesting that the shell is smoothly distributed and well mixed. Further evidence o…