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Solar wind ion charge state distributions and compound cross sections for solar wind charge exchange X-ray emission
Koutroumpa, Dimitra
Solar Wind Charge eXchange X-ray (SWCX) emission in the heliosphere and Earth's exosphere is a hard to avoid signal in soft X-ray observations of astrophysical targets. On the other hand, the X-ray imaging possibilities offered by the SWCX process has led to an increasing number of future dedicated space missions for investigating the solar wind-t…
Energetic Electrons Accelerated and Trapped in a Magnetic Bottle above a Solar Flare Arcade
Krucker, Säm; Chen, Bin; Yu, Sijie +6 more
Where and how flares efficiently accelerate charged particles remains an unresolved question. Recent studies revealed that a "magnetic bottle" structure, which forms near the bottom of a large-scale reconnection current sheet above the flare arcade, is an excellent candidate for confining and accelerating charged particles. However, further unders…
Solar Wind With Field Lines and Energetic Particles (SOFIE) Model: Application to Historical Solar Energetic Particle Events
van der Holst, Bart; Manchester, Ward; Lario, David +8 more
In this paper, we demonstrate the applicability of the data-driven solar energetic particle (SEP) model, SOlar-wind with FIeld-lines and Energetic-particles (SOFIE), to simulate the acceleration and transport processes of SEPs and make forecast of the energetic proton flux at energies ≥10 MeV that will be observed near 1 AU. The SOFIE model is bui…
Chemodynamical study of two CEMP-no stars from the Hamburg/ESO Survey
Shejeelammal, J.; Goswami, Aruna
The Carbon-Enhanced Metal-Poor (CEMP) stars with no enhancement of neutron-capture elements, the so-called CEMP-no stars are believed to be the direct descendants of first-generation stars and provide a unique opportunity to probe the early Galactic nucleosynthesis. We present a detailed chemical and kinematic analysis for two extremely metal-poor…
Impacts of the Local arm on the local circular velocity inferred from the Gaia DR3 young stars in the Milky Way
Seabroke, George; Kawata, Daisuke; Hunt, Jason A. S. +3 more
A simple one-dimensional axisymmetric disc model is applied to the kinematics of O type and B type stars (OB stars) near the Sun obtained from Gaia Data Release 3 catalogue. The model determines the 'local centrifugal speed' Vc(R0) - defined as the circular velocity in the Galactocentric rest frame, where the star would move …
Evolution of X-ray galaxy cluster properties in a representative sample (EXCPReS). Optimal binning for temperature profile extraction
Arnaud, M.; Pointecouteau, E.; Pratt, G. W. +2 more
We present XMM-Newton observations of a representative X-ray selected sample of 31 galaxy clusters at moderate redshift (0.4 < z < 0.6), spanning the mass range 1014 < M500 < 1015 M⊙. This sample, EXCPReS (Evolution of X-ray galaxy Cluster Properties in a Representative Sample), is used to te…
The Hertzsprung progression of classical Cepheids in the Gaia era
Marconi, Marcella; Molinaro, Roberto; Ripepi, Vincenzo +6 more
A new fine grid of non-linear convective pulsation models for the so-called 'bump Cepheids' is presented to investigate the Hertzprung progression (HP) phenomenon shown by their light and radial pulsation velocity curves. The period corresponding to the centre of the HP is investigated as a function of various model assumptions, such as the effici…
A comprehensive search for hot subdwarf stars using Gaia and TESS. I. Pulsating hot subdwarf B stars
Uzundag, Murat; Pelisoli, Ingrid; Németh, Péter +5 more
Hot subdwarf B (sdB) stars are evolved, subluminous, helium-burning stars that most likely form when red giant stars loose their hydrogen envelope via interactions with close companions. They play an important role in our understanding of binary evolution, stellar atmospheres, and interiors. Only a small fraction of the sdB population is known to …
Cepheid Metallicity in the Leavitt Law (C-MetaLL) survey. V. New multiband (grizJHKs) Cepheid light curves and period-luminosity relations
Ripepi, V.; Molinaro, R.; Marconi, M. +8 more
Context. The highly debated effect of metallicity on the absolute magnitudes of classical Cepheid variables needs to be properly quantified for determining accurate and precise distances based on their Leavitt Law.
Aims: Our goal is to obtain homogeneous optical and near-infrared light curves of Milky Way Cepheid variables complementing their…
A Detailed Survey of the Parallel Mean Free Path of Solar Energetic Particle Protons and Electrons
Ruffolo, D.; Dresing, N.; Bandyopadhyay, R. +4 more
In this work, more than a dozen solar energetic particle (SEP) events are identified where the source region is magnetically well connected to at least one spacecraft at 1 au. The observed intensity–time profiles, for all available proton and electron energy channels, are compared to results computed using a numerical one-dimensional SEP transport…