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Variability in hot sub-luminous stars and binaries: Machine-learning analysis of Gaia DR3 multi-epoch photometry
Groot, P. J.; Aerts, C.; Ranaivomanana, P. +3 more
Context. Hot sub-luminous stars represent a population of stripped and evolved red giants that is located on the extreme horizontal branch. Since they exhibit a wide range of variability due to pulsations or binary interactions, it is crucial to unveil their intrinsic and extrinsic variability to understand the physical processes of their formatio…
Alpha–Proton Relative Drift: Implications for the Origins and Dynamics of the Solar Wind
Matteini, Lorenzo; Wang, Joseph H.; Horbury, Timothy S. +1 more
Helium nuclei (alpha particles) strongly influence the momentum and energy balance in the solar wind, comprising up to 20% of the solar wind mass density. In fast Alfvénic wind at heliocentric distances greater than 0.3 au, the alpha particles' bulk flow speed is systematically different to that of the protons. This relative drift speed is of unkn…
Spectral analysis of ultraluminous X-ray pulsars with models of X-ray pulsars
Paul, Biswajit; Sharma, Rahul; Kumar, Manish +1 more
A fraction of the ultraluminous X-ray (ULX) sources are known to be accreting neutron stars as they show coherent X-ray pulsations with pulse periods ranging from
Stellar magnetic activity in Earth 2.0 candidates based on LAMOST DR10
Zhang, Liyun; Han, Xianming L.; Misra, Prabhakar +3 more
Aims. Stellar chromospheric activity can impact the search for exoplanets. Earth 2.0 (ET 2.0) is a space telescope designed for exoplanet detection. In this work, we survey the stellar chromospheric activity in the ET 2.0 target regions to enhance the detection rate of exoplanets. Methods. This work uses Hα and Ca II H&K lines as indicators of chr…
Origin of the Unusual Composition of 3He-rich Solar Energetic Particles
Wimmer-Schweingruber, Robert F.; Rodríguez-Pacheco, Javier; Ho, George C. +3 more
We examine 3He-rich solar energetic particles (SEPs) detected on 2023 October 24–25 by Solar Orbiter at 0.47 au. Measurements reveal that heavy-ion enhancements increase irregularly with mass, peaking at S. C, and especially N, Si, and S, stand out in the enhancement pattern with large abundances. Except for 3He, heavy-ion sp…
Filling the Gap: The Missing Eclipses of γ Persei from 2005 and from 2006
Molnár, László; Ádám, Rozália Z.
γ Persei is a long-period (P ≈ 14.6 yr) eclipsing binary system. Its period makes it a difficult target to fully understand: so far, only two primary eclipses are known in the literature, from 1990 and from 2019, whereas the 2005 one was missed due to its closeness to the Sun at the time. We aimed to fill in this gap by processing the quasi-contin…
3D Nonequilibrium Ionization and Spectroscopic Modeling of Coronal Mass Ejections. I. Comparison with Hinode/EIS Observations
Landi, E.; Manchester, W. B.; Wraback, E. M. +1 more
High-resolution EUV spectroscopy provides an informative diagnostic tool for the early evolution of coronal mass ejections (CMEs) since it can directly measure many physical properties of CME plasma close to the Sun that cannot be determined from white-light coronagraphs or narrowband imagers. The Hinode/EUV Imaging Spectrometer (EIS) captured a s…
Exploring the empirical instability strip for γ Dor-type stars in eclipsing binaries
Çakırlı, Ö.; Bilir, S.; Özdarcan, O. +1 more
This research paper has light-curve modelling, spectroscopy, and detailed asteroseismic studies for five detached eclipsing binaries with a
Modified Masses and Parallaxes of the Close Visual Triple System HD 2893
Masda, Suhail; Al-Wardat, Mashhoor; Aljboor, Hussam +4 more
We present the essential stellar parameters of the close visual triple system HD 2893 using Al-Wardat's method for analyzing binary and multiple star systems in conjunction with Kurucz's model atmospheres. This method accurately computes the spectrophotometric stellar masses through a combined synthetic spectral energy distribution approach that c…
A Case Study of Interstellar Material Delivery: α Centauri
Wiegert, Paul A.; Gregg, Cole R.
Interstellar material has been discovered in our solar system, yet its origins and details of its transport are unknown. Here, we present α Centauri as a case study of the delivery of interstellar material to our solar system. α Centauri is a mature triple star system that likely harbors planets, and is moving toward us with the point of the close…