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Kinematic study of the Orion Complex: analysing the young stellar clusters from big and small structures
Sánchez-Sanjuán, Sergio; Hernández, Jesús; Pérez-Villegas, Ángeles +4 more
In this work, we analysed young stellar clusters with spatial and kinematic coherence in the Orion star-forming complex. For this study, we selected a sample of pre-main-sequence candidates using parallaxes, proper motions, and positions on the colour-magnitude diagram. After applying a hierarchical clustering algorithm in the 5D parameter space p…
Multi-spacecraft study with the Icarus model: Modelling the propagation of CMEs to Mercury and Earth
Schmieder, B.; Poedts, S.; Démoulin, P. +2 more
Context. Coronal mass ejections (CMEs) are the main drivers of the disturbances in interplanetary space. Earth-directed CMEs can be dangerous, and understanding the CME interior magnetic structure is crucial for advancing space weather studies. It is important to assess the capabilities of a numerical heliospheric model, as a firm understanding of…
Strong Effects of Chorus Waves on Radiation Belts Expected for Future Magnetic Superstorms
Hanzelka, Miroslav; Santolík, Ondřej; Wang, Dedong +4 more
Processes in the radiation belts under extreme geomagnetic conditions involve the interplay between acceleration and loss processes, both of which can be caused by wave-particle interactions. Whistler mode waves play a critical role in these interactions, and up to now their properties during extreme events remained poorly sampled and understood. …
CCD UBV(RI)KC photometry and dynamics of the open cluster NGC 1513
Akkaya Oralhan, İnci; Çakmak, Hikmet; Michel, Raúl +2 more
We derive astrophysical parameters of the open cluster NGC 1513 by means of colour indices built with new CCD UBV(RI)KC photometry. Based on early-type members, the mean foreground reddening and total to selective extinction ratio are E(B - V) = 0.79 ± 0.09 mag and RV = 2.85 ± 0.05. Through the differential grid method, we de…
Multi-epoch X-ray spectral analysis of Centaurus A: Revealing new constraints on iron emission line origins
Tanimoto, Atsushi; Bamba, Aya; Hagino, Kouichi +3 more
We conduct X-ray reverberation mapping and spectral analysis of the radio galaxy Centaurus A to uncover its central structure. We compare the light curve of the hard X-ray continuum from Swift Burst Alert Telescope observations with that of the Fe K
Lithium, rotation and metallicity in the open cluster M35
Bouy, H.; Barrado, D.; Agüeros, M. A. +2 more
Context. Lithium (Li) abundance is an age indicator for G, K, and M stellar types, as its abundance decreases over time for these spectral types. However, despite all of the observational efforts made over the past few decades, the role of rotation, stellar activity, and metallicity in the depletion of Li is still unclear.
Aims: Our purpose i…
JWST/NIRSpec Observations of Brown Dwarfs in the Orion Nebula Cluster
Luhman, K. L.; Tremblin, P.; Parker, R. J. +4 more
We have used the multiobject mode of the Near-Infrared Spectrograph (NIRSpec) on board the James Webb Space Telescope (JWST) to obtain low-resolution 1–5 µm spectra of 22 brown dwarf candidates in the Orion Nebula Cluster, which were selected with archival images from the Hubble Space Telescope. One of the targets was previously classified a…
Constraining the Excitation of Molecular Gas in Two Quasar-starburst Systems at z ∼ 6
Fan, Xiaohui; Neri, Roberto; Menten, Karl M. +15 more
We present NOrthern Extended Millimeter Array observations of CO(8–7), (9–8), and (10–9) lines, as well as the underlying continuum for two far-infrared luminous quasars: SDSS J2054-0005 at z = 6.0389 and SDSS J0129-0035 at z = 5.7788. Both quasars were previously detected in CO (2–1) and (6–5) transitions, making them candidates for studying the …
Latitudinal Mapping of Chorus Waves Growth Rates Based on Multi-Spacecraft Wave and Plasma Measurements
Agapitov, O. V.; Artemyev, A.; Mourenas, D. +3 more
Whistler mode chorus waves are one of the most intense and important electromagnetic emissions in the Earth's radiation belt, where these waves are responsible for electron acceleration to relativistic energies and for energetic electron precipitation into the Earth's atmosphere. This study reports a unique multi-spacecraft observation event that …
A comprehensive study of an oscillating eclipsing Algol: Y Camelopardalis
Kahraman Aliçavuş, Filiz; Çelik, Eda
Y Camelopardalis (Y Cam) is classified as one of the oscillating eclipsing Algol (oEA) systems, which feature a $\delta$ Scuti-type pulsating component alongside mass transfer phenomena. oEA systems are invaluable for probing the evolutionary processes and internal structures of binary components, offering insights through their binary variations …