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Study of 26 Galactic Open Clusters with Extended Main-sequence Turnoffs
Li, Zhong-Mu; Deng, Yang-Yang
Recent studies indicate that some Galactic open clusters (OCs) exhibit extended main-sequence turnoff (eMSTO) in their color–magnitude diagrams (CMDs). However, the number of Galactic OCs with eMSTO structures detected so far is limited, and the reasons for their formation are still unclear. This work identifies 26 Galactic OCs with undiscovered e…
A Study of Interstellar Medium in the Line of Sight of Transient Neutron Star Low-Mass X-ray Binary, MXB 1659-298, by Timing and Spectral Analysis
Mahato, Rabindra; Baruah, Monmoyuri; Bhattacharya, Parag
This work is dedicated to the study of interstellar medium (ISM) along the line of sight (LOS) of the transient low-mass X-ray binary, MXB 1659-298, capitalizing the high resolving power of XMM-Newton in the soft energy range. We emphasized the analysis of reflection grating spectrometer (RGS) data in the energy range 0.5–2.15 keV, suitable for th…
Embedded Star Catalog Calculation Tool for Autonomous Star Trackers
Bürger, Karoline C.; Fialho, Fábio de O.; Aykroyd, Christopher R. B.
Autonomous star trackers are crucial attitude sensors for spacecraft three-axis control. They are the most accurate commercial-off-the-shelf sensors available. An autonomous star tracker is an optoelectronic device that autonomously determines the spacecraft's attitude, using an embedded star catalog that is compared to in-orbit images to perform …
Terrestrial and Martian space weather: A complex systems approach
Blanco-Cano, Xóchitl; Stepanova, Marina; Mazelle, Christian +19 more
A comparative overview of Terrestrial and Martian space weather is presented, with emphasis on applying the tools of complexity and nonlinear dynamics to study the spatiotemporal dynamics and structures of sun–Earth and sun–Mars space environment. The following topics are reviewed: (1) complex systems approach to solar atmosphere and solar wind; (…
Identification and Distance Measurement of Dust Clouds at High Latitude by a Clustering Hierarchical Algorithm
Jiang, Biwei; Cui, Wenyuan; Sun, Mingxu +1 more
We present a catalog of dust clouds at high Galactic latitude based on the Planck 857 GHz dust emission data. Using a clustering hierarchical algorithm, 315 dust clouds at high Galactic latitudes are identified. Additionally, using the optical and ultraviolet extinction of 4 million and 1 million stars, respectively, provided by Sun et al., we der…
Combining magneto-hydrostatic constraints with Stokes profile inversions. IV. Imposing ∇⋅B = 0 condition
Pastor Yabar, A.; Ruiz Cobo, B.; Borrero, J. M.
Context. Inferences of the magnetic field in the solar atmosphere by means of spectropolarimetric inversions (i.e., Stokes inversion codes) yield magnetic fields that are non-solenoidal (∇ ⋅ B ≠ 0). Because of this, results obtained by such methods are sometimes put into question.
Aims: We aim to develop and implement a new technique that, in…
Low abundances of TiO and VO on the dayside of KELT-9 b: Insights from ground-based photometric observations
Ikuta, Kai; Fukui, Akihiko; Narita, Norio +21 more
We present ground-based photometric observations of secondary eclipses of the hottest known planet KELT-9 b using MuSCAT2 and Sinistro. We detect secondary eclipse signals in i and
High-accuracy polarization measurements of the white-light corona during the 2023 total solar eclipse
Hanaoka, Yoichiro; Sakai, Yoshiaki; Masuda, Yukio
This study measured the polarization of the white-light corona during the total solar eclipse on 20 April 2023, which occurred under high solar activity. The same instrument that was used for the 2017 and 2019 eclipse observations was employed, and despite the short duration of totality, the obtained data could be used for high-accuracy polarizati…
Constraints on Testing Post-Newtonian Gravity with Scanning Space Astrometry
Bucciarelli, Beatrice; Lattanzi, Mario G.; Crosta, Mariateresa +4 more
High-precision astrometry has the capability of testing General Relativity in the framework of the parametrized post-Newtonian formalism (PPN). Accurate measurements of gravitational light deflection over the entire celestial sphere open up a potential opportunity for determining the post-Newtonian parameter γ, which governs the deflection strengt…
The VANDELS Survey: Star formation and quenching in two over-densities at 3 < z < 4
Demarco, R.; Castellano, M.; Pentericci, L. +11 more
Context. Exploring galaxy evolution in dense environments, such as proto-clusters, is pivotal for understanding the mechanisms that drive star formation and the quenching of star formation. Aims. This study provides insights into how two over-densities could have impacted the physical properties, such as the star formation rate, stellar mass, morp…