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Chemodynamic Analysis of Four r-Process Enhanced Stars Observed with GTC
Sivarani, Thirupathi; Saraf, Pallavi
Here, we delineate a comprehensive abundance analysis of four r-process enhanced metal-poor stars observed with HORuS spectrograph on a 10-m class telescope, GTC. The high signal-to-noise ratio at R≈25000 spectral resolution allowed us to detect 16 light and 20 neutron-capture elements along with Th in two stars. Four of our program stars show sig…
Climatology of gravity wave activity based on two Martian years from ACS/TGO observations
Montmessin, Franck; Starichenko, Ekaterina D.; Belyaev, Denis A. +6 more
Context. Gravity waves redistribute energy and momentum between the lower and upper atmosphere, thus providing vertical coupling between layers, and they affect the state, dynamics, and variability of the upper atmosphere. The statistics of gravity wave activity on Mars is poorly explored but is required in order to characterize the atmospheric ci…
Revisiting the abundance pattern and charge-exchange emission in the centre of M 82
Matsushita, K.; Fukushima, K.; Kobayashi, S. B.
Context. The interstellar medium (ISM) in starburst galaxies contains many chemical elements that are synthesised by core-collapse supernova explosions. By measuring the abundances of these metals, we can study the chemical enrichment within the galaxies and the transportation of metals into the circumgalactic environment through powerful outflows…
Understanding the universal dust attenuation scaling relation of star-forming galaxies
Zheng, Xian Zhong; An, Fang Xia; Xu, Haiguang +17 more
Star-forming galaxies (SFGs) adhere to a surprisingly tight scaling relation of dust attenuation parametrized by the infrared excess (IRX≡ LIR/LUV), being jointly determined by the star formation rate (SFR), galaxy size (Re), metallicity (Z/Z⊙), and axial ratio (b/a). We examine how these galaxy paramete…
Estimating Gradients Of Physical Fields In Space
Shen, Chao; Zhou, Yufei
This study focuses on the development of a multi-point technique for future constellation missions, aiming to measure gradients at various orders, in particular the linear and quadratic gradients, of a general field. It is well established that, in order to estimate linear gradients, the spacecraft must not lie on a plane. Through analytical explo…
An Elemental Abundance Diagnostic for Coordinated Solar Orbiter/SPICE and Hinode/EIS Observations
Matthews, Sarah A.; Warren, Harry P.; Brooks, David H. +2 more
Plasma composition measurements are a vital tool for the success of current and future solar missions, but density- and temperature-insensitive spectroscopic diagnostic ratios are sparse, and their underlying accuracy in determining the magnitude of the first ionization potential (FIP) effect in the solar atmosphere remains an open question. Here …
Peculiarities of the chemical enrichment of metal-poor stars in the Milky Way Galaxy★
Kniazev, A. Yu.; Soubiran, C.; Korotin, S. A. +5 more
Context. The oldest stars in the Milky Way are metal-poor with [Fe/H] < −1.0, displaying peculiar elemental abundances compared to solar values. The relative variations in the chemical compositions among stars is also increasing with decreasing stellar metallicity, allowing for the pure signature of unique nucleosynthesis processes to be reveal…
The colliding-wind binary HD 168112
Blomme, R.; Nazé, Y.; Rauw, G. +2 more
Context. Radio surveys of early-type stars have revealed a number of non-thermal emitters. Most of these have been shown to be binaries, where the collision between the two stellar winds is responsible for the non-thermal emission.
Aims: HD 168112 is a non-thermal radio emitter, whose binary nature has only recently been confirmed spectroscop…
Flickering pulsations in bright X-ray pulsars: the evidence of gravitationally lensed and eclipsed accretion column
Tsygankov, Sergey S.; Mushtukov, Alexander A.; Mereminskiy, Ilya A. +1 more
It is expected that the extreme mass accretion rate onto strongly magnetized neutron stars results in the appearance of accretion columns above the stellar surface. For a distant observer, rotation of a star results in periodic variations of X-ray flux. Because the mass accretion rate fluctuates around the average value, the pulse profiles are not…
Model-independent test of the running Hubble constant from the Type Ia supernovae and the Hubble parameter data
Zhang, Kaituo; Xu, Bing; Xu, Jiancheng +2 more
In this study, we model-independently investigate the behaviour of running Hubble constant, characterized by the fit function $H_{\rm 0}(z)=\tilde{H_{\rm {0}}}/(1+z)^{\alpha }$, where α represents the evolutionary parameter and ${\tilde{H_{\rm {0}}}}$ corresponds to the current value of Hubble constant. Our analysis utilizes the expansion rate E(z…