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The Astrometric Performance of the China Space Station Telescope (CSST) Sky Survey in Extending the Gaia Celestial Reference Frame
Zhu, Zi; Yao, Jun; Liu, Niu +2 more
The multi-color imaging sky survey conducted by the China Space Station Telescope (CSST) holds significant promise for advancing the development of the celestial reference frame. In this study, we focus on assessing the astrometric performance of the CSST celestial reference frame (CSST-CRF) in extending the Gaia Celestial Reference Frame 3 (Gaia-…
He abundance in NGC 1850 A and B: Are we observing the early stage of the formation of multiple populations in a stellar cluster?
Biazzo, K.; Brocato, E.; Sollima, A. +1 more
We present the results for a sample of B stars in the Large Magellanic Cloud young double stellar cluster NGC 1850 A and NGC 1850 B, as observed with the integral-field spectrograph at the Very Large Telescope, the Multi Unit Spectroscopic Explorer (MUSE). We compare the observed equivalent widths (EWs) of four He lines (4922, 5015, 6678, and 7065…
Asymmetric Hard X-ray Radiation of Two Ribbons in a Thermal-Dominated C-Class Flare
Lei, Shijun; Feng, Li; Lu, Lei +26 more
The asymmetry in hard X-ray (HXR) emission at the footpoints (FPs) of flare loops is a ubiquitous feature closely associated with nonthermal electron transport. In this study, we analyze the asymmetric HXR radiation at two flare ribbons, which is thermal-dominated during a long-duration C4.4 flare that occurred on March 20, 2023, combining multi-v…
The interplay between disk wind and magnetospheric accretion mechanisms in the innermost environment of RU Lup
Labadie, L.; Dougados, C.; Bouvier, J. +10 more
Context. Hydrogen recombination lines such as Brγ are tracers of hot gas within the inner circumstellar disk of young stellar objects (YSOs). In the relatively cool innermost environment of T Tauri stars specifically, Brγ emission is closely associated with magnetically driven processes, such as magnetospheric accretion. Magnetospheric emission al…
Neutron-capture elements in a sample of field metal-poor N-rich dwarfs
Bonifacio, P.; Caffau, E.; Spite, M. +1 more
Context. The aim of this work is to measure the abundances of n-capture elements in a sample of six metal-poor N-rich dwarfs that were formed in globular clusters, and subsequently became unbound from the cluster. These N-rich stars, HD 25329, HD 74000, HD 160617, G 24-3, G53-41, and G90-3, were previously studied in Paper I.
Aims: The abunda…
Asteroseismology of the fast-rotating high-amplitude δ Scuti star V2367 Cygni
Daszyńska-Daszkiewicz, J.; Walczak, P.; Szewczuk, W.
We present the comprehensive analysis of the high-amplitude $\delta$ Sct star V2367 Cygni. First, we perform the frequency analysis for the whole available set of the Kepler and TESS photometry. Most of the frequency peaks are harmonics or combinations of the three known independent frequencies with the highest amplitudes, i.e.$\nu _1=5.661\,06$ d…
Probing ultralight primordial black hole dark matter with XMM telescopes
Yuan, Qiang; Guo, Jun; Zhu, Bin
Primordial black holes (PBHs), originating from the gravitational collapse of large overdensities in the early Universe, emerge as a compelling dark matter (DM) candidate across a broad mass range. Of particular interest are ultra-light PBHs with masses around 1014 to 1017 g, which are typically probed by searching their evap…
Rotational Study of 5:3 and 7:4 Resonant Objects within the Main Classical Trans-Neptunian Belt
Thirouin, Audrey; Sheppard, Scott S.
The 5:3 and 7:4 mean motion resonances of Neptune are at 42.3 and 43.7 au, respectively, and overlap with objects in the classical trans-Neptunian belt (Kuiper Belt). We report the complete/partial lightcurves of 13 and 14 trans-Neptunian objects (TNOs) in the 5:3 and 7:4 resonances, respectively. We report a most likely contact binary in the 7:4 …
Variable Stars in M31 Stellar Clusters from the Panchromatic Hubble Andromeda Treasury
Williams, Benjamin F.; Johnson, L. Clifton; Girardi, Léo +9 more
Variable stars in stellar clusters can offer key constraints on stellar evolution and pulsation models, utilizing estimates of host cluster properties to constrain stellar physical parameters. We present a catalog of 86 luminous (F814W < 19) variable stars in M31 clusters identified by mining the archival Panchromatic Hubble Andromeda Treasury …
Fe II fluorescence in main-sequence K-dwarfs
Eriksson, M.
Main-sequence K-dwarfs possess strong emission in the form of the H I Ly α line. There is a close coincidence between the energy corresponding to the transitions H I 1s-2p and Fe II (5D)5s 4D5/2-(5D)5p 4D5/2. Singly ionized iron has been confirmed being pumped by photo-excitation by…