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Stragglers of the thick disc
Katz, D.; Haywood, M.; Royer, F. +2 more
Young alpha-rich (YAR) stars have been detected in the past as outliers to the local age − [α/Fe] relation. These objects are enhanced in α-elements, but they are apparently younger than typical thick disc stars. Here, we study the global kinematics and chemical properties of YAR giant stars in the APOGEE DR17 survey and show that they have proper…
Probing the timescale of the 1.4 GHz radio emissions as a star formation tracer
Magnelli, B.; Ilbert, O.; Ciesla, L. +3 more
Context. Radio used as a tracer of the star formation rate (SFR) presents enormous advantages because it is not affected by dust and radio sources that are located at the subarcsecond level. The interpretation of the low-frequency 1.4 GHz luminosity is hampered by the difficulty of modeling the paths of cosmic rays in the interstellar medium, howe…
Gaia Focused Product Release: Sources from Service Interface Function image analysis. Half a million new sources in omega Centauri
Prusti, T.; Mazeh, T.; Zucker, S. +400 more
Context. Gaia's readout window strategy is challenged by very dense fields in the sky. Therefore, in addition to standard Gaia observations, full Sky Mapper (SM) images were recorded for nine selected regions in the sky. A new software pipeline exploits these Service Interface Function (SIF) images of crowded fields (CFs), making use of the availa…
Timing the formation of the galactic thin disc with asteroseismic stellar ages
Zhao, Gang; Wu, Yaqian; Xiang, Maosheng +3 more
The formation of the extended thin disc is the most spectacular event of our Galaxy in the past ~8 Gyr. To unveil this process, obtaining precise and accurate stellar ages for a large sample of stars is essential although challenging. In this work, we present the asteroseismic age determination of 5306 red giant branch stars using Kepler and LAMOS…
Minute-cadence observations of the LAMOST fields with the TMTS: II. Catalogues of short-period variable stars from the first 2-yr surveys
Filippenko, Alexei V.; Wang, Xiaofeng; Németh, Péter +25 more
Over the past few years, wide-field time-domain surveys such as Zwicky Transient Facility and Optical Gravitational Lensing Experiment have led to discoveries of various types of interesting short-period stellar variables, such as ultracompact eclipsing binary white dwarfs (WDs), rapidly rotating magnetized WDs, transitional cataclysmic variables …
Measuring the hot ICM velocity structure function using XMM-Newton observations
Pinto, C.; Federrath, C.; Sanders, J. S. +4 more
It has been shown that the gas velocities within the intracluster medium (ICM) can be measured by applying the novel XMM-Newton EPIC-pn energy scale calibration, which uses instrumental Cu Kα as reference for the line emission. Using this technique, we have measured the velocity distribution of the ICM for clusters involving AGN feedback and slosh…
Iron-peak Element Abundances in Warm Very Metal-poor Stars
Roederer, Ian U.; Sneden, Christopher; Cowan, John J. +3 more
We have derived new detailed abundances of Mg, Ca, and the Fe-group elements Sc through Zn (Z = 21-30) for 37 main-sequence turnoff very metal-poor stars ([Fe/H] ≲-2.1). We analyzed Keck HIRES optical and near-UV high signal-to-noise spectra originally gathered for a Be abundance survey. Using typically ~400 Fe-group lines with accurate laboratory…
Wavefront error of PHI/HRT on Solar Orbiter at various heliocentric distances
Woch, J.; Solanki, S. K.; Schou, J. +31 more
Aims: We use wavefront sensing to characterise the image quality of the High Resolution Telescope (HRT) of the Polarimetric and Helioseismic Imager (SO/PHI) data products during the second remote sensing window of the Solar Orbiter (SO) nominal mission phase. Our ultimate aims are to reconstruct the HRT data by deconvolving with the HRT point…
Probing sub-galactic mass structure with the power spectrum of surface-brightness anomalies in high-resolution observations of galaxy-galaxy strong gravitational lenses - I. Power-spectrum measurement and feasibility study
Vegetti, S.; McKean, J. P.; Treu, T. +4 more
While the direct detection of the dark-matter particle remains very challenging, the nature of dark matter could be possibly constrained by comparing the observed abundance and properties of small-scale sub-galactic mass structures with predictions from the phenomenological dark-matter models, such as cold, warm, or hot dark matter. Galaxy-galaxy …
The Colorado Ultraviolet Transit Experiment Mission Overview
France, Kevin; Fleming, Brian; Hoadley, Keri +18 more
Atmospheric escape is a fundamental process that affects the structure, composition, and evolution of many planets. The signatures of escape are detectable on close-in, gaseous exoplanets orbiting bright stars, owing to the high levels of extreme-ultraviolet irradiation from their parent stars. The Colorado Ultraviolet Transit Experiment (CUTE) is…