Search Publications
Three new Galactic globular cluster candidates: FSR1700, Teutsch67, and CWNU4193
Minniti, D.; Alonso-García, J.; Gómez, M. +3 more
The VISTA Variables in the Via Láctea Extended Survey (VVVX) enables exploration of previously uncharted territories within the inner Milky Way (MW), particularly those obscured by stellar crowding and intense extinction. Our objective is to identify and investigate new star clusters to elucidate their intrinsic characteristics. Specifically, we a…
The relation between magnetic field inclination and the apparent motion of penumbral grains
Sobotka, Michal; Jurčák, Jan; Castellanos Durán, Juan Sebastián +1 more
Context. The bright heads of penumbral filaments, penumbral grains (PGs), show apparent horizontal motions inward, toward the umbra, or outward, away from the umbra.
Aims: We aim to ascertain statistically whether the direction of PGs' apparent motion is related to the inclination of the surrounding magnetic field.
Methods: We used spect…
The enigma of Gaia18cjb: A possible rare hybrid of FUor and EXor properties
Pál, András; Ogłoza, Waldemar; Ábrahám, Péter +28 more
Context. Gaia18cjb is one of the Gaia-alerted eruptive young star candidates that has been experiencing a slow and strong brightening during the last 13 years, similarly to some FU Orionis-type objects.
Aims: The aim of this work is to derive the young stellar nature of Gaia18cjb and determine its physical and accretion properties to classify…
TOI-1135 b: A young hot Saturn-size planet orbiting a solar-type star
Nagel, E.; Béjar, V. J. S.; Zapatero Osorio, M. R. +20 more
Despite the thousands of planets in orbit around stars known to date, the mechanisms of planetary formation, migration, and atmospheric loss remain unresolved. In this work, we confirm the planetary nature of a young Saturn-size planet transiting a solar-type star every 8.03 d, TOI-1135 b. The age of the parent star is estimated to be in the inter…
Broadband X-ray spectral and timing properties of the accreting millisecond X-ray pulsar IGR J17498‑2921 during the 2023 outburst
Huang, Y.; Zhang, S.; Zhang, S. N. +10 more
We report on the broadband spectral and timing properties of the accreting millisecond X-ray pulsar IGR J17498‑2921 during its April 2023 outburst. We used data from NICER (1–10 keV), NuSTAR (3–79 keV), Insight-HXMT (2–150 keV), and INTEGRAL (30–150 keV). We detected significant 401 Hz pulsations across the 0.5–150 keV band. The pulse fraction inc…
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…
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…
Observational mapping of the mass discrepancy in eclipsing binaries: Selection of the sample and its photometric and spectroscopic properties
Bowman, Dominic M.; Tkachenko, Andrew; Gebruers, Sarah +4 more
Context. Eclipsing spectroscopic double-lined binaries are the prime source of precise and accurate measurements of masses and radii of stars. These measurements provide a stringent test for models of stellar evolution that are consistently reported to contain major shortcomings.
Aims: The mass discrepancy observed for eclipsing spectroscopic…