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DW Cnc: a micronova with a negative superhump and a flickering spin
Altamirano, D.; Knigge, C.; de Martino, D. +14 more
Magnetic accreting white dwarfs in cataclysmic variables have been known to show bursts driven by different physical mechanisms; however, the burst occurrence is much rarer than in their non-magnetic counterparts. DW Cnc is a well-studied intermediate polar that showed a burst with a 4-magnitude amplitude in 2007. Here we report on a recent burst …
Astrometric observations of Phoebe from 2010 to 2019 based on Gaia DR3
Cheng, X.; Zhang, H. Y.; Yan, D. +2 more
A total of 914 positions of Phoebe were collected from 2010 to 2019 with three different telescopes, which were the 1.56 m telescope at the Sheshan station of Shanghai Astronomical Observatory, the 1.0 m telescope at the Kunming station of Yunnan Astronomical Observatory and the 2.4 m telescope at the Lijiang station of Yunnan Astronomical Observa…
A Study of the Star Clusters' Population in the Giant Molecular Cloud G174+2.5
Carraro, Giovanni; Kirsanova, Maria S.; Sobolev, Andrej M. +3 more
We study the structure, interstellar absorption, color–magnitude diagrams (CMDs), kinematics, and dynamical state of embedded star clusters in the star-forming region associated with the giant molecular cloud G174+2.5. Our investigation is based on photometric data from the UKIDSS Galactic Plane Survey catalog and astrometric data from the Gaia DR…
Observations and Quantitative Compositional Analysis of Ceres, Pallas, and Hygiea Using JWST/NIRSpec
Ehlmann, Bethany L.; Rivkin, Andrew S.; Hammel, Heidi B. +6 more
We present JWST Near Infrared Spectrograph (NIRSpec) measurements of the three largest low-albedo main-belt asteroids: (1) Ceres, (2) Pallas, and (10) Hygiea. Their reflectance spectra all have very similar absorptions centered near 2.72 µm attributed to Mg–OH in minerals. Within this band, Pallas also shows evidence of a sharper, deeper ban…
Long-period Double-lined Eclipsing Binaries: The System V454 Aur with the Secondary Eclipse Caused by the Occultation of the Hotter Component
Kniazev, Alexei Y.; Malkov, Oleg; Berdnikov, Leonid N. +2 more
We present the results of our study of the long-period eclipsing binary star V454 Aur. The results are based on spectroscopic data obtained with the UFES échelle spectrograph and photometric observations from Transiting Exoplanet Survey Satellite (TESS). The derived radial velocity curve is based on 17 spectra obtained between 2021 and 2023, cover…
Spectroscopic observations of flares and superflares on AU Mic
Heinzel, P.; Guenther, E. W.; Skarka, M. +13 more
The young active flare star AU Mic is the planet host star with the highest flare rate from Transiting Exoplanet Survey Satellite data. Therefore, it represents an ideal target for dedicated ground-based monitoring campaigns with the aim to characterize its numerous flares spectroscopically. We performed such spectroscopic monitoring with the ESO1…
Kalkayotl 2.0: Bayesian phase-space modelling of star-forming regions, stellar associations, and open clusters
Bouy, H.; Berihuete, A.; Olivares, J. +1 more
Context. Star-forming regions, stellar associations, and open clusters are fundamental stellar systems where predictions from star-formation theories can be robustly contrasted with observations. Aims. We aim to provide the astrophysical community with a free and open-source code to infer the phase-space (i.e. positions and velocities) parameters …
Investigating the Lower Limit of Metallicity for the Galactic Thin Disk
Cui, Wenyuan; Hu, Guozhen; Shao, Zhengyi +1 more
We explore the metal-poor regime of the Galactic disk on the distribution of stars in the [α/M]–Vϕ plane, to identify the most metal-poor thin disk (MPTnD) stars belonging to the low-α sequence. Chemical abundances and velocities of sample stars are either taken or derived from APOGEE DR17 and Gaia DR3 catalogs. We find the existence of…
Radio emission from a massive node of the cosmic web: A discovery powered by machine learning
Gavazzi, R.; Botteon, A.; Umetsu, K. +4 more
Context. The recent detection of radio emission extending beyond the scales typically associated with radio halos challenges our understanding of how energy is transferred to the non-thermal components on the outskirts of galaxy clusters, suggesting the crucial role of mass accretion processes. So far, discoveries have relied on the visual identif…
Influence of a continuous plane gravitational wave on Gaia-like astrometry
Klioner, S. A.; Lindegren, L.; Geyer, R. +1 more
Context. A gravitational wave (GW) passing through an astrometric observer causes periodic shifts of the apparent star positions measured by the observer. For a GW of sufficient amplitude and duration, at a suitable frequency, these shifts might be detected with a Gaia-like astrometric telescope. Aims. This paper is aimed at making a detailed anal…