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A radical transition in the post-main-sequence system U Equulei
Menten, Karl M.; Szczerba, Ryszard; Iłkiewicz, Krystian +6 more
Context. U Equ is an unusual maser-hosting infrared source discovered in the 1990s. It was tentatively classified as a post-asymptotic giant branch (post-AGB) star with a unique optical spectrum displaying rare emission and absorption features from molecular gas at a temperature of about 500 K. In 2022, we serendipitously discovered that its optic…
A path towards constraining the evolution of the interstellar medium and outflows in the Milky Way using APOGEE
Ting, Yuan-Sen; Frankel, Neige; Sharda, Piyush
In recent years, the study of the Milky Way has significantly advanced due to extensive spectroscopic surveys of its stars, complemented by astroseismic and astrometric data. However, it remains disjoint from recent advancements in understanding the physics of the Galactic interstellar medium (ISM). This paper introduces a new model for the chemic…
Self-consistent modelling of the Milky Way structure using live potentials
Klessen, Ralf S.; Sormani, Mattia C.; Smith, Rowan J. +6 more
To advance our understanding of the evolution of the interstellar medium (ISM) of our Galaxy, numerical models of Milky Way (MW) type galaxies are widely used. However, most models only vaguely resemble the MW (e.g. in total mass), and often use imposed analytic potentials (which cannot evolve dynamically). This poses a problem in asserting their …
Coarse-Grained Ripples Investigated by the Opportunity Rover on Meridiani Planum, Mars
Kozakiewicz, J.; Dluzewski, M.; Rotnicka, J. +9 more
Aeolian coarse-grained ripples have been found in all regions investigated by Mars rovers: Meridiani Planum, Gusev crater, Gale crater, and Jezero crater. Therefore, it can be assumed that coarse-grained ripples are one of the most common landforms on Mars. Studying their formation and evolution gives us the opportunity to determine past and curre…
HYPERION. Shedding light on the first luminous quasars: A correlation between UV disc winds and X-ray continuum
Maiolino, R.; Fiore, F.; Done, C. +41 more
One of the main open questions in the field of luminous (Lbol > 1047 erg s‑1) quasars (QSOs) at z ≳ 6 is the rapid formation (< 1 Gyr) of their supermassive black holes (SMBHs). For this work we analysed the relation between the X-ray properties and other properties describing the physics and growth of both t…
Indications of magnetic accretion in Swift J0826.2‑7033
Mukai, Koji; Falanga, Maurizio; Masetti, Nicola +3 more
We present our findings from the first long X-ray observation of the hard X-ray source Swift J0826.2‑7033 with XMM-Newton, which has shown characteristics of magnetic accretion. The system appears to have a long orbital period (∼7.8 h) accompanied by short timescale variabilities, which we tentatively interpret as the spin and beat periods of an i…
HD 34736: an intensely magnetised double-lined spectroscopic binary with rapidly rotating chemically peculiar B-type components
Shulyak, D.; Wade, G. A.; Zejda, M. +21 more
We report the results of a comprehensive study of the spectroscopic binary (SB2) system HD 34736 hosting two chemically peculiar (CP) late B-type stars. Using new and archival observational data, we characterize the system and its components, including their rotation and magnetic fields. Fitting of the radial velocities yields
Mapping thermal emission in the synchrotron-dominated supernova remnants G330.2+1.0, 3C58, and RX J1713.7-3946
Mori, K.; Acero, F.; Williams, B. J. +1 more
Aims: Since the discovery of synchrotron X-ray emission from the shell of the supernova remnant (SNR) SN 1006, multiple observations from Chandra and XMM-Newton have shown that many young SNRs produce synchrotron emission in X-rays. Among those, a few peculiar SNRs have their X-ray emission largely dominated by synchrotron radiation, showing …
Seismic and spectroscopic analysis of nine bright red giants observed by Kepler
Valle, G.; Dell'Omodarme, M.; Prada Moroni, P. G. +21 more
Photometric time series gathered by space telescopes such as CoRoT and Kepler allow to detect solar-like oscillations in red giant stars and to measure their global seismic constraints, which can be used to infer global stellar properties (e.g. masses, radii, and evolutionary states). Combining such precise constraints with photospheric abundances…
Resolving the Periods of the Asynchronous Polar 1RXS J083842.1–282723
Halpern, J. P.
1RXS J083842.1‑282723 is a nearly synchronous magnetic cataclysmic variable with a simple X-ray light curve. While its orbital period was fairly well established at P orb = 98.4 minutes from optical spectroscopy, indirect estimates of P spin/P orb ranged from 0.90 to 0.96 because the short X-ray light curves could …