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Discovery and description of two young open clusters in the primordial group of NGC 6871
Casado, Juan; Hendy, Yasser
A primordial group of open clusters containing NGC 6871 is confirmed and described through Gaia DR3 data and the previous literature. It is a star-forming complex containing at least six young open clusters (OCs), including Teutsch 8, FSR 198, and Biurakan 2. Two nearby OCs (Casado 82 and Casado-Hendy 1) are newly identified and studied in detail …
Spectroscopic and evolutionary analyses of the binary system AzV 14 outline paths toward the WR stage at low metallicity
Hamann, W. -R.; Oey, M. S.; Mehner, A. +16 more
Context. The origin of the observed population of Wolf-Rayet (WR) stars in low-metallicity galaxies, such as the Small Magellanic Cloud (SMC), is not yet understood. Standard, single-star evolutionary models predict that WR stars should stem from very massive O-type star progenitors, but these are very rare. On the other hand, binary evolutionary …
Wide Binaries as a Modified Gravity test: prospects for detecting triple-system contamination
Manchanda, Dhruv; Sutherland, Will; Pittordis, Charalambos
Recent studies have shown that velocity differences of very wide binary stars, measured to high precision with GAIA, can provide an interesting test for modified-gravity theories which emulate dark matter; in essence, MOND-like theories (with external field effect included) predict that wide binaries (wider than ~ 7 kAU) should orbit ~ 15% faster …
What does a typical full disc around a post-AGB binary look like?. Radiative transfer models reproducing PIONIER, GRAVITY, and MATISSE data
Min, M.; Van Winckel, H.; Kamath, D. +2 more
Context. Stable circumbinary discs around evolved post-asymptotic giant branch (post-AGB) binary systems composed of gas and dust show many similarities with protoplanetary discs around young stellar objects. These discs can provide constraints on both binary evolution and the formation of macrostructures within circumstellar discs. Here we focus …
Classifying the satellite plane membership of Centaurus A's dwarf galaxies using orbital alignment constraints
Müller, Oliver; Sohn, Sangmo Tony; Pawlowski, Marcel S. +1 more
The flattened, possibly co-rotating plane of satellite galaxies around Centaurus A, if more than a fortuitous alignment, adds to the pre-existing tension between the well-studied Milky Way and M31 planes and the Lambda cold dark matter model of structure formation. It was recently reported that the Centaurus A satellite plane (CASP) may be rotatio…
ALMA Gas-dynamical Mass Measurement of the Supermassive Black Hole in the Red Nugget Relic Galaxy PGC 11179
Ho, Luis C.; Gebhardt, Karl; Barth, Aaron J. +10 more
We present 0.″22-resolution Atacama Large Millimeter/submillimeter Array (ALMA) observations of CO(2-1) emission from the circumnuclear gas disk in the red nugget relic galaxy PGC 11179. The disk shows regular rotation, with projected velocities near the center of 400 km s-1. We assume the CO emission originates from a dynamically cold,…
Investigating the origin of optical and X-ray pulsations of the transitional millisecond pulsar PSR J1023+0038
Campana, S.; Stella, L.; de Martino, D. +21 more
Context. PSR J1023+0038 is the first millisecond pulsar that was ever observed as an optical and UV pulsar. So far, it is the only optical transitional millisecond pulsar. The rotation- and accretion-powered emission mechanisms hardly individually explain the observed characteristics of optical pulsations. A synergistic model, combining these stan…
Oxygen-bearing organic molecules in comet 67P's dusty coma: First evidence for abundant heterocycles
Altwegg, K.; Fuselier, S. A.; Rubin, M. +6 more
The puzzling complexity of terrestrial biomolecules is driving the search for complex organic molecules in the interstellar medium (ISM) and serves as a motivation for many in situ studies of reservoirs of extraterrestrial organics, from meteorites and interplanetary dust particles to comets and asteroids. Comet 67P/Churyumov-Gerasimenko (67P), th…
Young Radio Sources Expanding in Gas-Rich ISM: Using Cold Molecular Gas to Trace Their Impact
Morganti, Raffaella; Oosterloo, Tom; Murthy, Suma +2 more
We present an overview of the results obtained from the study of the resolved distribution of molecular gas around eight young (≲106yr), peaked-spectrum radio galaxies. Tracing the distribution and kinematics of the gas around these radio sources allows us to trace the interplay between the jets and the surrounding medium. For three of these sourc…
Multiples among B stars in the Scorpius-Centaurus association
D'Orazi, V.; Nascimbeni, V.; Janson, M. +14 more
Context. The frequency, semi-major axis, and mass distribution of stellar companions likely depend on the mass of the primaries and on the environment where the stars form. These properties are very different for early- and late-type stars. However, data are largely incomplete, even for the closest environments to the Sun, preventing a cleaner vie…