Search Publications
The outburst of the changing-look AGN IRAS 23226-3843 in 2019
Schartel, N.; Komossa, S.; Kollatschny, W. +8 more
Aims: IRAS 23226-3843 has previously been classified as a changing-look active galactic nucleus (AGN) based on observations taken in the 1990s in comparison to X-ray data (Swift, XMM-Newton, and NuSTAR) and optical spectra taken after a very strong X-ray decline in 2017. In 2019, Swift observations revealed a strong rebrightening in X-ray and…
Backstreaming ions at a high Mach number interplanetary shock. Solar Orbiter measurements during the nominal mission phase
Vainio, R.; Owen, C. J.; Wimmer-Schweingruber, R. F. +9 more
Context. Solar Orbiter, a mission developed by the European Space Agency, explores in situ plasma across the inner heliosphere while providing remote-sensing observations of the Sun. The mission aims to study the solar wind, but also transient structures such as interplanetary coronal mass ejections and stream interaction regions. These structures…
Combining HIPPARCOS and Gaia data for the study of binaries: The BINARYS tool
Arenou, F.; Babusiaux, C.; van Leeuwen, F. +6 more
Context. Orbital motion in binary and planetary systems is the main source of precise stellar and planetary mass measurements, and the joint analysis of data obtained using multiple observational methods can both lift degeneracies and improve precision.
Aims: We set out to measure the masses of individual stars in binary systems using all the…
Photometric metallicity for 694 233 Galactic giant stars from Gaia DR3 synthetic Strömgren photometry. Metallicity distribution functions of halo substructures
Massari, D.; De Angeli, F.; Riello, M. +4 more
We used two previous calibrations and the standardised synthetic photometry in the v, b, and y Strömgren passbands from Gaia DR3 BP/RP spectra to obtain photometric metallicities for a selected sample of 694 233 old Galactic giant stars having |b|> 20.0° and parallax uncertainties lower than 10%. The zero point of both sets of photometric metal…
Calibrating angular momentum transport in intermediate-mass stars from gravity-mode asteroseismology
Mombarg, J. S. G.
Context. The physical mechanisms driving the transport of angular momentum in stars are not fully understood, as current models cannot explain the observed stellar rotation profiles across all stages of evolution.
Aims: By making use of pulsating F-type dwarfs, we aim to (i) observationally calibrate the efficiency of angular momentum transpo…
The slippery slope of dust attenuation curves. Correlation of dust attenuation laws with star-to-dust compactness up to z = 4
Ciesla, L.; Buat, V.; Małek, K. +5 more
Aims: We investigate the dust attenuation of 122 heavily dust-obscured galaxies detected with the Atacama Large Millimeter Array (ALMA) and Herschel in the COSMOS field. We search for correlations between dust attenuation recipes and the variation of physical parameters, namely, the effective radii of galaxies, their star formation rates, and…
Evidence of external reconnection between an erupting mini-filament and ambient loops observed by Solar Orbiter/EUI
Barczynski, K.; Peter, H.; Chitta, L. P. +16 more
Mini-filament eruptions are one of the most common small-scale transients in the solar atmosphere. However, their eruption mechanisms are still not understood thoroughly. Here, with a combination of 174 Å images of high spatio-temporal resolution taken by the Extreme Ultraviolet Imager on board Solar Orbiter and images of the Atmospheric Imaging A…
New insights into the rotational evolution of near-solar age stars from the open cluster M 67
Gruner, D.; Barnes, S. A.; Weingrill, J.
Context. Gyrochronology allows the derivation of ages for cool main sequence stars from their observed rotation periods and masses, or a suitable proxy of the latter. It is increasingly well explored for FGK stars, but requires further measurements for older ages and K-M-type stars.
Aims: Recent work has shown that the behavior of stellar spi…
A ∼15 kpc outflow cone piercing through the halo of the blue compact metal-poor galaxy SBS 0335-052E
Östlin, G.; Hayes, M.; Monreal-Ibero, A. +11 more
Context. Outflows from low-mass star-forming galaxies are a fundamental ingredient for models of galaxy evolution and cosmology. Despite seemingly favourable conditions for outflow formation in compact starbursting galaxies, convincing observational evidence for kiloparsec-scale outflows in such systems is scarce.
Aims: The onset of kiloparse…
Power-2 limb-darkening coefficients for the uvby, UBVRIJHK, SDSS ugriz, Gaia, Kepler, TESS, and CHEOPS photometric systems. II. PHOENIX spherically symmetric stellar atmosphere models
Southworth, J.; Claret, A.
Context. The phenomenon of limb-darkening is relevant to many topics in astrophysics, including the analysis of light curves of eclipsing binaries, optical interferometry, measurement of stellar diameters, line profiles of rotating stars, gravitational microlensing, and transits of extrasolar planets
Aims: Multiple parametric limb-darkening l…