Search Publications
Properties of the interstellar medium in star-forming galaxies at redshifts 2 ≤ z ≤ 5 from the VANDELS survey
Schaerer, D.; Castellano, M.; Pentericci, L. +16 more
Gaseous flows inside and outside galaxies are key to understanding galaxy evolution, as they regulate their star formation activity and chemical enrichment across cosmic time. We study the interstellar medium (ISM) kinematics of a sample of 330 galaxies with C III] or He II emission using far-ultraviolet (far-UV) ISM absorption lines detected in t…
Localizing narrow Fe Kα emission within bright AGN
Brandt, William N.; Ricci, Claudio; Bauer, Franz E. +11 more
Context. The 6.4 keV Fe Kα emission line is a ubiquitous feature in X-ray spectra of active galactic nuclei (AGN), and its properties track the interaction between the variable primary X-ray continuum and the surrounding structure from which it arises.
Aims: We clarify the nature and origin of the narrow Fe Kα emission using X-ray spectral, t…
Eclipse of the V773 Tau B circumbinary disc
Ginski, C.; Mugrauer, M.; Vogt, N. +9 more
Context. Young multiple stellar systems can host both circumstellar and circumbinary discs composed of gas and dust, and the orientations of circumbinary discs can be sculpted by the orientation and eccentricity of the central binaries. Studying multiple binary systems and their associated discs enables our understanding of the size and distributi…
Constraints to neutron-star kicks in high-mass X-ray binaries with Gaia EDR3
García, Federico; Chaty, Sylvain; Fortin, Francis +2 more
Context. All neutron star progenitors in neutron-star high-mass X-ray binaries (NS HMXBs) undergo a supernova event that may lead to a significant natal kick impacting the motion of the whole binary system. The space observatory Gaia performs a deep optical survey with exquisite astrometric accuracy, for both position and proper motions, that can …
Barium stars as tracers of s-process nucleosynthesis in AGB stars. I. 28 stars with independently derived AGB mass
Pereira, C. B.; Cseh, B.; D'Orazi, V. +7 more
Context. Barium (Ba) stars are polluted by material enriched in the slow neutron capture (s-process) elements synthesised in the interior of their former asymptotic giant branch (AGB) companion star, which is now a white dwarf.
Aims: We aim to compare individual Ba star abundance patterns to AGB nucleosynthesis model predictions to verify if …
Accretion variability from minute to decade timescales in the classical T Tauri star CR Cha
Pál, A.; Ábrahám, P.; Kóspál, Á. +6 more
Context. Classical T Tauri stars are pre-main-sequence stars that are surrounded by a circumstellar disk from which they accrete material. The mass accretion process is essential in the formation of Sun-like stars. Although often described with simple and static models, the accretion process is inherently time variable.
Aims: We examine the a…
HD 133729: A blue large-amplitude pulsator in orbit around a main-sequence B-type star
Pigulski, A.; Kotysz, K.; Kołaczek-Szymański, P. A.
Blue large-amplitude pulsators (BLAPs) form a small group of hot objects pulsating in a fundamental radial mode with periods of the order of 30 min. Proposed evolutionary scenarios explain them as evolved low-mass stars: ∼0.3 M⊙ shell-hydrogen-burning objects with a degenerated helium core, more massive (0.5-0.8) M⊙ core-heli…
Total reflection of a flare-driven quasi-periodic extreme ultraviolet wave train at a coronal hole boundary
Shen, Yuandeng; Zhou, Chengrui; Zhou, Xinping +3 more
Context. A flare-driven quasi-periodic extreme ultraviolet wave train totally reflected at a coronal hole boundary was well imaged on both temporal and spatial scales by AIA/SDO.
Aims: We aim to investigate the driving mechanisms of the quasi-periodic wave train and demonstrate the total reflection effect at the coronal hole boundary.
Me…
The SEDIGISM survey: The influence of spiral arms on the molecular gas distribution of the inner Milky Way
König, C.; Menten, K. M.; Henning, T. +23 more
The morphology of the Milky Way is still a matter of debate. In order to shed light on uncertainties surrounding the structure of the Galaxy, in this paper, we study the imprint of spiral arms on the distribution and properties of its molecular gas. To do so, we take full advantage of the SEDIGISM (Structure, Excitation, and Dynamics of the Inner …
The period-age relation of long-period variables
Mowlavi, N.; Trabucchi, M.
Context. Pieces of empirical evidence suggest the existence of a period-age relation for long-period variables (LPVs). Yet, this property has hardly been studied on theoretical grounds thus far.
Aims: We aim to examine the period-age relation using the results from recent nonlinear pulsation calculations.
Methods: We combined isochrone m…