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The Gaia-ESO survey: 3D NLTE abundances in the open cluster NGC 2420 suggest atomic diffusion and turbulent mixing are at the origin of chemical abundance variations
(European Southern Observatory, 2020)
Context. Atomic diffusion and mixing processes in stellar interiors influence the structure and the surface composition of stars. Some of these processes cannot yet be modelled from the first principles, and they require ...
Evidence for reduced magnetic braking in polars from binary population models
(Royal Astronomical Society, 2020)
We present the first population synthesis of synchronous magnetic cataclysmic variables, called polars, taking into account the effect of the white dwarf (WD) magnetic field on angular momentum loss. We implemented the ...
The Gaia-ESO Survey: membership probabilities for stars in 32 open clusters from 3D kinematics
(Royal Astronomical Society, 2020)
The Gaia-ESO Survey (GES) observed many open clusters as part of its programme to spectroscopically characterize the various Milky Way populations. GES spectroscopy and Gaia astrometry from its second data release are used ...
The Gaia-ESO survey: Mixing processes in low-mass stars traced by lithium abundance in cluster and field stars
(European Southern Observatory (ESO), 2021)
Aims. We aim to constrain the mixing processes in low-mass stars by investigating the behaviour of the Li surface abundance after the main sequence. We take advantage of the data from the sixth internal data release of ...
Orbital and atmospheric parameters of two wide O-type subdwarf binaries: BD−11o162 and Feige 80
(European Southern Observatory (ESO), 2022)
Context. There are 23 long-period binary systems discovered to date that contain a B-type hot subdwarf whose orbital parameters have been fully solved. They evolve into O-type subdwarfs (sdO) once the helium burning ...
A massive open cluster hiding in full sight
(Royal Astronomical Society, 2021)
Obscuration and confusion conspire to limit our knowledge of the inner MilkyWay. Even atmoderate distances, the identification of stellar systems becomes compounded by the extremely high density of background sources. Here, ...
The White Dwarf Binary Pathways Survey – IV. Three close white dwarf binaries with G-type secondary stars
(Royal Astronomical Society, 2021)
Constraints from surveys of post-common envelope binaries (PCEBs) consisting of a white dwarf plus an M-dwarf companion have led to significant progress in our understanding of the formation of close white dwarf binary ...
About the existence of warm H-rich pulsating white dwarfs
(European Southern Observatory (ESO), 2020)
Context. The possible existence of warm (Teff ∼ 19 000 K) pulsating DA white dwarf (WD) stars, hotter than ZZ Ceti stars, was predicted in theoretical studies more than 30 yr ago. These studies reported the occurrence of ...
Pulsating hydrogen-deficient white dwarfs and pre-white dwarfs observed with TESS. I. Asteroseismology of the GW Vir stars RX J2117+3412, HS 2324+3944, NGC 6905, NGC 1501, NGC 2371, and K 1−16
(European Southern Observatory (ESO), 2021)
Context. The recent arrival of continuous photometric observations of unprecedented quality from space missions has strongly promoted the study of pulsating stars and caused great interest in the stellar astrophysics ...
Asteroseismic analysis of variable hot subdwarf stars observed with TESS
(European Southern Observatory (ESO), 2021)
Context. We present photometric and spectroscopic analyses of gravity (g-mode) long-period pulsating hot subdwarf B (sdB) stars, also called V1093 Her stars, observed by the TESS space telescope in both 120 s short-cadence ...