A5045136093- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astro and Planetary Science
- Astrophysical Phenomena and Observations
- Astronomical Observations and Instrumentation
- Astrophysics and Star Formation Studies
- High-pressure geophysics and materials
- Pulsars and Gravitational Waves Research
- Marine and environmental studies
- Relativity and Gravitational Theory
- Geomagnetism and Paleomagnetism Studies
- Geological and Geochemical Analysis
- Geophysics and Gravity Measurements
- History and Developments in Astronomy
Université Libre de Bruxelles
2023
The Gaia DR3 Catalogue contains for the first time about eight hundred thousand solutions with either orbital elements or trend parameters astrometric, spectroscopic and eclipsing binaries, combinations of them. This paper aims to illustrate huge potential this large non-single star catalogue. Using together models a catalogue tens thousands stellar masses, lower limits, partly consistent flux ratios, has been built. Properties concerning completeness binary catalogues are discussed,...
T Coronæ Borealis (T CrB) is a symbiotic recurrent nova with an 80-year recurrence interval whose next eruption imminent. We aim to resolve the accretion mechanism of binary system governing mass transfer during its super-active phase. Using phase-resolved high-resolution spectroscopy, we analyzed zoo spectral-line profiles arising from activity. performed Doppler tomography selected emission lines system's gaseous components and their different velocity regimes. find evidence enhanced...
T Coronae Borealis (T CrB) is a symbiotic recurrent nova with an 80-year recurrence interval whose next eruption imminent. We aim to resolve the accretion mechanism of binary system governing mass transfer during its super-active phase. Using phase-resolved high-resolution spectroscopy, we analyze zoo spectral-line profiles arising from activity. perform Doppler tomography selected emission lines system's gaseous components and their different velocity regimes. find evidence enhanced through...
Context. Asymptotic giant branch (AGB) stars enrich the interstellar medium through their mass loss. The mechanism(s) shaping circumstellar environment of mass-losing is not clearly understood so far. Aims. Our purpose to study effect binary companions located within first 10 stellar radii from primary AGB star. In this work, we target carbon star V Hydrae (V Hya) and search for signatures its companion in dust-forming region atmosphere. Methods. was observed L N bands with VLTI/MATISSE...
Context. Representative samples of F-, G-, K-type stars located outside the solar neighbourhood have started to become available in spectroscopic surveys. The fraction metal-poor ([Fe/H] ≲ −0.8 dex) giants becomes increasingly relevant towards greater distances. In stars, effective temperatures ( T eff ) based on local thermodynamic equilibrium (LTE) spectroscopy and former colour– relations – which are still widely used been reported be inaccurate. It is necessary recalibrate chemical...
The well studied carbon star V Hydrae is known to exhibit a complex asymmetric environment made of dense equatorial wind and high-velocity outflows, hinting at its transition from the AGB phase planetary nebula phase. In addition, also exhibits long secondary period 17 years in light curve, suggesting presence binary companion that could shape circumstellar environment. this paper, we aim confirm nature by deriving orbital parameters investigating effect motion on circumbinary first step,...
Our purpose is to study the effect of binary companions located within first 10 stellar radii from primary AGB star. In this work, we target mass-losing carbon star V Hydrae (V Hya), looking for signatures its companion in dust forming region atmosphere. The was observed L- and N-bands with VLTI/MATISSE instrument at low spectral resolution. We reconstructed images Hya's photosphere surroundings using two bands compared our interferometric observables VLTI/MIDI VISIR archival data. To...
Representative samples of F-, G-, K-type stars located out the Solar Neighbourhood has started to be available in spectroscopic surveys. The fraction metal-poor ([Fe/H]~$\lesssim -0.8$~dex) giants becomes increasingly relevant far distances. In stars, effective temperatures ($T_{\mathrm{eff}}$) based on LTE spectroscopy and former colour-$T_{\mathrm{eff}}$ relations still wide use have been reported inaccurate. It is necessary re-calibrate chemical abundances these $T_{\mathrm{eff}}$ scales...
Abstract A significant fraction of the stars near tip AGB phase become regular or semi-regular (Mira-type, SRs) pulsators. However, some these light curves have shown intriguing secondary minima sharp dips with much longer periods. Although this phenomenon shows resemblance R CrB variables, curve is generally symmetric before and after dip, whereas in luminosity recovers slower its minimum. More recently, high-resolution ALMA CO observations revealed a spiral structure around stars, which...