Search Publications
Stellar population gradients at cosmic noon as a constraint to the evolution of passive galaxies
Andreon, S.; Ditrani, F. R.; Longhetti, M. +1 more
Context. The radial variations of the stellar populations properties within passive galaxies at high redshift contain information about their assembly mechanisms, based on which galaxy formation and evolution scenarios may be distinguished.
Aims: The aim of this work is to give constraints on massive galaxy formation scenarios through one of …
X-ray pulsar HD 49798: a contracting white dwarf with a debris disk?
Chen, Wen-Cong
HD 49798/RX J0648.0C4418 is a peculiar binary including a hot subdwarf of O spectral type and a compact companion in a 1.55 day orbit. Based on the steady spin period derivative Ṗ = (−2.17 ± 0.01) × 10−15 s s−1 , the compact object was thought to be a contracting young white dwarf (WD). However, the X-ray luminosity produced …
V1294 Aql = HD 184279: A bad boy among Be stars or an important clue to the Be phenomenon?
Wolf, M.; Chini, R.; Harmanec, P. +21 more
A reliable determination of the basic physical properties and variability patterns of hot emission-line stars is important for understanding the Be phenomenon and ultimately, the evolutionary stage of Be stars. This study is devoted to one of the most remarkable Be stars, V1294 Aql = HD 184279. We collected and analysed spectroscopic and photometr…
Evolved eclipsing binary systems in the Galactic bulge: Precise physical and orbital parameters of OGLE-BLG-ECL-305487 and OGLE-BLG-ECL-116218
Smolec, R.; Thompson, I. B.; Villanova, S. +17 more
Aims: Our goal is to determine, with high accuracy, the physical and orbital parameters of two double-lined eclipsing binary systems, where the components are two giant stars. We also aim to study the evolutionary status of the binaries, to derive the distances towards them by using a surface brightness-colour relation, and to compare these m…
CORALIE radial velocity search for companions around evolved stars (CASCADES). II. Seismic masses for three red giants orbited by long-period massive planets
Buldgen, G.; Eggenberger, P.; Ségransan, D. +10 more
Context. The advent of asteroseismology as the golden path to precisely characterize single stars naturally led to synergies with the field of exoplanetology. Today, the precise determination of stellar masses, radii and ages for exoplanet-host stars is a driving force in the development of dedicated software and techniques to achieve this goal. H…
Hot magnetic halo of NGC 628 (M 74)
Ehle, M.; Weżgowiec, M.; Soida, M. +4 more
Context. In several spiral galaxies that are observed face-on, large-scale ordered magnetic fields (the so-called magnetic arms) were found. One of the explanations was the action of the magnetic reconnection, which leads to a higher ordering of the magnetic fields. Because it simultaneously converts the energy of the magnetic fields into thermal …
Towards a consistent model of the hot quadruple system HD 93206 = QZ Carinæ. I. Observations and their initial analyses
Wolf, M.; Chini, R.; Harmanec, P. +18 more
The hot nine-component system HD 93206, which contains a gravitationally bounded eclipsing Ac1+Ac2 binary (P = 5.9987 d) and a spectroscopic Aa1+Aa2 (P = 20.734 d) binary can provide important insights into the origin and evolution of massive stars. Using archival and new spectra, and a rich collection of ground-based and space photometric observa…
KIC 6951642: A confirmed Kepler γ Doradus - δ Scuti star with intermediate to fast rotation in a possible single-lined binary system
Gizon, L.; Lampens, P.; Samadi-Ghadim, A.
Context. KIC 6951642 has been reported as a candidate hybrid pulsator of type-γ Doradus - δ Scuti from observations of the first quarters of the Kepler mission. The regular patterns seen in the Fourier spectra of the Kepler and Transiting Exoplanet Survey Satellite TESS light curves and the sinusoidal modulation of its surface brightness suggest t…
J-PLUS: Discovery and characterisation of ultracool dwarfs using Virtual Observatory tools. II. Second data release and machine learning methodology
Hernández-Monteagudo, C.; Caballero, J. A.; Martín, E. L. +20 more
Context. Ultracool dwarfs (UCDs) comprise the lowest mass members of the stellar population and brown dwarfs, from M7 V to cooler objects with L, T, and Y spectral types. Most of them have been discovered using wide-field imaging surveys, for which the Virtual Observatory (VO) has proven to be of great utility.
Aims: We aim to perform a searc…
Ram pressure stripping in the z ∼ 0.5 galaxy cluster MS 0451.6-0305
Durret, F.; Ebeling, H.; Jauzac, M. +3 more
Context. The pressure exerted by the ambient hot X-ray gas on cluster galaxies can lead to the presence of ram pressure stripped (RPS) galaxies, characterized by asymmetric shapes, and, in some cases, tails of blue stars and/or X-ray gas, with increased star formation.
Aims: With the aim of increasing the known sample of RPS galaxies at redsh…