Search Publications
Refractory elements in the gas phase for comet 67P/Churyumov-Gerasimenko. Possible release of atomic Na, Si, and Fe from nanograins
De Keyser, Johan; Gombosi, Tamas I.; Berthelier, Jean-Jacques +10 more
Context. Gas-phase sodium, silicon, potassium, and calcium were previously identified in mass spectra recorded in the coma of comet 67P/Churyumov-Gerasimenko, the target of the European Space Agency's Rosetta mission. The major release process for these atoms was identified as sputtering by the solar wind. More recently, remote observations of num…
J1832.4-1627, the first eclipsing stream-fed intermediate polar
Beuermann, K.; Breitenstein, P.; Schwab, E.
We present a photometric study of the newly discovered eclipsing intermediate polar
Spherical harmonic decomposition and interpretation of the shapes of the small Saturnian inner moons
Lainey, V.; Rambaux, N.; Cooper, N. +2 more
Context. The Cassini-Huygens space mission made a series of observations of Saturn's small satellites during its grand finale stage. These measurements were performed in order to study the shape, geology, and surface composition of the small satellites as well as to study the impact of the environment, in particular the rings, on these small bodie…
SRG/ART-XC, Swift, NICER, and NuSTAR study of different states of the transient X-ray pulsar MAXI J0903-531
Wilms, Jörn; Doroshenko, Victor; Tsygankov, Sergey S. +6 more
The results of the broadband spectral and timing study of the recently discovered transient X-ray pulsar MAXI J0903-531 in a wide range of luminosities that differ by a factor of ~30 are reported. The observed X-ray spectrum in both states can be described as a classical pulsar-like spectrum consisting of a power law with a high-energy cutoff. We …
Tracking of magnetic helicity evolution in the inner heliosphere. A radial alignment study
Richter, I.; Narita, Y.; Hadid, L. Z. +5 more
Context. Magnetic helicity is one of the invariants in ideal magnetohydrodynamics, and its spectral evolution has a substantial amount of information to reveal the mechanism that are behind turbulence in space and astrophysical plasmas.
Aims: The goal of our study is to observationally characterize the magnetic helicity evolution in the inner…
Disentangling emission from star-forming regions in the Magellanic Clouds: Linking [O III]λ88 µm and 24 µm
Ramambason, L.; Lebouteiller, V.; Madden, S. C. +5 more
Context. The [O III]λ88 µm line is observed in many galaxies including our neighboring Magellanic Clouds and is a well-known tracer of H II regions, while the 24 µm continuum emission has often been used to trace warm dust in the ionized phases of galaxies. The association of both the [O III]λ88 µm line and 24 µm in galaxies to star formation moti…
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…