Search Publications
A deep XMM-Newton look on the thermally emitting isolated neutron star RX J1605.3+3249
Haberl, F.; Motch, C.; Zane, S. +3 more
Previous XMM-Newton observations of the thermally emitting isolated neutron star RX J1605.3+3249 provided a candidate for a shallow periodic signal and evidence of a fast spin down, which suggested a high dipolar magnetic field and an evolution from a magnetar. We obtained a large programme with XMM-Newton to confirm its candidate timing solution,…
Measuring the filamentary structure of interstellar clouds through wavelets
Ossenkopf-Okada, V.; Stepanov, R.
Context. The ubiquitous presence of filamentary structures in the interstellar medium asks for an unbiased characterization of their properties including a stability analysis.
Aims: We propose a novel technique to measure the spectrum of filaments in any two-dimensional data set. By comparing the power in isotropic and anisotropic structures …
Spectroscopic membership for the populous 300 Myr-old open cluster NGC 3532
Strassmeier, K. G.; Barnes, S. A.; James, D. J. +3 more
Context. NGC 3532 is an extremely rich open cluster embedded in the Galactic disc, hitherto lacking a comprehensive, documented membership list.
Aims: We provide membership probabilities from new radial velocity observations of solar-type and low-mass stars in NGC 3532, in part as a prelude to a subsequent study of stellar rotation in the clu…
Discovery of weak magnetic fields in four DZ white dwarfs in the local 20 pc volume. Implications for the frequency of magnetic fields with cooling age
Bagnulo, S.; Landstreet, J. D.
We report the discovery of weak magnetic fields in three white dwarfs within the local 20 pc volume (WD 0816-310, WD 1009-184, and WD 1532+129), and we confirm the magnetic nature of a fourth star (WD 2138-332) in which we had previously detected a field at a 3σ level. The spectra of all these white dwarfs are characterised by the presence of meta…
The EBLM project. VI. Mass and radius of five low-mass stars in F+M binaries discovered by the WASP survey
Bouchy, F.; Queloz, D.; Ségransan, D. +26 more
Some M-dwarfs around F-/G-type stars have been measured to be hotter and larger than predicted by stellar evolution models. Inconsistencies between observations and models need to be addressed with more mass, radius, and luminosity measurements of low-mass stars to test and refine evolutionary models. Our aim is to measure the masses, radii and ag…
Exposing the plural nature of molecular clouds. Extracting filaments and the cosmic infrared background against the true scale-free interstellar medium
Schneider, N.; Bontemps, S.; Elia, D. +2 more
We present the Multiscale non-Gaussian Segmentation (MnGSeg) analysis technique. This wavelet-based method combines the analysis of the probability distribution function (PDF) of map fluctuations as a function of spatial scales and the power spectrum analysis of a map. This technique allows us to extract the non-Gaussianities identified in the mul…
Asteroseismology of the Hyades red giant and planet host ɛ Tauri
Christensen-Dalsgaard, J.; Andersen, M. F.; Grundahl, F. +23 more
Context. Asteroseismic analysis of solar-like stars allows us to determine physical parameters such as stellar mass, with a higher precision compared to most other methods. Even in a well-studied cluster such as the Hyades, the masses of the red giant stars are not well known, and previous mass estimates are based on model calculations (isochrones…
Semi-empirical model atmospheres for the chromosphere of the sunspot penumbra and umbral flashes
Rouppe van der Voort, Luc; Henriques, Vasco M. J.; Bose, Souvik +1 more
Context. The solar chromosphere and the lower transition region are believed to play a crucial role in the heating of the solar corona. Models that describe the chromosphere (and the lower transition region), accounting for its highly dynamic and structured character are, so far, found to be lacking. This is partly due to the breakdown of complete…
From solar to stellar flare characteristics. On a new peak size distribution for G-, K-, and M-dwarf star flares
Heber, Bernd; Papaioannou, Athanasios; Herbst, Konstantin +1 more
Context. The connection between solar energetic proton events and X-ray flares has been the focus of many studies over the past 13 yr. In the course of these investigations several peak size distribution functions based on Geostationary Operational Environmental Satellite (GOES) measurements of both quantities have been developed. In more recent s…
Indications of non-conservative mass transfer in AMXPs
Sanna, A.; Papitto, A.; Di Salvo, T. +7 more
Context. Since the discovery of the first accreting millisecond X-ray pulsar (AMXP) SAX J1808.4-3658 in 1998, the family of these sources has kept growing. Currently, it has 22 members. All AMXPs are transients with usually very long quiescence periods, implying that the mass accretion rate in these systems is quite low and not constant. Moreover,…