Search Publications
Probing the initial conditions of high-mass star formation. III. Fragmentation and triggered star formation
Zhang, Chuan-Peng; Li, Guang-Xing; Wyrowski, Friedrich +6 more
Context. Fragmentation and feedback are two important processes during the early phases of star formation.
Aims: Massive clumps tend to fragment into clusters of cores and condensations, some of which form high-mass stars. In this work, we study the structure of massive clumps at different scales, analyze the fragmentation process, and invest…
Herschel-HOBYS study of the earliest phases of high-mass star formation in NGC 6357
White, G. J.; Könyves, V.; Rygl, K. L. J. +19 more
Aims: To constrain models of high-mass star formation it is important to identify the massive dense cores (MDCs) that are able to form high-mass star(s). This is one of the purposes of the Herschel/HOBYS key programme. Here, we carry out the census and characterise of the properties of the MDCs population of the NGC 6357 H II region.
Met…
The optical and NIR spectrum of the Crab pulsar with X-shooter
Sollerman, J.; Lundqvist, P.; Vreeswijk, P. M. +2 more
Context. Pulsars are well studied all over the electromagnetic spectrum, and the Crab pulsar may be the most studied object in the sky. Nevertheless, a high-quality optical to near-infrared (NIR) spectrum of the Crab or any other pulsar has not been published to date.
Aims: Obtaining a properly flux-calibrated spectrum enables us to measure t…
Constraints on HD 113337 fundamental parameters and planetary system. Combining long-base visible interferometry, disc imaging, and high-contrast imaging
Henning, T.; Meunier, N.; Lagrange, A. -M. +14 more
Context. HD 113337 is a main-sequence F6V field star more massive than the Sun. This star hosts one confirmed giant planet and possibly a second candidate, detected by radial velocities (RVs). The star also hosts a cold debris disc detected through the presence of an infrared excess, making it an interesting system to explore.
Aims: We aim to…
The origin of very massive stars around NGC 3603
Vink, J. S.; de Wit, W. J.; Méndez, R. A. +2 more
The formation mechanism of the most massive stars in the Universe remains an unsolved problem. Are they able to form in relative isolation in a manner similar to the formation of solar-type stars, or do they necessarily require a clustered environment? In order to shed light on this important question, we study the origin of two very massive stars…
Flares of accretion activity of the 20 Myr old UXOR RZ Psc
Grinin, V. P.; Potravnov, I. S.; Serebriakova, N. A.
We discuss a revision of accretion activity and kinematics of the enigmatic isolated UX Ori type star RZ Psc. Previously, RZ Psc was known to possess only spectroscopic signatures of outflow in the low-excitation lines of alkali metals. The archival high-resolution spectra reveal a short-lived episode of magnetospheric accretion in the system obse…
Gaia 8: Discovery of a star cluster containing β Lyrae
Bastian, U.
Aims: The aim here is to try and clarify whether there are stars in the neighbourhood of β Lyrae which are physically connected to the famous prototype eclipsing binary.
Methods: We scrutinised the astrometric and photometric data (from HIPPARCOS and Gaia DR2) of stars in a limited sky field around β Lyrae.
Results: A star cluster o…
The OTELO survey. III. Demography, morphology, IR luminosity and environment of AGN hosts
Gallego, Jesús; Sánchez-Portal, Miguel; Pintos-Castro, Irene +16 more
Aims: We take advantage of the capabilities of the OSIRIS Tunable Emission Line Object (OTELO) survey to select and study the AGN population in the field. In particular, we aim to perform an analysis of the properties of these objects, including their demography, morphology, and IR luminosity. Focusing on the population of Hα emitters at z ∼ …
Flattened loose particles from numerical simulations compared to particles collected by Rosetta
Lasue, J.; Bentley, M. S.; Merouane, S. +5 more
Context. Cometary dust particles are remnants of the primordial accretion of refractory material that occurred during the initial formation stages of the solar system. Understanding their physical structure can help constrain their accretion process.
Aims: The in situ study of dust particles that were collected at slow speeds by instruments o…
A population of high-velocity absorption-line systems residing in the Local Group
Fechner, C.; Richter, P.; Bouma, S. J. D.
Aims: We investigated the ionisation conditions and distances of Galactic high-velocity clouds (HVCs) in the Galactic halo and beyond in the direction of the Local Group (LG) barycentre and anti-barycentre, by studying spectral data of 29 extragalactic background sources obtained with the Cosmic Origins Spectropgraph (COS) installed on the Hu…