Search Publications
The nature of the companion in the Wolf-Rayet system EZ Canis Majoris
Schmutz, W.; Koenigsberger, G.
Context. EZ Canis Majoris is a classical Wolf-Rayet star whose binary nature has been debated for decades. It was recently modeled as an eccentric binary with a periodic brightening at periastron of the emission originating in a shock heated zone near the companion.
Aims: The focus of this paper is to further test the binary model and to cons…
Mirror, mirror on the outflow cavity wall. Near-infrared CO overtone disc emission of the high-mass YSO IRAS 11101-5829
Stecklum, B.; Coffey, D.; Natta, A. +7 more
Aims: The inner regions of high-mass protostars are often invisible in the near-infrared, obscured by thick envelopes and discs. We aim to investigate the inner gaseous disc of IRAS 11101-5829 through scattered light from the outflow cavity walls.
Methods: We observed the immediate environment of the high-mass young stellar object IRAS 1…
Differential rotation of the solar corona: A new data-adaptive multiwavelength approach
Giordano, S.; Mancuso, S.; Telloni, D. +1 more
Context. The characterization of the differential rotation of the extended corona is still lacking conclusive results about the actual rotation rate profiles, and it is also expected to vary along the solar cycle. While some studies supported the quasi-rigidity of coronal rotation, others have found evidence of differential rotation to occur.
…
Skymaps of observables of three-dimensional magnetohydrodynamic astrosphere models
Weis, K.; Bomans, D. J.; Fichtner, H. +3 more
Context. Three-dimensional models of astrospheres have recently become of interest. However, comparisons between these models and observations are non-trivial because of the two-dimensional nature of observations.
Aims: By projecting selected physical values of three-dimensional models of astrospheres onto the surface of a sphere that is cent…
The GAPS programme at TNG. XXIII. HD 164922 d: close-in super-Earth discovered with HARPS-N in a system with a long-period Saturn mass companion
Scandariato, G.; Pagano, I.; Marzari, F. +41 more
Context. Observations of exoplanetary systems demonstrate that a wide variety of planetary architectures are possible. Determining the rate of occurrence of Solar System analogues - with inner terrestrial planets and outer gas giants - remains an open question.
Aims: Within the framework of the Global Architecture of Planetary Systems (GAPS) …
Discovery of a complex spiral-shell structure around the oxygen-rich AGB star GX Monocerotis
Wittkowski, M.; Kim, H.; Randall, S. K. +4 more
The circumstellar envelopes of asymptotic giant branch (AGB) stars exhibit a wide range of morphologies and chemical compositions that can be exploited to unravel their mass-loss history as well as binary status. Here, we present ALMA Band 6 observations centred upon the oxygen-rich, high mass-loss rate AGB star GX Mon. The resulting CO (2-1) map …
The residence-time of Jovian electrons in the inner heliosphere
Heber, B.; Herbst, K.; Vogt, A. +3 more
Context. Jovian electrons serve an important role in test-particle distribution in the inner heliosphere. They have been used extensively in the past to study the (diffusive) transport of cosmic rays in the inner heliosphere. With new limits on the Jovian source function, that is, the particle intensity just outside the Jovian magnetosphere, and a…
V363 Cassiopeiae: a new lithium-rich Galactic Cepheid
Clementini, G.; Ripepi, V.; Molinaro, R. +8 more
Context. Classical Cepheids (DCEPs) are important astrophysical objects not only as standard candles in the determination of the cosmic distance ladder, but also as a testbed for the stellar evolution theory. This is based on the strict connection between their pulsation (period(s) and amplitudes) and stellar parameters (luminosity, mass, effectiv…
Modelling hystereses observed during dwarf nova outbursts
Knigge, C.; Hameury, J. -M.; Lasota, J. -P. +2 more
Context. Although the disc instability model is widely accepted as the explanation for dwarf nova outbursts, it is still necessary to compare its predictions to observations because many of the constraints on angular momentum transport in accretion discs are derived from the application of this model to real systems.
Aims: We test the predict…
The galaxy population within the virial radius of the Perseus cluster
Apai, D.; Stecklum, B.; Meusinger, H. +3 more
Context. The Perseus cluster is one of the most massive nearby galaxy clusters and is fascinating in various respects. Though the galaxies in the central cluster region have been intensively investigated, an analysis of the galaxy population in a larger field is still outstanding.
Aims: This paper investigates the galaxies that are brighter t…