Search Publications
Mid-infrared interferometry towards the massive young stellar object CRL 2136: inside the dust rim
Lumsden, S. L.; Hoare, M. G.; de Wit, W. J. +3 more
Context. Establishing the importance of circumstellar disks and their properties is crucial to fully understand massive star formation.
Aims: We aim to spatially resolve the various components that make-up the accretion environment of a massive young stellar object (⪉100 AU), and reproduce the emission from near-infrared to millimeter wavelen…
A disc inside the bipolar planetary nebula M2-9
Smith, N.; Balick, B.; Lykou, F. +4 more
Aims: Bipolarity in proto-planetary and planetary nebulae is associated with events occurring in or around their cores. Past infrared observations have revealed the presence of dusty structures around the cores, many in the form of discs. Characterising those dusty discs provides invaluable constraints on the physical processes that govern th…
The merging cluster Abell 1758 revisited: multi-wavelength observations and numerical simulations
Durret, F.; Laganá, T. F.; Haider, M.
Context. Cluster properties can be more distinctly studied in pairs of clusters, where we expect the effects of interactions to be strong.
Aims: We here discuss the properties of the double cluster Abell 1758 at a redshift z ~ 0.279. These clusters show strong evidence for merging.
Methods: We analyse the optical properties of the North …
A solar eruption triggered by the interaction between two magnetic flux systems with opposite magnetic helicity
Romano, P.; Pariat, E.; Zuccarello, F. +1 more
Context. In recent years the accumulation of magnetic helicity via emergence of new magnetic flux and/or shearing photospheric motions has been considered to play an important role in the destabilization processes that lead to eruptive phenomena occurring in the solar atmosphere.
Aims: In this paper we want to highlight a specific aspect of m…
The evolution of M 2-9 from 2000 to 2010
Balick, B.; Corradi, R. L. M.; Santander-García, M.
Context. Understanding the formation of collimated outflows is one of the most debated and controversial topics in the study of the late stages of stellar evolution.
Aims:
The 2XMMi/SDSS Galaxy Cluster Survey. I. The first cluster sample and X-ray luminosity-temperature relation
Takey, A.; Schwope, A.; Lamer, G.
We present a catalogue of X-ray selected galaxy clusters and groups as a first release of the 2XMMi/SDSS Galaxy Cluster Survey. The survey is a search for galaxy clusters detected serendipitously in observations with XMM-Newton in the footprint of the Sloan Digital Sky Survey (SDSS). The main aims of the survey are to identify new X-ray galaxy clu…
Water in low-mass star-forming regions with Herschel (WISH-LM). High-velocity H2O bullets in L1448-MM observed with HIFI
Liseau, R.; van Dishoeck, E. F.; Bachiller, R. +4 more
Herschel-HIFI observations of water in the low-mass star-forming object L1448-MM, known for its prominent outflow, are presented, as obtained within the "Water in star-forming regions with Herschel" (WISH) key programme. Six H216O lines are targeted and detected (Eup/kB ~ 50-250 K), as is CO J = 10-9 (E<…
The magnitude difference between the main sequence turn off and the red giant branch bump in Galactic globular clusters
Salaris, M.; Pietrinferni, A.; Monelli, M. +3 more
We present new measurements of the magnitude of the main sequence turn off and the red giant branch bump in the luminosity function of a sample of Galactic globular clusters with updated estimates of [Fe/H] and [α/Fe], employing photometric data collected with the Advanced Camera for Survey onboard the HST. We compare measured and predicted values…
A chemical inventory of the S-type AGB star χ Cygni based on Herschel/HIFI observations of circumstellar line emission. The importance of non-LTE chemical processes in a dynamical region
Olofsson, H.; Justtanont, K.; de Koter, A. +5 more
Context. S-type AGB stars (C/O ≈ 1) are thought to be transition objects from M-type (O-rich) AGB stars to carbon stars and as such are interesting objects in themselves. Of particular interest is to determine accurate circumstellar properties and molecular abundances, due to their predicted sensitivity to the photospheric C/O-ratio.
Aims: Pr…
The debris disk host star HD 61005: a member of the Argus association?
Alcalá, J. M.; Lanzafame, A. C.; Brugaletta, E. +6 more
Context. HD 61005 is a nearby young solar type star that shows a large infrared excess due to a debris disk. The disk has been recently imaged from ground and space, with indications of several components. Some characteristics of the disk suggest the presence of planetary companions around the star, that remain undetected in deep adaptive optics i…