Search Publications
The Herschel/PACS view of disks around low-mass stars in Chamaleon-I
Pascucci, I.; Henning, Th.; Olofsson, J. +3 more
Context. Circumstellar disks are expected to be planet birthplaces. The potential for forming one or more planets of various masses is essentially driven by the initial mass of the disks, a crucial parameter for any planet formation theory. Constraining the masses of disks is of great interest for low-mass stars, which are expected to harbor less …
The shape of the cutoff in the synchrotron emission of SN 1006 observed with XMM-Newton
Miceli, M.; Bocchino, F.; Decourchelle, A. +3 more
Context. Synchrotron X-ray emission from the rims of young supernova remnants allows us to study the high-energy tail of the electrons accelerated at the shock front.
Aims: The analysis of X-ray spectra can provide information on the physical mechanisms that limit the energy achieved by the electrons in the acceleration process. We aim at ver…
Fueling the central engine of radio galaxies. II. The footprints of AGN feedback on the ISM of 3C 236
Morganti, R.; Combes, F.; García-Burillo, S. +7 more
Context. There is growing observational evidence of active galactic nuclei (AGN) feedback on the interstellar medium (ISM) of radio-quiet and radio-loud galaxies. While AGN feedback is expected to be more common at high-redshift objects, studying local universe galaxies helps to better characterize the different manifestations of AGN feedback.
A study on subarcsecond scales of the ammonia and continuum emission toward the G16.59-0.05 high-mass star-forming region
Sanna, A.; Pestalozzi, M.; Cesaroni, R. +4 more
Aims: We wish to investigate the structure, velocity field, and stellar content of the G16.59-0.05 high-mass star-forming region, where previous studies have established the presence of two almost perpendicular (NE-SW and SE-NW), massive outflows, and a rotating disk traced by methanol maser emission.
Methods: We performed Very Large Arr…
The fundamental parameters of the roAp star 10 Aquilae
Chesneau, O.; Goldfinger, P. J.; Sturmann, J. +12 more
Context. Owing to the strong magnetic field and related abnormal surface layers existing in rapidly oscillating Ap (roAp) stars, systematic errors are likely to be present when determining their effective temperatures, which potentially compromises asteroseismic studies of this class of pulsators.
Aims: Using the unique angular resolution pro…
HIFISTARS Herschel/HIFI observations of VY Canis Majoris. Molecular-line inventory of the envelope around the largest known star
Waters, L. B. F. M.; Menten, K. M.; Olofsson, H. +16 more
Aims: The study of the molecular gas in the circumstellar envelopes of evolved stars is normally undertaken by observing lines of CO (and other species) in the millimetre-wave domain. In general, the excitation requirements of the observed lines are low at these wavelengths, and therefore these observations predominantly probe the cold outer …
Origin of wide-band IP type II bursts
Valtonen, E.; Allawi, H.; Pohjolainen, S.
Context. Different types of interplanetary (IP) type II bursts have been observed, where the more usual ones show narrow-band and patchy emissions, sometimes with harmonics, and which at intervals may disappear completely from the dynamic spectrum. The more unusual bursts are wide-band and diffuse, show no patches or breaks or harmonic emission, a…
Regular frequency patterns in the young δ Scuti star HD 261711 observed by the CoRoT and MOST satellites
Auvergne, M.; Chaintreuil, S.; Ryabchikova, T. +14 more
Context. The internal structure of pre-main-sequence (PMS) stars is poorly constrained at present. This could change significantly through high-quality asteroseismological observations of a sample of such stars.
Aims: We concentrate on an asteroseismological study of HD 261711, a rather hot δ Scuti-type pulsating member of the young open clus…
Is the bowshock of the runaway massive star HD 195592 a Fermi source?
De Becker, M.; Romero, G. E.; del Valle, M. V.
Context. HD 195592 is an O-type super-giant star, known as a well-established runaway. Recently, a Fermi γ-ray source (2FGL J2030.7+4417) with a position compatible with that of HD 195592 has been reported.
Aims: Our goal is to explore the scenario where HD 195592 is the counterpart of the Fermi γ-ray source, modeling the non-thermal emission…
Pushing the limits of the Gaia space mission by analyzing galaxy morphology
Ducourant, C.; Gavras, P.; Galluccio, L. +6 more
Context. The ESA Gaia mission, to be launched during 2013, will observe billions of objects, among which many galaxies, during its 5 yr scanning of the sky. This will provide a large space-based dataset with unprecedented spatial resolution.
Aims: Because of its natural Galactic and astrometric priority, Gaia's observational strategy was opti…