Search Publications
The applicability of far-infrared fine-structure lines as star formation rate tracers over wide ranges of metallicities and galaxy types
Lebouteiller, Vianney; De Looze, Ilse; Baes, Maarten +19 more
Aims: We analyze the applicability of far-infrared fine-structure lines [Cii] 158 µm, [Oi] 63 µm, and [Oiii] 88 µm to reliably trace the star formation rate (SFR) in a sample of low-metallicity dwarf galaxies from the Herschel Dwarf Galaxy Survey and, furthermore, extend the analysis to a broad sample of galaxies of various …
Dust spectral energy distributions of nearby galaxies: an insight from the Herschel Reference Survey
Ciesla, L.; Buat, V.; Boquien, M. +20 more
Although it accounts only for a small fraction of the baryonic mass, dust has a profound impact on the physical processes at play in galaxies. Thus, to understand the evolution of galaxies, it is essential not only to characterize dust properties per se, but also in relation to global galaxy properties. To do so, we derive the dust properties of g…
A hidden reservoir of Fe/FeS in interstellar silicates?
Ysard, N.; Jones, A.; Köhler, M.
Context. The depletion of iron and sulphur into dust in the interstellar medium and the exact nature of interstellar amorphous silicate grains is still an open question.
Aims: We study the incorporation of iron and sulphur into amorphous silicates of olivine- and pyroxene-types and their effects on the dust spectroscopy and thermal emission. …
Gas lines from the 5-Myr old optically thin disk around HD 141569A . Herschel observations and modeling
Pinte, C.; Ménard, F.; Woitke, P. +20 more
Context. The gas- and dust dissipation processes in disks around young stars remain uncertain despite numerous studies. At the distance of ~99-116 pc, HD 141569A is one of the nearest HerbigAe stars that is surrounded by a tenuous disk, probably in transition between a massive primordial disk and a debris disk. Atomic and molecular gases have been…
Resolving HD 100546 disc in the mid-infrared: Small inner disc and asymmetry near the gap
Jaffe, W.; Dominik, C.; Henning, Th. +5 more
Context. A region of roughly half of the solar system scale around the star HD 100546 is known to be largely cleared of gas and dust, in contrast to the outer disc that extends to about 400 AU. However, some material is observed in the immediate vicinity of the star, called the inner disc. Studying the structure of the inner and the outer disc is …
Detailed modelling of the circumstellar molecular line emission of the S-type AGB star W Aquilae
Olofsson, H.; Justtanont, K.; Lombaert, R. +5 more
Context. S-type AGB stars have a C/O ratio which suggests that they are transition objects between oxygen-rich M-type stars and carbon-rich C-type stars. As such, their circumstellar compositions of gas and dust are thought to be sensitive to their precise C/O ratio, and it is therefore of particular interest to examine their circumstellar propert…
The wind of W Hydrae as seen by Herschel. II. The molecular envelope of W Hydrae
Waters, L. B. F. M.; Menten, K. M.; Blommaert, J. A. D. L. +18 more
Context. The evolution of low- and intermediate-mass stars on the asymptotic giant branch (AGB) is mainly controlled by the rate at which these stars lose mass in a stellar wind. Understanding the driving mechanism and strength of the stellar winds of AGB stars and the processes enriching their surfaces with products of nucleosynthesis are paramou…
An interferometric study of the post-AGB binary 89 Herculis. II. Radiative transfer models of the circumbinary disk
Regibo, S.; Wevers, T.; Verhoelst, T. +6 more
Context. The presence of stable disks around post-asymptotic giant branch (post-AGB) binaries is a widespread phenomenon. Also, the presence of (molecular) outflows is now commonly inferred in these systems.
Aims: In the first paper of this series, a surprisingly large fraction of optical light was found to be resolved in the 89 Her post-AGB …
The Herschel Planetary Nebula Survey (HerPlaNS). I. Data overview and analysis demonstration with NGC 6781
Nordon, R.; Sahai, R.; Behar, E. +30 more
Context. This is the first of a series of investigations into far-IR characteristics of 11 planetary nebulae (PNe) under the Herschel Space Observatory open time 1 program, Herschel Planetary Nebula Survey (HerPlaNS).
Aims: Using the HerPlaNS data set, we look into the PN energetics and variations of the physical conditions within the target …
Herschel/PACS observations of the 69 µm band of crystalline olivine around evolved stars
Waters, L. B. F. M.; Blommaert, J. A. D. L.; García-Lario, P. +15 more
Context. We present 48 Herschel/PACS spectra of evolved stars in the wavelength range of 67-72 µm. This wavelength range covers the 69 µm band of crystalline olivine (Mg2-2xFe(2x)SiO4). The width and wavelength position of this band are sensitive to the temperature and composition of the crystalline oli…