Search Publications
A spatial study of the mid-IR emission features in four Herbig Ae/Be stars
Waters, L. B. F. M.; Tielens, A. G. G. M.; Boersma, C. +5 more
Context: Infrared (IR) spectroscopy and imaging provide a prime tool to study the characteristics of polycyclic aromatic hydrocarbon (PAH) molecules and the mineralogy in regions of star formation. Herbig Ae/Be stars are known to have varying amounts of natal cloud material present in their vicinity.
Aims: Our aim is to study the characteristi…
The flared inner disk of the Herbig Ae star AB Aurigae revealed by VLTI/MIDI in the N-band
Wolf, S.; Lopez, B.; Leinert, Ch. +4 more
Aims: We aim at using the long baselines of the VLT Interferometer and the mid-IR combiner MIDI (8-13 µm) to derive the morphology of the protoplanetary disk surrounding the Herbig Ae star AB Aurigae
Methods: We present the first N-band analysis of AB Aur performed with a maximum angular resolution of 17 mas (2.5 AU at the Taurus-Auriga …
Long tails on thermonuclear X-ray bursts from neutron stars: a signature of inward heating?
Homan, J.; in't Zand, J. J. M.; Méndez, M. +3 more
We report the discovery of one-hour long tails on the few-minutes long X-ray bursts from the “clocked burster” GS 1826-24. We propose that the tails are due to enduring thermal radiation from the neutron star envelope. The enduring emission can be explained by cooling of deeper neutron star layers that were heated up through inward conduction of h…
Detection of X-rays from the jet-driving symbiotic star MWC 560
Stute, M.; Sahai, R.
Aims: We report the detection of X-ray emission from the jet-driving symbiotic star MWC 560.
Methods: We observed MWC 560 with XMM-Newton for 36 ks. We fitted the spectra from the EPIC pn, MOS1 and MOS2 instruments with XSPEC and examined the light curves with the package XRONOS.
Results: The spectrum can be fitted with a highly absorbed h…
Modeling the X-ray emission of SN 1993J
Fransson, C.; Nymark, T. K.; Chandra, P.
Aims: We investigate the effects of radiative shocks on the observed X-ray emission from the type II supernova SN 1993J. To this end, the X-ray emission is modeled as a result of the interaction between the supernova ejecta and a dense circumstellar medium at an age of 8 years.
Methods: The circumstances under which the reverse shock is radiat…
The role of environment in the morphological transformation of galaxies in 9 rich intermediate redshift clusters
Pelló, R.; Huertas-Company, M.; Soucail, G. +1 more
Context: Rich clusters offer a unique laboratory for studying the effects of local environment on the morphological transformation of galaxies moving from the blue star-forming cloud to the red passive sequence. Due to the high-density, any environmental process should be more pronounced there compared to the field population.
Aims: Ideally, w…
Gamma-rays from the vicinity of accreting neutron stars inside compact high-mass X-ray binaries
Bednarek, W.
The dense wind of a massive star can be captured partially by a neutron star (NS) inside a compact binary system. Depending on the parameters of the NS and the wind, the matter can penetrate the inner NS magnetosphere. At some distance from the NS, a turbulent and magnetized transition region is formed due to the balance between the magnetic press…
Solar source of energetic particles in interplanetary space during the 2006 December 13 event
Vial, J. -C.; Fazakerley, A. N.; Owen, C. J. +5 more
An X3.4 solar flare and a fast halo coronal mass ejection (CME) occurred on 2006 December 13, accompanied by a high flux of energetic particles recorded both in near-Earth space and at ground level. Our purpose is to provide evidence of flare acceleration in a major solar energetic particle (SEP) event. We first present observations from ACE/EPAM,…
An ISO/SWS study of the dust composition around S stars. A novel view of S-star dust
Heras, A. M.; Hony, S.; Molster, F. J. +1 more
Aims: We investigate the composition of the solid-state materials in the winds around S-type AGB stars. The S stars produce dust in their wind that bears a resemblance to the dust produced in some O-rich AGB stars. However, the reported resemblance is mostly based on IRAS/LRS spectra with limited spectral resolution, sensitivity, and wavelength co…
Properties of the ionised plasma in the vicinity of the neutron-star X-ray binary EXO 0748-676
Costantini, E.; Méndez, M.; Paerels, F. B. S. +2 more
Aims: We present the spectral analysis of a large set of XMM-Newton observations of EXO 0748-676, a bright dipping low-mass X-ray binary. In particular, we focus on the dipping phenomenon as a result of changes in the properties of the ionised gas close to the source.
Methods: We analysed the high-resolution spectra collected with the reflecti…