Search Publications
Spectral and timing properties of the accreting X-ray millisecond pulsar IGR J17511-3057
Stella, L.; Bozzo, E.; Kuiper, L. +6 more
Context. IGR J17511-3057 is the second X-ray transient accreting millisecond pulsar discovered by INTEGRAL. It was in outburst for about a month beginning on September 13, 2009.
Aims: We analyze the spectral and timing properties of the object and the characteristics of X-ray bursts with the aim to constrain the physical processes responsible…
Horizontal flow fields observed in Hinode G-band images. I. Methods
Verma, M.; Denker, C.
Context. The interaction of plasma motions and magnetic fields is an important mechanism, which drives the solar activity in all its facets. For example, photospheric flows are responsible for the advection of magnetic flux, the redistribution of flux during the decay of sunspots, and the build-up of magnetic shear in flaring active regions.
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HIFI detection of hydrogen fluoride in the carbon star envelope IRC +10216
Waters, L. B. F. M.; Teyssier, D.; Cernicharo, J. +5 more
We report the detection of emission in the J = 1-0 rotational transition of hydrogen fluoride (HF), together with observations of the J = 1-0 to J = 3-2 rotational lines of H35Cl and H37Cl, towards the envelope of the carbon star IRC +10216. High-sensitivity, high-spectral resolution observations have been carried out with th…
The X-ray puzzle of the L1551 IRS 5 jet
Schmitt, J. H. M. M.; Günther, H. M.; Schneider, P. C.
Protostars are actively accreting matter and they drive spectacular, dynamic outflows, which evolve on timescales of years. X-ray emission from these jets has been detected only in a few cases and little is known about its time evolution. We present a new Chandra observation of L1551 IRS 5's jet in the context of all available X-ray data of this o…
High-energy radiation from the massive binary system Eta Carinae
Bednarek, W.; Pabich, J.
Context. The most massive binary system Eta Carinae has been recently established as a gamma-ray source by the AGILE and Fermi-LAT detectors. The high energy spectrum of this gamma-ray source is very intriguing. It shows two clear components and a lack of any evidence of variability with the orbital period of the binary system.
Aims: We consi…
Interpretation of HINODE SOT/SP asymmetric Stokes profiles observed in the quiet Sun network and internetwork
Sánchez Almeida, J.; Berrilli, F.; Del Moro, D. +1 more
Stokes profiles emerging from the magnetized solar photosphere and observed by SOT/SP aboard the HINODE satellite exhibit a variety of complex shapes. These are indicative of unresolved magnetic structures that have been overlooked in the inversion analyses performed so far. Here we present the first interpretation of the Stokes profile asymmetrie…
Imaging the circumstellar dust around AGB stars with PolCor
Olofsson, G.; Olofsson, H.; Schöier, F. L. +2 more
Aims: The aim of this paper is to investigate how the new imaging Polarimeter and Coronograph (PolCor) at the Nordic Optical Telescope (NOT) can be used in the study of circumstellar structures around AGB stars. The purpose is to prepare for a study of a larger sample.
Methods: We have observed two types of AGB stars using the PolCor ins…
Observing and modeling the dynamic atmosphere of the low mass-loss C-star R Sculptoris at high angular resolution
Höfner, S.; Verhoelst, T.; Hron, J. +4 more
Context. We study the circumstellar environment of the carbon-rich star R Sculptoris using the near- and mid-infrared high spatial resolution observations from the ESO-VLTI focal instruments VINCI and MIDI, respectively.
Aims: These observations aim at increasing our knowledge of the dynamic processes in play within the very close circumstell…
Hinode/EIS plasma diagnostics in the flaring solar chromosphere
Fletcher, L.; Hannah, I. G.; Graham, D. R.
Context. The impulsive phase of solar flares is a time of rapid energy deposition and heating in the lower solar atmosphere, leading to changes in the temperature, density, ionisation and velocity structure of this region.
Aims: We aim to study the lower atmosphere during the impulsive phase of a flare using imaging and spectroscopic data fro…
On the evolution of environmental and mass properties of strong lens galaxies in COSMOS
Finoguenov, A.; Kneib, J. -P.; Ilbert, O. +11 more
Context. Nearly 100 new strong-lens candidates have been discovered in the COSMOS field. Among these, 20 lens candidates with 0.34 ≲ zlens ≲ 1.13 feature multiple images of background sources.
Aims: Using the multi-wavelength coverage of the field and its spectroscopic follow-up, we characterize the evolution with redshift of the e…