Search Publications
Effects of the heliospheric interface on the interplanetary Lyman alpha glow seen at 1 AU from the Sun
Izmodenov, V.; Quémerais, E.
This work presents multiple scattering computations of interplanetary background line profiles using Angle Dependent Partial Frequency Redistribution to model the scattering process as explained by Quémerais (\cite{Quemerais00}). The density and velocity distribution of hydrogen atoms in the heliosphere was computed using a self-consistent model o…
Solar differential rotation determined by tracing coronal bright points in SOHO-EIT images. II. Results for 1998/99 obtained with interactive and automatic methods
Vršnak, B.; Wöhl, H.; Clette, F. +3 more
Full-disc solar images obtained with the Extreme Ultraviolet Imaging Telescope (EIT) on board the Solar and Heliospheric Observatory (SOHO) were used to analyse solar differential rotation by tracing coronal bright points. The results obtained with the interactive and the automatic method for the time period June 4, 1998 to May 22, 1999 are presen…
On the anomaly of Balmer line profiles of A-type stars. Fundamental binary systems
Smalley, B.; Bessell, M. S.; Kupka, F. +1 more
In previous work, Gardiner et al. (\cite{GKS99}) found evidence for a discrepancy between the Teff obtained from Balmer lines with that from photometry and fundamental values for A-type stars. An investigation into this anomaly is presented using Balmer line profiles of stars in binary system with fundamental values of both Teff
An atlas of 2.4 to 4.1 mu m ISO/SWS spectra of early-type stars
Waters, L. B. F. M.; Kaper, L.; Hony, S. +5 more
We present an atlas of spectra of O- and B-type stars, obtained with the Short Wavelength Spectrometer (SWS) during the Post-Helium program of the Infrared Space Observatory (ISO). This program is aimed at extending the Morgan & Keenan classification scheme into the near-infrared. Later type stars will be discussed in a separate publication. T…
High-resolution study of the young stellar objects in Mon R2 IRS 3
Weigelt, G.; Schertl, D.; Preibisch, T. +1 more
We present a bispectrum speckle interferometry study of the embedded young stellar objects in Mon R2 IRS 3 in the near-infrared H and K bands. Our images with a resolution of 75 mas (cor 62 AU) show a close triple system surrounded by strong diffuse nebulosity and three additional infrared sources (K magnitudes ~ 11.8-13.7) within 3'' of the brigh…
Balmer lines emission region in NGC 3516: Kinematical and physical properties
Jovanović, P.; Popović, L. Č.; Mediavilla, E. G. +1 more
We have studied the Balmer line shapes of NGC 3516 in order to find the structure of central Emission Line Region (ELR) and the physical parameters of the emitting plasma. The shapes of these broad emission lines show evidences of a multicomponent origin and also features which could be identified as the peaks of a rotating disc. We have proposed …
The spectroscopic orbits and the geometrical configuration of the symbiotic binary AR Pavonis
Mikołajewska, J.; Quiroga, C.; Brandi, E. +2 more
We analyze optical and near infrared spectra of intermediate and high resolution of the eclipsing symbiotic system AR Pavonis. We have obtained the radial velocity curves for the red and the hot component from the M-giant absorption lines and from the wings of Hα , Hβ and He II lambda 4686 emission profiles, respectively. From the orbital elements…
A multiwavelength timing analysis of the eclipsing polar DP Leo
Gänsicke, B. T.; Kanbach, G.; Schwope, A. D. +2 more
We present an analysis of the X-ray light curves of the magnetic cataclysmic variable DP Leo using recently performed XMM-Newton EPIC and archival published and unpublished ROSAT/ PSPC observations. We combine the timings of the X-ray eclipses with timings derived from archival HST-observations and new optical observations with the photon counting…
The anomalous X-ray pulsar 1E 1048.1-5937: Phase resolved spectroscopy with the XMM-Newton satellite
Tiengo, A.; Mereghetti, S.; Staubert, R. +1 more
We report on an observation of the anomalous X-ray pulsar 1E 1048.1-5937 performed with the XMM-Newton satellite. The phase averaged spectrum of 1E 1048.1-5937 is well described by the sum of a power law with photon index ~ 2.9 and a blackbody with temperature ~ 0.6 keV, without evidence for significant absorption or emission lines. The above spec…
Far-infrared and molecular line observations of Lynds 183 - Studies of cold gas and dust
Prusti, T.; Juvela, M.; Lemke, D. +3 more
We have mapped the dark cloud L183 in the far-infrared at 100 mu m and 200 mu m with the ISOPHOT photometer aboard the ISO satellite. The observations make it possible for the first time to study the distribution and properties of the large dust grains in L183 without confusion from smaller grains. The observations show clear colour temperature va…