Search Publications
UV light curves of thermonuclear supernovae
Sorokina, E. I.; Blinnikov, S. I.
Ultraviolet light curves are calculated for several thermonuclear supernova models using a multifrequency radiation hydrodynamic code. It is found that Chandrasekhar-mass models produce very similar light curves both for detonation and deflagration. Sub-Chandrasekhar-mass models essentially differ from ``normal'' Chandrasekhar ones regarding behav…
RX J1313.2-3259, a missing link in CV evolution?
Gänsicke, B. T.; Beuermann, K.; de Martino, D. +1 more
We present low-state IUE spectroscopy of the ROSAT-discovered polar RX J1313.2-3259. The SWP spectrum displays a broad Lyalpha absorption profile, which can be fitted with a two-temperature model of a white dwarf of T_wd=15 000 K with a hot spot of T_spot=34 000 K which covers f ~ 0.01 of the white dwarf surface. The white dwarf temperature is aty…
Shock excited far-infrared molecular emission around T Tau
White, G. J.; Palla, F.; Pezzuto, S. +9 more
The first complete far-infrared spectrum of T Tau has been obtained with the LWS spectrometer on-board the Infrared Space Observatory (ISO), which detected strong emission from high-J (J=14-25) CO, para- and ortho-H_2O and OH transitions over the wavelength range from 40 to 190 mu m. In addition the [OI]63mu m, [OI]145mu m and [CII]158mu m atomic …
SUMER observations of transition region fine structures
Mason, H. E.; Landini, M.; Lemaire, P. +1 more
The SUMER (Solar Ultraviolet Measurements of Emitted Radiation) instrument on SOHO (Solar and Heliospheric Observatory) provides an opportunity to observe and study the solar transition region with high spatial and spectral resolution. We present new evidence to confirm that the emission from the quiet Sun at 2x 105 K is dominated by co…
Hydrogen temperature gradient in the transition region of a solar coronal hole
Wilhelm, K.; Tu, C. -Y.; Marsch, E.
The Lyman series of hydrogen was observed by SUMER on SOHO on the north polar limb of the Sun with a total exposure time of more than ten hours. The resulting line profiles have been analysed using the technique described by Marsch et al. (1999). The data analysis corroborates earlier findings on the Lyman lines, but also yields phenomena which ca…
The Sombrero galaxy. III. Ionised gas and dust in the central 200 pc: a nuclear bar?
Emsellem, E.; Ferruit, P.
We present the results of new 3D TIGER spectroscopic observations and archived HST/WFPC2 and NICMOS images of the central region of M 104. The [N ii]+Hα images reveal the presence of a nuclear spiral structure, and the gaseous kinematics in the central arcsecond shows evidence for kinematical decoupling of the central peak. A straight nuclear dust…
DENIS and ISOGAL properties of variable star candidates in the Galactic Bulge
Alard, C.; Blommaert, J. A. D. L.; Ganesh, S. +9 more
Repeated DENIS observations (summer 1996 & 1998) in the J (1.25 mu m) and the KS (2.15 mu m) bands are used to look for variable stars. We present two catalogues of ~ 1000 probable variables in an area of ~ 4 deg2 of the inner galactic bulge. The first one contains ~ 720 variable star candidates which show variability in …
Far infrared spectroscopy of FU Ori objects. ISO-LWS observations
Liseau, R.; White, G. J.; Benedettini, M. +12 more
We present the results of the first spectrophotometric observations of a sample of FU Ori objects obtained with the Long Wavelength Spectrometer (LWS) on board the Infrared Space Observatory (ISO). The [OI] (63 mu m) and the [CII] (158 mu m) lines are commonly observed in all spectra (both ON and OFF source). The observational novelty is the prese…
Mechanisms for dynamic coronal mass supply via evaporative solar ``micro-events''
Güdel, M.; Krucker, S.; Benz, A. O. +1 more
The idea that the corona is at least in part supplied by chromospheric evaporation in loop ``micro-events" is quantified in terms of the power requirements of evaporation mechanisms, using recent analyses of data on such events in high temperature EUV lines from the SoHO EIT instrument. Estimates are derived for the pre-event and event values of l…
The ISO spectroscopic view of the HH 24-26 region
White, G. J.; Benedettini, M.; Lorenzetti, D. +6 more
We report the results of an investigation, performed with the ISO spectrometers (LWS and SWS), on the star forming region associated with the Herbig-Haro objects HH 24-25 and 26. Low-resolution LWS spectra (45-197 mu m) were observed towards the HH24MMS, HH25MMS and HH26IR sources as well as the HH26IR outflow. In addition, SWS scans of the pure H…