Search Publications
SWS H_2_ observations in the BD+40 4124 group.
Heras, A. M.; Prusti, T.; van den Ancker, M. E. +10 more
We report the detection of pure rotational lines of H_2_observed in the direction of three young stellar objects in the BD+40 4124 group, with the short-wavelength spectrometer (SWS) on board ISO. The rotational population distributions of all three stars are consistent with a thermal distribution. The derived kinetic temperatures are =~500K for B…
Very small grain emission in NGC 7023.
Walker, H. J.; Lemke, D.; Schulz, B. +10 more
We observed the reflection nebula NGC 7023 at various positions using wide and narrow band photometry centred on the 7.7 and 11.3µm PAH emission features and wide band photometry at 20 and 25µm. No significant variations have been detected over the nebula in the 7.3 and 20µm continuum relative to the total emission in the 6-15&mi…
Type III radio bursts observed by ULYSSES pole to pole, and simultaneously by wind.
Robinson, P. A.; Bougeret, J. -L.; Hoang, S. +2 more
We consider 555 type III bursts observed by Ulysses and/or Wind while Ulysses traversed a large range of longitude and latitude. We find: 1) The percentage of bursts seen by both spacecraft was 59.5%. It was higher, about 80%, when Ulysses was to the south and east of the Sun as seen from Wind. It decreased to about 50% when Ulysses was near the e…
ULYSSES spacecraft observations of radio and plasma waves: 1991-1995.
Balogh, A.; MacDowall, R. J.; Phillips, J. L. +3 more
The radio and plasma wave investigation of the Ulysses spacecraft mission provided nearly continuous observations of wave electric fields (less than 1MHz) and magnetic fields (less than 450 Hz) from spacecraft launch in late 1990 through perihelion in 1995 and beyond. The Ulysses spacecraft reached heliographic latitudes of +/-80deg, providing a u…
First HST/FOC images of the low mass companion of the astrometric binary Gliese 623.
Barbieri, C.; Nota, A.; Ragazzoni, R. +4 more
We have resolved the astrometric binary Gliese 623 into two components, by direct imaging in the visible band, with the COSTAR corrected FOC. The images clearly show the faint companion Gliese 623B, with a derived absolute magnitude of M_V_=16.17+/-0.10, at a distance of 0.33" from the primary (namely at 2.51AU, assuming a parallax of π=0.132", i.…
Rotational modulation and flares on RS Canum Venaticorum and BY Draconis stars. XIX. Simultaneous IUE, ROSAT, VLA, and visual observations of TY Pyxidis.
Pagano, I.; Linsky, J. L.; Neff, J. E. +4 more
In November 1990, we observed the eclipsing binary system TY Pyxidis with the IUE satellite simultaneously with the ROSAT All-Sky Survey. The IUE and ROSAT/WFC observations covered the 3.2-day period of this system continuously, while the ROSAT/PSPC coverage was limited to 2.26days. We also observed TY Pyx with the VLA for a total of 22 hours thro…
ISOPHOT observations of R CrB: a star caught smoking.
Walker, H. J.; Richards, P. J.; Klaas, U. +2 more
R CrB is a very unusual star, being extremely hydrogen deficient and undergoing irregular deep minima in its visible light. R CrB started to undergo a fading episode in October 1995. The Infrared Space Observatory (ISO) observed the star after it had faded by 7 magnitudes. The inner, warm dust shell has been observed by ISOPHOT, using the long wav…
Low energy charged particles in the high latitude heliosphere.
Lanzerotti, L. J.; Armstrong, T. P.; Gold, R. E. +3 more
Low energy ion and electron measurements made over the south and north polar regions of the sun by the HI-SCALE instrument on the Ulysses spacecraft during its solar minimum polar passages are summarized. The polar flux levels were considerably reduced in comparison to fluxes in the vicinity of the heliospheric current sheet. Flux variations with …
A first glimpse into ISM/ICM connections at z=0.2 with ISOCAM.
Altieri, B.; Aussel, H.; Elbaz, D. +10 more
Although it is well established that the cluster environment affects the gas content and massive star formation in galaxies, the mechanisms have not yet been unambiguously identified. In order to elucidate some of the processes responsible, an ISO Core Programme - DEEPXSRC - is dedicated to deep observations of medium redshift rich clusters of gal…
The variable Herbig AE star HR 5999. XII. Its circumstellar extinction law.
Perez, M. R.; The, P. S.; van den Ancker, M. E. +1 more
A study of the extinction law in the UV-visual-IR spectral regions has been made towards the variable Herbig Ae star HR 5999 at three brightness levels V=6.9mag, 7.2mag, and 7.3mag. For comparison we have made an equivalent study of its proper motion non-variable companion HR 6000, which is embedded in the same dark cloud. The extinction law towar…