Search Publications
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…
The ultraviolet absorption spectrum. of the z=2.72 QSO HS 1700+6416 II. Sulfur and neon in heavy-element absorbing systems.
Reimers, D.; Wamsteker, W.; Koehler, S.
We present ultraviolet spectra of the bright high-redshift QSO HS 1700+6416 obtained with the Goddard High Resolution Spectrograph (GHRS) onboard the Hubble Space Telescope. These observations cover the wavelength range 1160-1680A at a resolution R=~2000 with a maximum signal-to-noise per pixel of 8 in the raw data and 15 in smoothed data. The pre…
Extended fine structure and continuum emission from S 140/L 1204.
Burgdorf, M.; Serra, G.; Barlow, M. J. +24 more
Grating spectra, covering the wavelength range 45 to 187µm have been taken with the ISO Long Wavelength Spectrometer (LWS) at a series of pointing positions over the S 140 region, centred on the cluster of embedded young stellar objects at the south-west corner of the L1204 molecular cloud. Extended emission from [CII]158µm and [OI]63&…
Latitude dependence of Solar Wind plasma thermal noise: ULYSSES radio observations.
Maksimovic, M.; Issautier, K.; Moncuquet, M. +2 more
Thermal noise spectroscopy was performed on the URAP radio receiver data for the first time out of the ecliptic during the Ulysses spacecraft transit from southern to northern heliolatitudes. We present the results on the solar wind electron density and bulk temperature obtained from -43°S to +43°N. They indicate a rough symmetry of the solar wind…
A wind in the intermediate polar candidate 1 H0551-819?
Bonnet-Bidaud, J. M.; Buckley, D. A. H.; Mouchet, M. +3 more
IUE observations of the cataclysmic variable 1 H0551-819 obtained at three different epochs reveal P-Cygni type profiles in the CIV line. The shape of these profiles is modulated with the orbital period of the system. The observations suggest the presence of a wind in the system. We considered several models of wind, disc and continuum emitting ho…