Search Publications
Detection of hot, abundant water toward AFGL 2591.
Heras, A. M.; Beintema, D. A.; de Graauw, T. +6 more
We present the first detection of absorption lines within the bending vibration of water in the interstellar medium using the ISO-SWS. More than 30 lines between 5.5 and 6.6µm are detected toward the bright infrared source GL 2591, which arise most likely in the dense molecular cloud core surrounding the young stellar object. Comparison with…
The wavelength calibration and resolution of the SWS.
Lutz, D.; Heras, A. M.; Beintema, D. A. +21 more
The laboratory wavelength calibration of the SWS has been succesfully transferred to the in orbit situation. The achieved accuracies for the grating sections are λ/δλ~10000. Any remaining errors in the wavelength scale are dominated by uncertainties of the relative position of the target in the 14"-20" wide slits. The grating spectral profile is v…
ISOCAM observations of low-luminosity young stellar objects in the Chamaeleon dark clouds.
Prusti, T.; Perault, M.; Olofsson, G. +19 more
We report the first results from an ISOCAM survey for low-luminosity, young stellar objects (YSOs) in nearby star formation regions. The present Letter concerns three regions within the Chamaeleon dark clouds, with a total area coverage of ~0.8 square degrees, representing 35% of the presently approved survey programme. The survey is conducted in …
The behaviour of the excess CA II H and K and Hɛ emissions in chromospherically active binaries.
Montes, D.; Fernandez-Figueroa, M. J.; de Castro, E. +1 more
In this work we analyze the behaviour of the excess Ca II H and K and Hɛ emissions in a sample of 73 chromospherically active binary systems (RS CVn and BY Dra classes), of different activity levels and luminosity classes. This sample includes the 53 stars analyzed by Fernandez-Figueroa et al. (1994) and the observations of 28 systems described by…
The rich far-infrared water vapour spectrum of W Hya.
Walker, H. J.; Omont, A.; Burgdorf, M. +40 more
We present an ISO Long Wavelength Spectrometer (LWS) grating spectrum of the oxygen-rich AGB star W Hya from 43-197µm. The spectrum is dominated by a forest of water vapour emission lines, confirming that H_2_O molecules are the dominant coolants of the winds of these stars. We have constructed an outflow model for the H_2_O spectrum of W Hy…
The cooling of the white dwarf in VW Hyi.
Gänsicke, B. T.; Beuermann, K.
We present an analysis of the post-outburst evolution of VW Hyi based on the available IUE archive data. The spectrum closest to the previous outburst (~0.5days) shows a non-negligible contribution of a disc remnant while the white dwarf (WD) dominates the later observations. Following an outburst, the accretion-heated WD cools exponentially to a …
Mid-Infrared spectrum of the zodiacal light.
Cesarsky, C.; Perault, M.; Boulanger, F. +10 more
Using the mid-infrared camera on the Infrared Space Observatory (ISO), the spectrum of a relatively empty piece of sky, dominated by zodiacal light, was measured from 5 to 16.5µm wavelength. The spectrum has no spectral features brighter than 15% of a blackbody fit to entire spectrum; the temperature of the fit is 261.5+/-1.5K. No galactic o…
HIPPARCOS distances and mass limits for the planetary candidates: 47 Ursae Majoris, 70 Virginis, and 51 Pegasi
Evans, D. W.; Arenou, F.; Lindegren, L. +19 more
Distances to the recently-discovered planetary system candidates, 47 UMa, 70 Vir and 51 Peg, are presented, based on absolute trigonometric parallaxes from the global reduction of the ESA Hipparcos astrometry satellite data. Standard errors of the parallaxes are in the range 0.66-0.76mas (milliarcsec), with resulting distances accurate to around 1…
Combined stellar structure and atmosphere models for massive stars. II. Spectral evolution on the main sequence.
Schaerer, D.; Schmutz, W.; de Koter, A. +1 more
In Schaerer et al. (1995, Paper I) we have presented the first ``combined stellar structure and atmosphere models'' (CoStar) for massive stars, which consistently treat the entire mass loosing star from the center out to the outer region of the stellar wind. The models use up-to-date input physics and state-of-the-art techniques to model both the …
First data from the ISOPHOT FIR Serendipity survey.
Kessler, M. F.; Burgdorf, M.; Lemke, D. +10 more
The ISOPHOT Serendipity Survey fills the otherwise unused slew time between ISO's fine pointings with measurements in an unexplored wavelength regime near 200µm. First results of the Serendipity Survey demonstrate its capabilities in the detection of extragalactic point sources as well as in investigations of the galactic infrared cirrus. Wi…