Search Publications
Molecular hydrogen observations of Cepheus A West.
de Graauw, T.; van der Werf, P. P.; Wright, C. M. +3 more
The Herbig-Haro complex GGD37 is an active region in the west of Cepheus A. We have used the ISO Short Wavelength Spectrometer (SWS) to investigate the physics of this region by observations of molecular hydrogen and forbidden atomic and ionic emission lines over a wide wavelength and excitation energy range. We find excitation temperatures of the…
Shockingly bright [OI] 63µm lines from the supernova remnants W 44 and 3C 391.
Reach, W. T.; Rho, J.
The brightness of the [OI] 63µm line was measured for the supernova remnants W44 and 3C391 with the ISO Long-Wavelength Spectrometer. Bright lines, ~0.3-1.4x10^-3^erg/cm^2^/sr, were detected in the 20 positions observed toward both remnants. The lines are brightest at the edges of the remnants, but they are also bright towards the remnant in…
Searching for VIMs: an astrometric method to detect the binary nature of double stars with a variable component
Wielen, R.
The photo-center of a close double star in which one component has a variable luminosity moves on the sky in the same rhythm as the total luminosity of the system varies in time. This provides an astrometric method to detect the binary nature of the system if more direct methods fail. We propose to call such systems `variability-induced movers', o…
Star formation history of the POST starburst galaxy NGC 1569.
Bomans, D. J.; Vallenari, A.
We discuss the star formation history in the post-starburst galaxy NGC 1569 using colour-magnitude diagrams derived from HST WPFC images in the F555W and F785LP filters. This galaxy has experienced a global burst of star formation from 1x10^8^yr to about 4Myr ago. Evidence has been found of older episodes of star formation from 1.5Gyr to 1.5x10^8^…
Latitudinal dependence of the radial IMF component - interplanetary imprint.
Phillips, J.; Smith, E. J.; Goldstein, B. E. +2 more
Ulysses measurements have confirmed that there is no significant gradient with respect to heliomagnetic latitude in the radial component, B_r_, of the interplanetary magnetic field. There are two processes responsible for this observation. In the corona, the plasma β is <<1, except directly above streamers, so both longitudinal and latitudin…
The ISO-SWS spectra of Luminous Blue Variables.
Heras, A. M.; Waters, L. B. F. M.; Kudritzki, R. P. +7 more
We present the infrared spectra between 2.4 and 45µm of two Luminous Blue Variables (AG Car, HR Car) observed with the Short Wavelength Spectrometer of ISO. The spectra consist of two parts: (1) the tail of the photospheric energy distribution with the free-free excess from the lower layers of the stellar wind, (2) emission from circumstella…
The starburst galaxy NGC 6090: from 2.5µm to 200µm.
Schulz, B.; Laureijs, R. J.; Abraham, P. +10 more
We have carried out broad band photometry of the interacting galaxy system NGC 6090 from 3.6 to 200µm using ISOPHOT. This is complemented by a low resolution spectrum in the wavelength range 2.5-11.5µm. The IR spectral energy distribution of a starburst galaxy is shown with unprecedented detail. From our Far Infrared measurements we ca…
Multifrequency monitoring of RU Lupi. II. The model.
Rossi, C.; Giovannelli, F.; Vittone, A. A. +4 more
The data obtained during multifrequency monitoring of extreme T Tauri star RU Lupi and presented in Giovannelli et al. (1995), are explained by a model in which a young star with a moderately strong global magnetic field is actively accreting mass from a circumstellar disk. We argue that the magnetic field pressure stops the accretion disk at the …
The chemical compositions of three main-sequence B-type stars in the Large Magellanic Cloud.
Howarth, I. D.; Dufton, P. L.; Brown, P. J. F. +1 more
High-resolution observations of three B-type main-sequence stars in the Large Magellanic Cloud (LMC) have been obtained with the UCL echelle spectrograph on the 3.9-m Anglo-Australian Telescope. These spectra and IUE low-resolution spectroscopic data have been analysed using LTE model-atmosphere techniques, to derive stellar atmospheric parameters…
Eclipses in the symbiotic system CH CYG
Bode, M. F.; Skopal, A.; Lloyd, H. M. +1 more
In this Letter we describe observational evidence of eclipses which strongly suggest that CH Cyg is a triple system with a very high inclination. We present U and V photoelectric photometry, along with optical and ultraviolet low- and high-resolution spectroscopy taken around the inferior spectroscopic conjunctions of the red giant in the symbioti…