Search Publications
Latitude variations of ~7MeV and >300MeV cosmic ray electron fluxes in the heliosphere: ULYSSES COSPIN/KET results and implications.
Sierks, H.; Kunow, H.; Wibberenz, G. +8 more
The 160° latitude scan performed in less than one year between summer 1994 and summer 1995 by Ulysses allowed us to obtain unique data about the latitudinal dependence of the cosmic ray fluxes. We present in this paper results on the electron component derived from the COSPIN/KET instrument onboard Ulysses, both at MeV and GeV energies. The variat…
R4 in the Small Magellanic Cloud: a spectroscopic binary with a B[e]/LBV-type component.
Stahl, O.; Zickgraf, F. -J.; Wolf, B. +3 more
During the past twelve years we observed several spectra of the B[e] star R4 in the SMC with CASPEC at ESO, La Silla. We also obtained UBV(RI) and JHK photometry during various occasions at La Silla. Further photometry was available in the literature. Brightness variations typical for LBVs of about 0.7mag in V were found. The optical spectra are d…
First detection of the 56-µm rotational line of HD in Saturn's atmosphere.
Ade, P. A. R.; Lellouch, E.; Encrenaz, T. +25 more
The R(1) rotational line of HD at 56.23µm has been detected for the first time on Saturn using the Long Wavelength Spectrometer (LWS) on board the Infrared Space Observatory (ISO). The measurements were made using the LWS in Fabry-Perot mode in January 1996 during the ISO performance verification phase. The measured spectrum has been compare…
LWS observations of the bright rimmed globule IC 1396N.
Ade, P. A. R.; Liseau, R.; White, G. J. +36 more
We present the first far-infrared spectrum of the IRAS source associated with IC 1396N, located in the HII region IC 1396 together with submillimeter and millimeter photometry. A rich spectrum of CO, OH, and H_2_O lines are detected in the ISO-LWS spectrum, indicative of a warm, dense region, probably shock excited, around the source. Among the fi…
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…