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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&…
The binary Cepheid W Sgr.
Cottrell, P. L.; Albrow, M. D.
High-resolution spectra have been obtained over a seven-year period for the 7.6 d binary Cepheid W Sgr. Radial velocities measured from these spectra have been combined with those measured with the CORAVEL radial velocity spectrometer and a new orbital solution obtained with the parameters P = 1603 d, K = 1.90 km s-1, e = 0.42. Velociti…
Pulsations in the Ultraviolet and X-Ray Spectra of VELA X-1
Nagase, Fumiaki; McCray, Richard; Boroson, Bram +1 more
In simultaneous observations with the Faint Object Spectrograph aboard the Hubble Space Telescope and the large-area counters aboard Ginga, we obtained time-resolved ultraviolet and X-ray spectra of the X-ray binary HD 77581/4U 0900-40 (Vela X-1) during inferior conjunction of the X-ray source. We detected pulsations at the 283.33 s X-ray pulse pe…
The origin of the correlation between the UV and X-rays in NGC 4151
Zdziarski, Andrzej A.; Magdziarz, Pawel
We propose that the UV/X-ray correlation observed in NGC 4151 by EXOSAT and IUE is due to re-emission of the X-ray flux absorbed by cold clouds in the line of sight. This transmission model satisfies the energy balance, provides a good fit to the X-ray and UV data, and predicts no Compton reflection of X-rays (as observed). Alternatively, the corr…
Far-Ultraviolet Stellar Photometry: Fields Centered on rho Ophiuchi and the Galactic Center
Schmidt, Edward G.; Carruthers, George R.
Far-ultraviolet photometry is presented for 121 objects in a 20 diameter field centered on ρ Oph and for 649 objects in a field covering the Galactic center. Broadband magnitudes with effective wavelengths of 1375 Å and 1781 Å are given. The Galactic center field overlaps two fields which were discussed in an earlier paper. Eighty- eight percent o…
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…
The Eclipse of the Symbiotic Star BF CYG
Pereira, Claudio Bastos; Landaberry, Sayd Jose Codina
Like SY Mus and EG And, BF Cyg is another classical symbiotic system where the effects of Rayleigh scattering can be observed close to eclipse. Here we re-analyzed the ultra-violet observations made by lUE between 1979 and 1989 in order to study the continuum variations due to eclipse effects. We concluded that besides Rayleigh scattering as sourc…
IUE Observations of Young Clusters in the Large Magellanic Cloud
Hodge, Paul W.; Wilcots, Eric M.; King, Nichole
We present the results of a study of the ultraviolet properties of the most massive stars in two young clusters in the Large Magellanic Cloud (LMC), NGC 1770 and NGC 2014. Although there is some variation across each cluster, we find that the properties of the interstellar extinction toward these clusters are consistent with those previously deriv…
Ulysses cosmic-ray investigations extending from the south to the north polar regions of the Sun and heliosphere.
Simpson, J. A.
The recent rapid transit of Ulysses from the solar south polar to the north polar region has confirmed the earlier findings by the COsmic-ray and Solar-Particle INvestigations (COSPIN) international consortium and has yielded additional discoveries that are important for understanding heliospheric modulation. High-resolution isotopic measurements …
Corotating shock accelerated particles guided by wavy spiral magnetic fields in the solar wind at high heliographic latitudes
Lou, Yu-Qing
We propose the persistent presence of randomly fluctuating, large-amplitude, long-timescale wavy spiral magnetic fields in the solar wind at all heliographic latitudes. These Alfvénic fluctuations can be generated by gradual evolution of solar coronal holes or by interplanetary Kelvin-Helmholtz instabilities occurring around the two conical interf…