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The width of echelle orders in IUE images as derived with the astronomical image display and analysis /AIDA/ system in Tuebingen
de Boer, K. S.; Preussner, P. -R.; Grewing, M.
This paper describes the image display and analysis facilities developed at the Astronomical Institute in Tübingen. The software governing the system is highly modular and allows easy addition of further routines. With this system we have determined the width of the echelle orders in International Ultraviolet Explorer geometrically and photometric…
Mass loss from Be stars derived from UV spectra.
de Freitas Pacheco, J. A.
The present investigation considers the interpretation of UV line profiles of some Be stars obtained with the International Ultraviolet Explorer (IUE) spacecraft, giving particular attention to Pi Aqr. The mass-loss rates are estimated using the Sobolev approximation and assuming that the observed asymmetric UV lines are formed in an expanding env…
A brightness of the symbiotic variable SY Mus.
Feibelman, W. A.; Kafatos, M.; Michalitsianos, A. G. +1 more
The symbiotic variable SY Muscae has been observed with IUE in September 1980 and June 1981 and in the photographic region in May 1981. The entire ultraviolet spectrum brightened between September and June by about a factor of 5. The spectrum shows high excitation including emission from N v and high electron density, about 10-billion per cu cm as…
The physical state of the gas towards HD 93206.
Welsh, B. Y.; Thomas, C. K.
A description is presented of a high resolution study of the ultraviolet spectrum of the star HD 93206 using the IUE satellite. This star is among those observed at optical wavelengths by Walborn and Hesser (1975) and belongs to the Cr 228 association which lies approximately 15 arcmin south of the peculiar object of Eta Car. This star is part of …
The pulsation of the outer layers of the BET CEP star SIG Sco.
de Jager, C.; Burger, M.; van den Oord, G. H. J.
The pulsation of the outer layers of the Beta Cephei-type variable σ Sco is investigated using 17 ultraviolet spectrograms (1200-2000 A) obtained during seven hours of observations with the International Ultraviolet Explorer. A pulsational model established earlier for BW Vul is confirmed. According to this model, after a period of photospheric re…
On structure of the outer layers of the cool carbon stars.
Querci, M.; Querci, F.; Cassatella, A. +2 more
Exposures on the spectra of four late C-type stars have been made with the IUE satellite in the wavelength range of the LWR camera (1900-3200 A). Two Mira variables near maximum light and two semiregular variables were observed. Although the exposure times used, which range up to 240 min in the low-resolution mode, were more than sufficient to rec…
IUE low-dispersion spectra of six luminous stars in symmetric nebula.
Johnson, H. M.
The stars and nebulae are HD 156738 and HDE 319703A, respectively centered in a pair of symmetric nebulae among the NGC 6334 group, AG Car in its nebula, HDE 250550 in nebula 8 of a catalog by Herbig, 209 BAC in Ml-67, and HD 89358 in NGC 3199. These include two O stars, two WN stars, an unstable B supergiant, and a ZAMS B star. Four of them are a…
Infrared, optical and ultraviolet observations of TT Ari.
Jameson, R. F.; King, A. R.; Sherrington, M. R.
B, V, J and K light curves together with the IUE ultraviolet spectrum of the cataclysmic variable TT Arietis are presented. The interpretation of these data leads to a system distance of 100 pc and outer disc temperature of 11,000-12,500 K.
Discrete sources of cosmic gamma rays
Wolfendale, A. W.; Li, T. P.
The possibility is considered that some unidentified gamma-ray sources are in fact not discrete sources but rather 'apparent sources' caused by cosmic-ray irradiation of the clumpy interstellar medium. It is shown that six of nine unidentified gamma-ray sources in the 2CG catalog can be explained in terms of the mechanism considered and that the s…
IUE observations of UV absorption in the spectrum of the C2 white dwarf L 1363-3.
Koester, D.; Weidemann, V.; Vauclair, G.
Strong ultraviolet absorption features have been observed in a short wavelength IUE spectrum of the weak carbon white dwarf L1363-3. The spectrum is quite similar to those obtained for the weak C2 white dwarf L145-141 and the DC white dwarf G33-49 and shows strong absorption at 1920 A and between 1520 A and 1680A. Identification with carbon absorp…