Search Publications
Interstellar extinction in the Small Magellanic Cloud.
Nandy, K.; Willis, A. J.; Wilson, R. +5 more
IUE observations of three considerably reddened stars located near the core of the Small Magellanic Cloud and of two comparison stars which are also SMC members are presented. This region contains a considerable amount of dust. The UV spectrum of one of the reddened stars (BBB 338) shows the 2200-A wavelength feature characteristic of the Galactic…
IUE observations of the Lac object AO 0235+164.
Boksenberg, A.; Penston, M. V.; Snijders, M. A. J. +1 more
AO 0235+164 was observed with IUE during its February 1979 outburst. The object was detected in both the short and long wavelength cameras. Hydrogen Lyman-alpha absorption in the z = 0.524 system is detected with equivalent width of 62 + or - 28 A (1-sigma error). From this and previous 21-cm data, the spin temperature of the absorbing material is…
Interstellar extinction in the Perseus arm.
Nandy, K.; McLachlan, A.; Morgan, B. L.
Individual UV extinction curves for nine stars located in the direction of h and Chi Persei in the distance range 0.6-4.4 kpc are presented. The observations were made with the International Ultraviolet Explorer (IUE) in the low dispersion mode with large aperture. The sample has been enlarged by the use of available UV and visible data for 32 red…
Ultraviolet spectra of planetary nebulae. VII. The abundance of carbon in the very low excitation nebula HE 2-131.
Seaton, M. J.; Adams, S.
Features observed in infrared spectra suggest that certain very low excitation (VLE) nebulae have low C/O abundance ratios (Cohen & Barlow 1980; Aitken & Roche 1982). Fluxes in the multiplets [O II] sun2470 and [O II] λ2326 have been measured for the VLE nebula He 2-131 = HD 138403 using lUE high-dispersion spectra. An analysis …
Effective temperatures and radii of Large Magellanic Cloud supergiants.
Nandy, K.; Willis, A. J.; Wilson, R. +3 more
The absolute fluxes and flux distributions of 25 Large Magellanic Cloud supergiants are compared to those of similar galactic stars. The effective temperatures and radii of the LMC stars are found by comparison with models. No significant difference between the LMC and our Galaxy is found.
Molecules in celestial objects - III. Study of CO in interstellar diffuse clouds.
Krishna Swamy, K. S.; Tarafdar, S. P.
The absorption lines corresponding to the A-X transition of CO have been looked for in the IUE spectra of 14 stars with varying values of the colour excess, E(B-V) and found to be present in the spectra of nine stars with E(B-V) at least 0.28. The column density of CO has been determined towards these nine stars and its upper limit towards the res…
Mira B.
Stickland, D. J.; Cassatella, A.; Ponz, D.
A high resolution IUE spectrum of Mira taken at the time of the 1980 maximum shows sharp emission features from the M star and broad ones attributable to a large volume of gas around the hot companion. Some information on the emission from the vicinity of Mira B is available from line widths and ratios.
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…
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 …
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.