Search Publications
S I emission in EUV spectra of late-type stars.
Jordan, C.; Brown, A.
Observations of strong neutral sulfur emission lines in the EUV spectra of late-type giant and supergiant stars are discussed. Low- and high-resolution spectra of Alpha Tauri and Beta Gru are presented which demonstrate the contribution of the S I (UV 9) multiplet to the observed features at approximately 1296 A as well as the strong O I multiplet…
Ultraviolet observations of WZ SGE in outburst.
Fabian, A. C.; Pringle, J. E.; Stickland, D. J. +1 more
The paper describes low and high-resolution UV spectroscopic observations of the recurrent nova WZ Sge obtained during its December 1978 outburst. The observations were made during outburst with the IUE satellite. Low-resolution images obtained on December 14 and 24 are discussed. The continuum on both days may be fitted by a power law or an optic…
Ultraviolet spectra of planetary nebulae. II. The young PN IC 4997.
Flower, D. R.
Observations of the planetary nebula IC 4997 made with the International Ultraviolet Explorer satellite are analyzed in conjunction with visual photoelectric observations. The extinction to the nebula and the electron temperature and density are deduced from the relative intensities of lines emitted by O(+) and O(2+) ions. The relative abundance o…
Ultraviolet studies of the Magellanic Clouds-I. Interstellar lines inthe spectra of FD 70 and SK -71 45.
Nandy, K.; Willis, A. J.; Gondhalekar, P. M. +1 more
High dispersion ultraviolet spectra of the two LMC members, HD 38282 (FD 70) and HD 269676 (SK-71-45), have been obtained with IUE. Velocity profiles have been presented of the numerous interstellar lines observed in the spectra of these stars and associated with the absorption in both the Galaxy and the LMC. In both lines-of-sight well defined in…
The UV spectrum of the narrow emission line X-ray emitting nucleus ofthe galaxy NGC 7582.
Penston, M. V.; Clavel, J.; Macchetto, F. +5 more
UV spectra of the narrow emission line, X-ray emitting nucleus of the galaxy NGC 7582 obtained with the IUE instrument show a steep featureless continuum, obeying a power-law of spectral index 3.4 + or - 0.4, close to the value of Ward et al. (1978) for the visible spectrum (spectral index equal to 3). The visual extinction on the line-of-sight of…
HD 15570 : a star intermediate between Of and WN7 ?
Willis, A. J.; Stickland, D. J.
IUE ultraviolet observations of HD 15570, classified in the visible as O4f, show the presence of N IV wavelength 1486 and He II wavelength 1640 strongly in emission, spectral characteristics which are signatures of WN stars rather than Of stars. A comparison of the UV spectra of this star with those of Xi Pup (O4f), HD 164794 (O4V) and HD 93131 (W…
IUE and balloon spectral observations of mass loss from BET Ori.
Bates, B.; Giaretta, D. L.; McCartney, D. J. +2 more
New observations are presented of the ultraviolet spectrum of Beta Ori which were obtained from the International Ultraviolet Explorer and from a high resolution, balloon-borne spectrograph. The blue-shifted, high velocity components (HVC) in the Mg II resonance lines indicate that a small deceleration of the material relative to the star has occu…
IUE observations of Large Magellanic Cloud members.
Nandy, K.; Morgan, D. H.
Spectra and flux distributions in the wavelength range 1150-3100 A are presented for six supergiants ranging from O to late B in the Large Magellanic Cloud. The stars were observed with the IUE in its low resolution mode.
Interstellar carbon monoxide in the direction of the SNR S 147.
Gondhalekar, P. M.; Phillips, A. P.
The paper examines interstellar carbon monoxide in the direction of the supernova remnant S147. The electronic bands in the fourth positive system of (C-12)(O-16) were detected in absorption in the ultraviolet spectrum of the Ble star HD 36665. The line of sight to this star is 1 deg away from the center of the supernova remnant S147 and the star …
A Large Magellanic Cloud member intermediate between Of and WN 7.
Nandy, K.; Willis, A. J.; Gondhalekar, P. M. +1 more
IUE observations of SK-65-22 (O6Iaf+) in the Large Magellanic Cloud show semiforbidden N IV 1486 A and He II 1640 A emission lines, characteristics of 'transition WR' stars, as well as the normal Of P Cygni lines. The spectrum of this star is compared with those of WN7 and normal Of LMC members and appears to be intermediate in character. The abso…