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The 1979 outburst of U Scorpii.
Willis, A. J.; Barlow, M. J.; Watson, M. G. +8 more
Optical and ultraviolet observations are presented of the 1979 outburst of the recurrent nova U Sco. For the first time the evolution through outburst is documented photometrically and spectroscopically. Lines of the following ions are identified: H I, He II, C IV, N III, N IV, N V, O IV, O VI and Si IV. No forbidden lines were observed. Mg I was …
Anomalous extinction in the planetary nebula Abell 30.
Greenstein, J. L.
The stellar continuous energy distribution from 8000 to 1250 A in Abell 30 is quite peculiar. The observed flux can be understood if a hot central star (approximately 200,000 K) is immersed in an absorbing dust cloud which has anomalous absorption with its peak near 2470 A. The dust nebula is a strong infrared source, maintained by conversion of t…
Ionized species observed in the spectrum of the nearby white dwarf G 191-B2B.
Kondo, Y.; Bruhweiler, F. C.
High-resolution spectra of the nearby (48 pc) white dwarf G191-B2B, obtained with the International Ultraviolet Explorer, reveal sharp resonance lines of N V, C IV, and Si IV. The origin of these features is most likely linked to the white dwarf, possibly being formed in an expanding halo around the star. Interstellar lines of C II, N I, Mg II, Si…
IUE observations of two elliptical galaxies : NGC 3379 and NGC 4472.
Capaccioli, M.; Oke, J. B.; Bertola, F.
The International Ultraviolet Explorer observations of the nuclei of the elliptical galaxies NGC 3379 and NGC 4472 show that the flux drops rapidly with decreasing wavelength until about 2300 A, below which the flux increases rapidly. The hot UV component of the radiation can be approximately represented by a blackbody at 30,000 K. The spectra of …
On the relationship between coronae and mass loss in late-type stars.
Raymond, J. C.; Dupree, A. K.; Hartmann, L.
High-dispersion spectra taken with the IUE are used to examine the temperature stratification of the wind of the hybrid atmosphere star Alpha TrA (K4 II). C IV emission is shown to have a line width of 150-200 km/s, with Si III and C III exhibiting 100 km/s widths. It is suggested that the line widths reflect wind expansion, with C IV formed in an…
Concerning the Wolf-rayet and other luminous early-type stars.
Underhill, A. B.
Effective temperatures, radii, and luminosities were determined from S2/68, ANS, UBV, and uvby photometry for four B0/B1 supergiants, four O4 stars, and four WN7/WN8 stars as well as for four test stars having spectral types between B1.5 V and 09 V and five stars with known angular diameters and effective temperatures. The effective temperatures o…
Ultraviolet extinction in the Small Magellanic Cloud.
Ferlet, R.; Lequeux, J.; Prevot, L. +2 more
The considered investigation is concerned with the determination of the UV extinction curve in the Galaxy on the basis of the spectra of stars in the SMC obtained with the aid of the International Ultraviolet Explorer. The determination rests on the comparison of the observed spectral energy distribution of pairs of similar stars with different ex…
On the origin and distribution of C IV and SI IV ions in the neighboring interstellar medium.
York, D. G.; Cowie, L. L.; Taylor, W.
IUE spectrometer observational data are reported on the C IV, Si IV, and N V absorption lines in 46 distant stars at FWHM resolution of 30 km/sec. A simple analytic theory is given for these contributions, including the effects of ionization by a soft X-ray background. While for some of the most distant field stars a photoionized contribution may …
Mass loss from O subdwarfs.
Kudritzki, R. P.; Hamann, W. -R.; Gruschinske, J. +1 more
The P Cygni profiles are reproduced by comoving frame calculations, and a determination is made of the wind parameters. Lower limits of mass loss for these stars (HD 49798 and HD 128220 B) are derived, and upper limits for all four objects are estimated on the basis of general considerations. The empirical results are compared with the available t…
The ultraviolet spectrum of the O-type subdwarf HD 49798.
Kondo, Y.; McCluskey, G. E.; Bruhweiler, F. C.
The O-type subdwarf (O6p) single-lined spectroscopic binary HD 49798, with an orbital period of 1.5477 d, has been observed by the International Ultraviolet Explorer satellite, to aid in analyses of O type photospheres. Four high resolution (0.1A) spectra are found in the far-ultraviolet region, and two high resolution (0.2A) spectra are found in …