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International Ultraviolet Explorer observations of hyades stars.
Antiochos, S. K.; Stern, R. A.; Zolcinski, M. C. S. +1 more
A description is presented of International Ultraviolet Explorer (IUE) satellite observations of transition region and chromospheric emission from a group of Hyades dwarfs which are strong X-ray emitters as seen in a survey conducted by Stern et al. (1981). Short-wavelength spectra (1175-2000 A) and long-wavelength spectra (1900-3200 A) have been …
Ultraviolet absorption by highly ionized atoms in the Orion Nebula.
Savage, B. D.; Franco, J.
The International Ultraviolet Explorer was used to obtain high-resolution, far-UV spectra of theta 1 A, theta 1 C, theta 1 D, and theta 2 A Orionis. The interstellar absorption lines in these spectra are discussed with an emphasis on the high-ionization lines of C IV and Si IV. Theta 2 A Ori has interstellar C IV and Si IV absorption of moderate s…
First ultraviolet observations of two new cataclysmic variables 1E 0643-1648 and 4U 1849-31.
Motch, C.; Bonnet-Bidaud, J. M.; Mouchet, M.
The two hard X-ray sources 1 E0643-1648 and 4U 1849-31 have been observed in the range 1200-3200 Å with I.U.E.. They show ultraviolet spectra typical of cataclysmic variables. The distances inferred from the ultraviolet interstellar extinction are 300 pc and 600 pc respectively for 1 E0643-1648 and 4U 1849-31.
The line spectrum is characteriz…The interstellar spectrum of the supernova 1980k in NGC 6946.
Panagia, N.; Savage, B. D.; Boksenberg, A. +10 more
Bright supernovae in external galaxies offer a rare opportunity to probe the intervening interstellar media over very extended path-lengths, including the disk and halo of the Galaxy and the parent galaxy of the supernova. SN 1980k was discovered in NGC 6946 on 1980 October 29. In the first month after discovery, high resolution optical and ultrav…
A study of ultraviolet spectroscopic and light variations in the X-ray binaries LMC X-4 and SMC X-1.
Zuiderwijk, E. J.; Hammerschlag-Hensberge, G.; van der Klis, M. +7 more
Low-resolution IUE spectra of the massive X-ray binaries LMC X-4 and SMC X-1 have been obtained between 1200 and 3200 A at several epochs in August 1979 and April 1980. Comparison of these observations with theoretical light curves for an X-ray heated tidally distorted star indicates the existence of a disk around the compact star. The resonance-l…
The hot component of KS Per (HD 30353)
Drilling, J. S.; Schonberner, D.
The presence of a hot companion for the single-lined spectroscopic binary KS Per (HD 30353) has been detected in a study of low-resolution IUE spectra. The system as a whole is very similar to Upsilon Sgr. The observations are consistent with a model in which the primary is a helium supergiant of about 1 solar mass and the secondary is an overlumi…
Hot stars in the bulge of M31 - Upper limit to the star formation rate
Deharveng, J. M.; Donas, J.; Monnet, G. +1 more
IUE satellite UV observations of the bulge in M 31 indicate upon comparison with previous photometric observations that the far-UV surface brightness distribution is probably similar to that in the B light, despite the discovery of a gradient in (UV-B) color at the very center of this galaxy. While no firm explanation is found for the observed UV …
IUE observations of certain short period RS CVn-like stars
Budding, E.; Gimenez, A.; Kadouri, T. H.
Nine low and one high resolution IUE (LWR) spectrograms for the short period subgroup RS CVn-like stars have been studied, particularly in connection with the MgII 2800 Å feature. Clear emission contributions can be easily seen for some of these stars, while all nine of them appear to have the feature filled by emission to some extent. If surface …
Comparison of winds in the Small Magellanic Cloud and galactic early-type stars.
Bruhweiler, F. C.; Wray, J. D.; Parsons, S. B.
IUE low-resolution spectra of 11 OB stars in the Small Magellanic Cloud reveal considerably lower wind velocities than corresponding galactic stars. The reduced effectiveness of radiative acceleration due to lower abundances of heavy elements in the SMC is believed to be responsible for this effect. The absorption strengths of the SMC P Cygni prof…
The ultraviolet spectrum of the old novae HR Del, GK Per, RR Pic, andRS Oph.
Bianchini, A.; Rafanelli, P.; Rosino, L.
Spectroscopic observations of three old novae and a recurrent nova, all of them at minimum, have been carried out with the IUE satellite. The two slow novae HR Del and RR Pic have similar spectroscopic characters with absorption and emission features of high ionization over a continuum which does not follow a unique power law but seems to be forme…