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The spectra of late-type dwarfs and sub-dwarfs in the near ultraviolet. III. an atlas of MG II H and K profiles.
Molaro, P.; Franco, M. L.; Beckman, J. E. +5 more
Using a radically new suite of data extraction routines, IUEARM, high resolution IUE spectra of six F and G stars, taken at regular intervals since 1978 are analysed. The salient features of the new routines are: reduction of interorder scattering via two-dimensional deconvolution of the echelle spectrograph image plane, with high frequency filter…
Discovery of a white dwarf companion of the "hybrid" K giant HD 81817.
Reimers, D.
IUE observations show that the bright K giant HD 81817 has a faint blue companion which is identified as a white dwarf. A fit of theoretical DA model atmosphere fluxes to the observed energy distribution in the wavelength range λλ1250 Å to 1600 Å yields an effective temperature Te = 20000±2000K for the WD companion and places the WD at …
Ultraviolet observations of the Be star MU Centauri during its recentactive phase.
Peters, G. J.
IUE and Copernicus ultraviolet observations and ground-based image-tube and direct spectrograms of the pole-on Be star Mu Cen have been combined to investigate the nature of this star's activity during its Balmer emission-line episode of 1980-81. Within the uncertainties of the observations, the UV data show no evidence for a wind, a classical-typ…
Variable ultraviolet emission in SY Muscae.
Kafatos, M.; Michalitsianos, A. G.
The results of continued IUE monitoring of the symbiotic variable SY Muscae, following an earlier report of a radical enhancement in UV emission from the star, are reported. Over the course of one year, the prominent emission lines of N V, O V, C IV, and He II appear to be gradually decreasing in absolute intensity. This appears to coincide with a…
The S201 far-ultraviolet imaging survey. III. A field in Sagttarius.
Page, T.; Carruthers, G. R.
Far-ultraviolet imagery of a 20 deg diameter field in Sagittarius, centered near (1950) R.A. 18 h 34 m, decl. -30 deg 25 arcmin, was obtained by the S201 far-ultraviolet camera during the Apollo 16 mission. In a 10-minute exposure covering the 1250-1600 A wavelength range, 1034 star images are detectable, with a limiting ultraviolet magnitude of a…
The masses of early-type stars in the galactic halo determined from ultraviolet resonance line profiles.
Dufton, P. L.; Keenan, F. P.
Terminal velocities for stellar winds in intermediate and high galactic latitude OB stars have been determined from high resolution IUE ultraviolet spectra. These velocities, together with previous estimates, have been used to deduce stellar masses which are found to be similar to those derived from conservative and non-conservative evolutionary t…
Ultraviolet analysis of the peculiar supergiant HD 112374 = HR 4912.
Bohm-Vitense, E.; Proffitt, C.
The ultraviolet energy distribution of the metal-poor supergiant HD 112374 is analyzed based on observations from the International Ultraviolet Explorer (IUE) satellite for the region between 1200 and 2000 A. A discontinuity was found in the UV spectra at 2600 A which confirmed the low-abundance of heavy elements found by Luck et al. (1983). Value…
NGC 3448 revisited : a combined optical, radio and UV investigation.
Casini, C.; Bertola, F.; Bettoni, D. +3 more
The present combined optical, radio, and UV observations are of the irregular galaxy NGC 3448. It interacts with a smaller spiral companion, UGC 6016, forming the peculiar system Arp 205. Rotation curves were constructed from the red lines of a KPNO spectrum and from VLA H I observations. Abnormal velocity features were detected, and are attribute…
Variable, optically thick, hot plasma observed in interacting binaries
Kondo, Y.; McCluskey, G. E.; Parsons, S. B.
We report recent International Ultraviolet Explorer (IUE) observations of two interacting binaries, R Arae and HD 207739. The ultraviolet spectra indicate the presence of optically-thick, variable hot plasma in those binary systems. These two binaries may belong to a class of binaries that are currently undergoing a rarely observed and probably sh…
Far and extreme-ultraviolet spectrophotometry of hot white dwarfs : prospects for the determination of the He/H ratio in DA stars.
Wesemael, F.; Green, R. F.; Liebert, J.
The various spectroscopic methods currently available to determine the He/H ratio in hot DA white dwarfs are compared and contrasted. The observation of the optical He II λ4686 line, as well as that of the λ1640 line with the low-dispersion IUE camera, can only be wsed to determine the helium abundance for log (He/H) > -3. Low-resolution (λ/Δλ …