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The UV variations of the symbiotic star CH Cygni from 1978 to 1981.
Hack, M.; Persic, M.; Selvelli, P. L.
The spectroscopic changes of CH Cygni from early 1978 to late 1981 are discussed with reference to several ultraviolet spectra obtained at the Villafranca Satellite Tracking Station. Correlations have been found to exist between the fluxes of the continuum and the fluxes of the forbidden and semiforbidden lines. Three new forbidden-line identifica…
Evolution of the ultraviolet coma of comet Austin (1982g.)
Feldman, P. D.; Keller, H. U.; A'Hearn, M. F. +6 more
Ultraviolet spectra of comet Austin (1982) obtained in July 1982 at heliocentric distances ranging from 1.10 to 0.81 AU preperihelion with the IUE reveal that the comet is very similar in chemical composition and appearance to comet Bradfield (1979X). In addition, the derived H2O production rate is found to vary with heliocentric distance as r to …
RZ Gru - a UX UMa 'disc star'.
Stickland, D. J.; Kilkenny, D.; Kelly, B. D. +4 more
The star RZ Gruis is confirmed as a cataclysmic variable. Its ultraviolet spectrum suggests that it belongs to the UX UMa subclass in which an optically thick disc is maintained at outburst state; coordinated optical and UV photometry show changes of about one magnitude on a time-scale of months in addition to smaller variations on a scale of minu…
Far-ultraviolet spectra of the nuclei of globular clusters M 30, M 54, M 70.
Wamsteker, W.; Caloi, V.; Castellani, V. +1 more
IUE spectra in the low dispersion mode have been collected from the nuclei of the three galactic globular clusters NGC 6681 (= M70), NGC 6715 (= M54), and NGC 7099 (= M30). High UV fluxes are obtained from M54 which had been found earlier to be a real characteristic of the cluster population, suggesting a possible connection of this cluster with E…
IUE observations of the "Butterfly" nebula M 2-9.
Feibelman, W. A.
IUE observations of the peculiar 'Butterfy' nebula M2-9 indicate that it is not a normal planetary nebula. The ultraviolet spectrum is characterized by few emission lines and a weak continuum. Mg II 2800 A is the strongest emission line present and may be indicative of a binary nucleus. Lines of N v, Q I, N III, N IV, Si III, and C III are seen, b…
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…