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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 discontinuity near 1600 A in the spectra of DA white dwarfs.
Wegner, G.
Ultraviolet spectroscopic observations of two relatively cool DA white dwarfs, L481 - 60 (= WD 1544 - 37) and BPM 1266 ( = WD 2105 - 82), with the International Ultraviolet Explorer (IUE) satellite show a strong drop in their spectral energy distributions below 1600 A. Published model atmospheres and thier visual spectra suggest that these two sta…
Comments on the ultraviolet spectrum of gamma 2 Velorum.
Sahade, J.; Kondo, Y.; McCluskey, G. E., Jr.
A table of spectral features, including narrow, very broad, and 'photospheric' lines, in the ultraviolet spectrum of the Wolf-Rayet binary gamma(2) Velorum is given together with radial velocities at phase 0.99. The very broad lines display P Cygni profiles. Ten weak absorption features are tentatively assigned to blends of numerous lines of Fe IV…
Line profile variation in delta Orionis A, IOTA Orionis A, and 15 Monocerotis.
Grady, C. A.; Snow, T. P.; Cash, W. C.
The results of a monitoring program with IUE and Einstein are presented for three stars, δ Ori A, ι Ori A, and 15 Mon. Line profile variability is observed in the UV profiles accessible to IUE and the relation between the variation in the different ions suggests that the ionization level is varying in the winds of these stars. This is consistent w…
C IV lambda 1550 emission profiles in IUE spectra of Seyfert 1 galaxies.
Stoner, R.; Ptak, R.
Using observed C IV 1550 A emission-line profiles of type 1 Seyfert galaxies obtained with the International Ultraviolet Explorer, numerical comparisons have been made of the ability of model profiles to fit the observations. It is found that simple two-component models provide better fits to observed profiles than one-component logarithmic models…
The variable component of the NGC 4151 IUE spectrum : evidence foran expanding spherical emission shell.
Stoner, R.; Ptak, R.; Gregory, S.
The profile of the forbidden line of C III (1909) is the same in two pseudo-trailed, low-resolution SWP spectra of the nucleus of the Seyfert galaxy NGC 4151 obtained with the IUE in November 1980 and December 1982, respectively. In the 1980 spectrum, the C III forbidden line profile is also very nearly the same as that of the resonance line C IV …
An analysis by wavelength coincidence statistics of the ultraviolet spectrum of kappa Cancri.
Bord, D. J.; Cowley, C. R.; Chjonacki, G. T.
Wavelength coincidence statistics (WCS) are used in conjunction with laboratory line intensity data and IUE data to study spectra of the Hg-Mn rich star K Cnc. The IUE data included the Fe II, Fe III, Mn II and Mn III lines. Attention was focused on the relative abundances as determined by matching the WCS line intensity spectra generated from lab…
The reflection nebula NGC 1999.
Cardelli, J. A.; Bohm, K. H.
The properties of dust particles in regions of recent star formation often seem to be different from the 'average galactic' dust properties. The present investigation is concerned with a determination of the ratio of nebular intensity to the stellar flux for the system NGC 1999/V380 Ori in the ultraviolet. It is found that the stellar flux curve i…
The ultraviolet variability of early-type supergiants.
Underhill, A. B.
Four early-type supergiants - HD 79186 (B5 Ia), HD 96919 (B9 Ia), HD 105056 (ON9.7 Iae), and HD 148379 (B2 Iae) - have been observed with the low-resolution spectrographs of IUE in the large aperture on 14 days. The behavior of the ultraviolet fluxes with time is studied. The light from all four stars seems to vary. Typically the dispersion about …
Search for discrete gamma-ray sources emitting at energies greater than 10(exp15) eV.
Samorski, M.; Stamm, W.
The data of the extensive air shower experiment at Kiel have been scanned systematically for possible discrete γ-ray sources in the energy range E > 1015 eV and in the declination band δ = 25° - 75°. Photon fluxes for celestial positions with the statistically most significant excesses of showers and 3 σ upper limit photon fluxes for…