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Simultaneous IUE and ground-based observations of V923 Aquilae.
Ringuelet, A. E.; Rovira, M.; Sahade, J. +2 more
Simultaneous IUE and ground-based observations of V 923 Aquilae carried out in July 1981 are used to propose a model of the extended envelope of this Be star with a transition region relatively close to the star, where the highly ionized species would be formed. The shell photographic and ultraviolet lines of Fe II and the photographic lines of Ca…
IUE observations of RS CVn-like binary sigma Corona Borealis.
Tarafdar, S. P.; Agrawal, P. C.
High and low resolution IUE observations of the triple system sigma CrB are presented. The spectra show the presencee of chromospheric (O I, Si II, Mg II) and transition region lines (He II, C II, C IV) in emission. The surface fluxes of these lines are orders of magnitude higher than those observed in the sun but are comparable to their values in…
Anomalous C IV and SI IV resonance lines in 36 Lyncis.
Sadakane, K.
Anomalously strong resonance lines of C IV and Si IV are found in the UV spectrum of the chemically peculiar star 36 Lyncis. The C IV resonance lines near 1550 Å are not found in about 40 other middle or late B-type main-sequence stars. The C IV lines (Wλ ≡ 1.0 Å) are stronger than the Si IV lines (Wλ ≡ 0.7 Å) in 36 Lyn and s…
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…
The C/O abundance ratio in the planetary nebula IC 2501.
Adams, S.; Goharji, A.
The detection of a silicon carbide feature in the infrared spectrum of the planetary nebula IC 2501 suggests that the nebular envelope is carbon rich (Aitken and Roche 1982). The authors have observed IC 2501 with the IUE satellite and have combined these observations with optical measurements in order to analyse the physical conditions and abunda…
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…
On the reality of the 2800 A interstellar absorption feature attributed to proteins
Nandy, K.; McLachlan, A.
A hot companion to MU Sagittarii : an opportunity to sound the atmosphere of a B8 IA supergiant.
Plavec, M. J.; Polidan, R. S.
It is argued that the bright supergiant star Mu Sagittarii is accompanied by a smaller and hotter star, of spectral type approximately B1.5 V. The single-line radial-velocity curve of the B8 star leads to a fairly large mass function, f(m) = 2.64 solar masses, implying that the companion should have at least 50 percent of the mass of the visible s…