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IUE observations of the low-excitation planetary nebula Tc-1.
Feibelman, W. A.
Ultraviolet observations of Tc-1 confirm that the object is a low excitation planetary nebula with a central star of type O7. The nebular spectrum has few emission lines and the P Cygni character of the C IV line remains uncertain. A radial velocity of -95 km/s is found from the semiforbidden C III wavelength 1909 line, and an extinction of 0.22 m…
On the presence of OI lambda 1302 emission in Be stars.
Oegerle, W. R.; Peters, G. J.; Polidan, R. S.
The absence of UV O I emission from Be stars is investigated in terms of a model for a circumstellar disk. Observations of the O I 8446 A transition are shown to produce the UV O I triplet 1302.17, 1304.86, and 1306.02 A, which has not been seen. It is demonstrated that the total scattering optical depth in the circumstellar gas is sufficient to e…
IUE and optical observations of MV LYR at intermediate and low states.
Szkody, P.; Downes, R. A.
Ultraviolet observations of MV Lyrae were obtained with the aid of the International Ultraviolet Explorer (IUE) spacecraft on 1979 December 2 when MV Lyr was at a normal low state and on 1980 December 8. The optical observations were obtained at Kitt Peak, Lick Observatory, and the University of Washington Observatory with various image-tube scann…
The circumstellar extinction of RY Sgr.
Holm, A. V.; Wu, C. -C.; Doherty, L. R.
In 1979-80, ultraviolet spectrophotometry of RY Sgr was obtained by the International Ultraviolet Explorer (IUE) during the star's recovery from its 1977-78 minimum. The wavelength dependence of the extinction of this R Coronae Borealis-type variable was determined by comparison of spectra obtained at different times but with nearly the same pulsa…
Ground based and IUE spectral observations of AU Mon.
Sahade, J.; Ferrer, O. E.
Results of ground-based and IUE spectral observations of the close binary AU Monocerotis made in January 1979, are reported. The ground-based observations made in the spectral regions 3600-4500 and 4900-7200 A show radial velocities and H-alpha emission suggestive of radial outflow from a subgiant component at high velocities, and from a B5 primar…
Ultraviolet spectroscopy of F and G supergiants with the IUE. II. The hot companions of HR 2786 and HR 2859.
Parsons, S. B.
Hot companion stars in two binary systems are analyzed by means of IUE low-dispersion spectra. HR 2859B is found to be a B2 IV or V star, and analysis of ultraviolet to near-infrared photometry indicates the primary to be an early G star only one magnitude brighter in V with a magnitude of -4.0. A third star probably associated with this system wa…
The UV spectrum of the symbiotic binary AR Pav during eclipse egress.
Hutchings, J. B.; Cowley, A. P.
UV observations intended to study the structure of the compact hot object believed to represent the accreting component of the symbiotic binary AR Pavonis as it emerges from eclipse are presented. Measurements in the spectral region 1200-3200 A were made over a period spanning 11 days of the 20-day egress period by the IUE satellite. Light curves …
The IUE spectrum of BD +39 4926.
Saha, A.; Oke, J. B.
IUE spectra of the A- or F-type supergiant BD + 39 deg 4926 have been combined with existing optical data. Comparison with model atmospheres yields an effective temperature of 7750 K, gravity log g of 0.5, and a reddening corresponding to E(B-V) of 0.15. The Mg II wavelength 2800 feature was used to estimate the abundance of Mg(+), and the value o…
Erratum - Ground-Based and IUE Spectral Observations of Au-Monocerotis
Sahade, J.; Ferrer, O. E.
The early-type component in nu.01 Sgr.
Kondo, Y.; McCluskey, G. E.; Wu, C. -C.
Four low-resolution UV spectra of v1 Sgr (cK2) were obtained with the IUE satellite to investigate the nature of the hot component in this object, which was detected in the Astronomical Netherlands Satellite UV photometric data. The IUE results show that the spectral energy distribution of v1 Sgr in the FUV is comparable to that of a B9 star. FUV …