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Metal abundances in the hot DA white dwarfs Wolf 1346 and Feige 24.
Wesemael, F.; Henry, R. B. C.; Shipman, H. L.
Photospheric metal lines observed in high-dispersion IUE spectra of the hot DA white dwarfs Wolf 1346 and Feige 24 are analyzed with detailed model synthetic spectra in order to derive metal abundances in the two stars. The IUE images used in the analysis are first discussed together with the theoretical framework, an extensive set of metal line p…
Bolometric corrections for peculiar B-type stars.
Lanz, T.
Semi-empirical bolometric corrections are estimated for 25 peculiar stars and 13 comparison stars from IUE low dispersion spectrum and from theoretical fluxes best fitting the Geneva colour indices. When corrected for reddening, the relation BC vs. (B2-G)0 for main-sequence stars matches fairly well the theoretical relation computed by …
Nebular and interstellar absorption lines in planetary nebulae : the case of NGC 6543.
Pottasch, S. R.; Pwa, T. H.; Mo, J. E.
Using high resolution IUE spectra it is possible to separate the narrow absorption lines due to the interstellar material and the nebular matter. The analysis of nebular absorption lines has three advantages. First the column densities of ions different from those observed in emission can be determined. The abundance of the elements are then readi…
Characteristics of the Fe II and C II emission in high-resolution IUEspectra (2300-3000 A ) of alpha Orionis.
Carpenter, K. G.
A study is presented of Fe II and C II emission features in the 2300-3000 A region of four high-resolution IUE spectra of Alpha Ori obtained during the period 1978 April-1982 November. A set of 42 unmutilated, unblended Fe II lines of multiplets UV 1-3, 32-33, 35-36, and 60-64 and the C II (UV 0.01) intercombination lines have been identified and …
The 1200-3200 A spectra of Seyfert I galaxies : MK 304, NGC 7603, MCG8-11-11, ESO 12-G 21 and NGC 1566.
Clavel, J.; Joly, M.
The 5 Seyfert I galaxies MK 304, NGC 7603, MCG 8-11-11, ESO 12-G 21, and NGC 1566 have been observed with IUE (1200 - 3200 Å). Their UV spectrum is rich in emission lines. A steep rise of the continuum toward shorter wavelengths is observed below ≡2000 Å in 4 of these objects; this excess is interpreted as thermal emission from an accretion disk. …
Ripple correction of high-dispersion IUE spectra: blazing echelles.
Barker, P. K.
An iterative differential correcion technique designed to remove the blaze function of an echelle grating directly from observed spectral data is mathematically defined and applied to high-dispersion images acquired with the International Ultraviolet Explorer. Quantitative measurements of ripple correction accuracy demonstrate that the technique i…
IUE observations of the high-velocity symbiotic star AG Draconis. II.The spectral variations during 1979-1983.
Altamore, A.; Baratta, G. B.; Friedjung, M. +2 more
High quality IUE spectra of AG Dra gathered during 1979-81 were examined in concert with data taken at VILSPA. Visual bursts were detected in 1980 and 1983 and were associated with order of magnitude changes in the UV continuum and emission lines. Variability was persistent in the UV and He II lines after the bursts while the C IV line displayed s…
Quantification of the order overlap problem for IUE high resolution spectra (SWP camera). A correction algorithm.
Bianchi, L.; Bohlin, R. C.
A quantification of the order overlap in IUE high resolution spectra is obtained, for the SWP camera, by comparison of line depths measured in IUE and Copernicus spectra. The amount of order overlap is found to be about 32 percent of the net spectrum at 1150 A, decreasing to zero at about 1400 A, for data extracted with the most recent production …
The abundance of interstellar chlorine in the galaxy.
Bromage, G. E.; Harris, A. W.
The results of a large-scale survey of chlorine abundance in interstellar H I gas are presented. The abundances are derived from measurements of 40 interstellar-absorption-line equivalent widths in far-ultraviolet stellar spectra from the Copernicus and International Ultraviolet Explorer (IUE) satellites. It is found that the relative chlorine abu…
The high-ionization and excited-state interstellar lines in the Carina Nebula : a giant HII region in absorption.
Walborn, N. R.; Heckathorn, J. N.; Hesser, J. E.
The dominant component of the highly ionized and excited-state interstellar species seen in the ultraviolet toward stars within the Carina Nebula has been found to have a heliocentric radial velocity of about -30 km/s. This velocity is known to correspond to the near edge of the expanding H II region, as shown by the double optical nebular emissio…