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An application of the method of wavelength coincidence statistics to the ultraviolet spectrum kap Cnc.
Bord, D. J.; Davidson, J. P.
The method of wavelength coincidence statistics (WCS) is applied to the ultraviolet spectrum of the Hg-Mn star Kappa Cnc. Methodological checks involving searches for the element Mn, Cr, and Fe yield positive results, consistent with previous spectroscopic studies of this star. A search for heavy elements (Z in the range 74-81) in the region 1960-…
Ultraviolet spectra of planetary nebulae. IX. High-dispersion observations of NGC 7662.
Seaton, M. J.; Flower, D. R.; Penn, C. J.
High-dispersion IUE spectra of NGC 7662 have been obtained with exposure times optimized for measurement of the relative strengths of the components of: CIV lambda-lambda 1548, 1551; the forbidden line CIII lambda-lambda 1907, 1909 and the forbidden line Ne IV lambda-lambda 2422, 2424. The CIV ratio (lambda 1548)/(lambda 1551) is expected to be 2.…
The spectra of late-type dwarfs in the near ultraviolet. I. Line identifications.
Beckman, J. E.; Selvelli, P. L.; Crivellari, L.
Spectra from IUE of 6 main sequence and near main sequence stars from classes A5 to G8, between 2700 A and 2900 A wavelength are described. In toto, some 250 absorption lines are identified. Observed differences in those atomic and ionic multiplets present in each spectrum are shown to be due either to the regular progression in spectral class, or…
Hot wind from gam2 Vel observed in the ultraviolet.
Feibelman, W. A.; Kondo, Y.; West, D. K.
The close binary system Gamma(2) Vel, consisting of a WC8 and an O9 I star, has been observed in the ultraviolet at various phases. Preliminary analysis of selected data shows that the temperature of the stellar wind from this binary increases outward. This suggests that an additional source of energy other than radiation pressure may exist for th…
IUE observations of quasars 3C 249.1 and 3C 232
Dultzin-Hacyan, D.; Daltabuit, E.; Salas, L.
Spectra of quasars 3C 249.1 and 3C 232 (TON 469) were obtained with the International Ultraviolet Explorer Satellite. In 3C 232 the Lyman series is observed up to Lyman delta and two hydrogen ionizing lines shortward of Lyman delta are observed. The possibility of identifying weak Fe II features is pointed out. Emissions at 1116, 1146, 1166, and 1…
IUE dispersion spectra of luminous stars in symmetric nebulae.
Johnson, H. M.
The objects are + 60 deg 2522 in NGC 7635, Sigma Ori AB and Sigma Ori E centered in a faint elliptical nebula, and AG Car in its nebula. Definite spectra are identified and classified according to photospheric, P Cygni, or interstellar types. Estimates of equivalent width or FWHM are included in the tables. Velocities are given and discussed. The …
Ultraviolet Observations of the Hydrogen Deficient Variable Star Mv-Sagittarii
Nandy, K.; Rao, N. K.
IUE observations of the hydrogen-deficient irregular variable star MV Sgr obtained in 1980 June-October and also in 1979 November are discussed. These observations show a prominent λ 2200 absorption feature. A value ofE(B — V) = 0.55 is deduced from the strength of λ 2200 band assuming that this absorption is caused by interstellar medium. The der…
Ultraviolet extinction towards far OB associations.
Perinotto, M.; Aiello, S.; Barsella, B. +2 more
Stars in the Aur OB-2 and Sco OB-1 associations, located in the direction of the galactic anticenter and center, respectively, have been observed for interstellar extinction. No effects due to changes of grain composition across such large distances are seen. A star exhibiting a peculiar extinction is found in each association. The properties of t…
Integrated Fluxes for Emission Lines in the Ultraviolet Spectra of Several Planetary Nebulae
Carpenter, K. G.; Czyzak, S. J.
The IUE satellite observatory has been used to obtain absolutely-calibrated emission line fluxes for diagnostic lines of multiply-ionized C, N, O, Si, Ne, and Ar which occur in the ultraviolet spectral region of planetary nebulae. These data, when combined with data from the blue, visual, and near infrared, will provide improved estimates of ionic…
IUE observations of variability and differences in the UV spectra of double quasar 0957+561 a, b.
Wilson, R.; Gondhalekar, P. M.
The continuum flux from 2500-2800 A and the emission flux in the Lyman alpha line were observed to change substantially in component A of the double quasar but not in component B. The equivalent width of the line increased by 50 percent in A but not in B, which was probably not due to instrument effects. It was expected that these changes should r…