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Infrared, optical and ultraviolet observations of TT Ari.
Jameson, R. F.; King, A. R.; Sherrington, M. R.
B, V, J and K light curves together with the IUE ultraviolet spectrum of the cataclysmic variable TT Arietis are presented. The interpretation of these data leads to a system distance of 100 pc and outer disc temperature of 11,000-12,500 K.
Discrete sources of cosmic gamma rays
Wolfendale, A. W.; Li, T. P.
The possibility is considered that some unidentified gamma-ray sources are in fact not discrete sources but rather 'apparent sources' caused by cosmic-ray irradiation of the clumpy interstellar medium. It is shown that six of nine unidentified gamma-ray sources in the 2CG catalog can be explained in terms of the mechanism considered and that the s…
IUE observations of UV absorption in the spectrum of the C2 white dwarf L 1363-3.
Koester, D.; Weidemann, V.; Vauclair, G.
Strong ultraviolet absorption features have been observed in a short wavelength IUE spectrum of the weak carbon white dwarf L1363-3. The spectrum is quite similar to those obtained for the weak C2 white dwarf L145-141 and the DC white dwarf G33-49 and shows strong absorption at 1920 A and between 1520 A and 1680A. Identification with carbon absorp…
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…