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The ultraviolet spectrum of a strongly reddened, high-excitation Herbig-Haro object.
Bohm-Vitense, E.; Bohm, K. H.
Short- and long-wavelength IUE spectra of the rather strongly reddened, high radial velocity Herbig-Haro object HH 32A have been obtained. The object is well known for its large positive radial velocity and for its unusually large velocity dispersion. In consequence of the large ultraviolet extinction, the spectra are faint. The semiforbidden C II…
The spectrum of the Be star HD 110432.
de Freitas Pacheco, J. A.; Codina, S. J.; Lopes, D. F. +1 more
The UV spectrum of HD 110432, a B0.5IIIe star, is described. The IUE spectra present broad absorption photospheric lines, very narrow absorption lines of interstellar origin and narrow absorption lines of highly ionized species (N V, C IV, and Si IV) displaced to the short wavelengths at velocities of about -1350 km s-1. The authors hav…
Ultraviolet observations of the peculiar supernova remnant in NGC 4449.
Gull, T. R.; Raymond, J. C.; Fesen, R. A. +1 more
IUE spectra were obtained of the emission region in the irregular galaxy NGC 4449 that has been identified as a young, oxygen-rich supernova remnant embedded in an H II region. The spectra show a blue continuum with a strong C IV 1550 P Cygni feature. Comparison to spectral standard stars observed with IUE shows similarities to O3-O7 V and early B…
The stellar population of the nucleus of M 33 from an analysis of itslambda-lambda 1200-3000 A spectrum.
Benvenuti, P.; Dodorico, S.; Ciani, A.
The λλ1200 - 3000 Å spectrum of the nucleus of M33 is used in conjunction with U, B, V photometry as input to a linear programming method to determine the stellar population of the system. No astrophysical constraints but modifications in the stellar library (which includes Population II objects) were used to explore different evolutionary histori…
Main-sequence B stars with strong winds in the core of NGC 6231.
Savage, B. D.; Massa, D.; Cassinelli, J. P.
Low-dispersion IUE observations of 13 main sequence B0 - 2 stars in the Sco OB1 association are presented. Eleven of these are in the rich open cluster NGC 6231. Most of the NGC 6231 stars have strong UV resonance lines which are inconsistent with either their spectral types or the rest of their UV spectra. A high-dispersion IUE spectrum of one of…
Detection of diffuse LY alpha emission from cD galaxy in Abell 1795.
Norgaard-Nielsen, H. U.; Jorgensen, H. E.; Hansen, L.
The authors report the discovery of diffuse Lyα emission from the cD galaxy in Abell 1795 which has a high X-ray derived mass accretion rate. The Lyα emission coincides with the main optical filamentary structures and the Lyα/Hβ ratio is close to the recombination v…
Mass loss from the central star of NGC 3242.
Pottasch, S. R.; Hamann, W. -R.; Kudritzki, R. -P. +1 more
The central star of NGC 3242, which was classified to be of "continuous type" before Kudritzki et al. (1981) discovered and analysed photospheric absorptions, has been observed with IUE in high resolution. The N V resonance doublet exhibits a weak P Cygni profile with photospheric components. Theoretical profiles are obtained from comoving-frame c…
Changes in the ultraviolet spectrum of EG Andromedae.
Stencel, R. E.
Ultraviolet observations of EG Andromedae, a symbiotic star, are reported which clearly show pronounced eclipse-like effects on the high-temperature far-UV continuum. Continuum and emission-line variations with phase are reported and related to synoptic hydrogen alpha data. System parameters are characterized.
The central star of the planetary nebula Abell 78.
Feibelman, W. A.; Kaler, J. B.
The authors have studied the ultraviolet spectrum of the nucleus of Abell 78, one of the two planetaries known to contain zones of nearly pure helium. Abell 78 is strikingly similar in many respects to Abell 30, the other planetary with embedded helium knots. The ultraviolet-optical color temperature, which the authors tentatively identify with th…
Blueshifted narrow absorption components in the ultraviolet spectrum of the binary V861 SCO (HD 152667).
Howarth, I. D.
Blueshifted narrow absorption lines have been studied in 14 high resolution IUE spectra of the B0 Ia+B2 V binary V861 Sco. The column densities of C II ions producing the λ1335 P Cygni feature and narrow absorptions have been estimated by profile fitting and velocities measured with respect to interstellar lines. The narrow absorption lines have a…