Search Publications
New observational results of the LMC-S DOR variable R 127 during outburst.
Stahl, O.; Wolf, B.
A study of the long term photometry of the LMC-S Dor variable R 127 indicates that it has had an extremely bright phase in August, 1984. Echelle spectrograph and IUE high dispersion spectra taken during this phase are compared with coude and IUE spectra taken during phases of intermediate brightness in 1982-1985. During the brightest phase, R 127 …
An ultraviolet and optical study of the broad-line radio galaxy 3C 382.
Perez, E.; Fosbury, R. A. E.; Tadhunter, C. N.
Ultraviolet spectra covering 13 separate epochs are presented for the extreme broad-line radio galaxy 3C 382. These show marked variability in both lines and continuum on a time-scale less than about 1 yr. The C IV 1550 A and L-alpha 1216 A lines follow the changes in the ultraviolet continuum but appear to have different profiles, the L-alpha 121…
The High-Resolution Soft X-Ray Spectrum of HZ 43
Heise, J.; Bleeker, J. A. M.; Brinkman, A. C. +2 more
The authors present the high-resolution soft X-ray spectrum in the range 50 - 350 Å of the hot DA white dwarf HZ 43, obtained with the 500 lines mm-1 grating spectrometer on EXOSAT. Most remarkably, the spectrum indicates that the photosphere of HZ 43 consists solely of hydrogen, to a high degree of purity. Using a grid of hot, high-gra…
A study of UV spectra of zeta Aur/VV CEP systems. VIII. Chromospheric ionization and opacity.
Schroeder, K. -P.
Using 25 high resolution IUE spectra of Zeta Aur, 32 Cyg and 31 Cyg taken during chromospheric eclipse, the Fe I/Fe II ionization equilibrium has been determined empirically as Fe I/Fe II of about 10 exp -3.5. Fe is ionized by UV radiation from the B star companion while recombination is controlled by electrons from collisionally ionized hydrogen.…
SW Lacertae, W Ursae Majoris, YY Eridani and the prevalence of starspots in cool contact binaries.
Eaton, J. A.
Detailed light curve analyses have been carried out for three cool contact binaries to determine (1) what makes the larger component appear cooler and (2) how a period change affects the structure of the common envelope.
A multi-wavelength study of the long-period AM HER system E2003+225 -II. Changes in the accretion geometry.
Mukai, K.; Maraschi, L.; van Paradijs, J. +7 more
The longest period AM Her system E2003+225 was observed on 1984 July 24 with IUE, with simultaneous optical spectroscopy and photometry from La Palma. The variations of the overall continuum from 1200 to 5000 Å with orbital phase allow a study of the different spectral components in the system. High-resolution optical spectra show complex line pro…
Detailed analysis of the ISM toward dzeta OPH and 9 Sgr.
Pottasch, S. R.; Pwa, T. H.
Data from high-resolution spectra obtained with the IUE at 115-210 nm and 185-310 nm toward Zeta Oph and 9 Sqr are combined with published laboratory atomic and molecular data and supplementary Copernicus FUV observations to determine the abundances, temperatures, and densities in both H I clouds and the Zeta Oph H II region. The results are prese…
Z Camelopardalis: Outburst P Cygni Profiles and Quiescent Continuum
Szkody, P.; Mateo, M.
The authors present the first orbital study of the C IV P Cygni profile in the dwarf nova Z Cam, a system of intermediate inclination. A modulation of the absorption equivalent width is apparent, with phases suggesting an effect from the mass-transfer stream. Over the outburst cycle, the strength of the P Cygni absorption and emission components i…
IUE Observations of V Sagittae
Corcoran, M. F.; Koch, R. H.; McCluskey, G. E., Jr. +1 more
Observations of the nova-like variable V Sge are discussed, and the ground-based light curve is analyzed, compensating for the component interaction effect. Low-dispersion IUE spectra indicate that interstellar reddening is smaller than suggested from visible-band observations. The UV and visible continuum are modeled by a He-rich model and by a s…
A search for X-ray periodicities from 4U 1700-37.
Stella, L.; White, N. E.; Gottwald, M.
Using the EXOSAT observatory the authors have observed the massive X-ray binary system 4U 1700-37 for more than one complete orbital period. The authors report on a search for X-ray pulsations. No coherent periodicity was detected with upper limits to the pulsed fraction over the frequency range 256 to 2×10-5Hz (corresponding to rotatio…