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A study of depletions within the rho Ophiuchi cloud based on IUE observations of HD 147889.
Joseph, C. L.; Snow, T. P.
Archival IUE data on the deeply embedded Rho Oph cloud star HD 147889 have been used to derive column densities for several species. The poor data quality and limited useful spectral coverage made unambiguous abundances very difficult to deduce, but firm limits could be set. Absolute depletions have been estimated, based on an assumed value of the…
Ultraviolet and X-ray observations of NGC 2264.
Simon, T.; Snow, T. P., Jr.; Cash, W.
Pre-main-sequence stars in the galactic cluster NGC 2264 were observed with the IUE to search for ultraviolet chromospheric and transition region emission lines and with the Einstein Observatory to search for coronal X-ray emission. Fifteen cluster members (and four other stars) of spectral type B - K, ranging in age from 106 to 10…
Discovery of a cataclysmic variable type companion of the M3 III giant 4 DRA with IUE.
Reimers, D.
IUE observations show that the bright (mv∼5) normal M 3 III giant 4 Dra has a blue companion. Its spectrum increases to shorter wavelengths in the IUE short wavelength region and has strong emission lines of high excitation (CIV, NV, CIII, HeII, ...) superimposed. The spectrum of the companion of 4 Dra bears similarity to UV spectra of …
HD 87643 : a B E star with a cold wind.
Selvelli, P. L.; de Freitas Pacheco, J. A.; Faria Lopes, D. +1 more
Ultraviolet observations of the B/e/ star HD 87643 have revealed the presence of a wind in low ionization species with outflow velocities of up to 800 km/s in the Mg II doublet. The dominating species in the spectrum are the once-ionized metals, mostly Fe II. The P Cyg profiles of the Mg II lines have a structure similar to that of the Balmer line…
The First Ultraviolet Studies of the Optical Candidate for the X-Ray Source 1118-61
Coe, M. J.; Payne, B. J.
The X-ray pulsator, 1118-61, discovered in 1975 by the Ariel-5 satellite, has been observed for the first time at UV wavelengths using IUE. Its UV spectrum clearly identifies the optical counterpart as a Be star similar to that seen in other X-ray pulsators. From the 2200 Å absorption feature a distance estimate of ∼ 4 kpc is obtained and the carb…
IUE observations of a starburst disk and the detectability of high redshift galaxies.
Huenemoerder, D. P.; Weedman, D. W.
The high-surface-brightness inner disk of NGC 1068 has been observed with the IUE to determine the ultraviolet spectrum and surface brightness profile. This disk is explained by an intense starburst, requiring formation of 1-2 massive stars/yr, so it is a good prototype for seeking at early epochs in the universe. Calculations of isophotal diamete…
Ultraviolet interstellar absorption toward stars in the Small Magellanic Cloud. IV. Highly ionized gas associated with the Small Magellanic Cloud.
Savage, B. D.; Fitzpatrick, E. L.
High-dispersion International Ultraviolet Explorer satellite spectra of seven stars in the Small Magellanic Cloud (SMC) are examined to study the properties of interstellar C IV and Si IV absorption in the SMC. Absorption by C IV or Si IV or both is found near 160 km/s for all the stars. The velocity and the relative C IV and Si IV strengths sugge…
The 2200 A circumstellar dust absorption feature in the spectra of three bright RV Tauri stars.
Cardelli, J. A.; Baird, S. R.
IUE observations of the 2200 A absorption feature of circumstellar dust were made of the three RV Tauri stars AC Her, U Mon, and R Sct. U Mon was found to have a dust shell with a much lower column density at 2200 A than R Sct and possibly AC Her, requiring U Mon to have a much more extended dust shell than R Sct to account for its greater infrare…
Temporal Intensity Fluctuations of HERCULES-X-1 around 100-SECOND Timescales
Pietsch, W.; Kahabka, P.; Truemper, J. +2 more
Her X-1 has been observed with EXOSAT for one 35d cycle between March 1 and April 5, 1984 at about 4 day intervals. During three observations, absorption dips were encountered showing fluctuations with time scales in the several hundred seconds range. The data are interpreted with a model where random superposition of absorbing blobs or…
Simultaneous ultraviolet and optical observations of FK Comae.
Grewing, M.; Bianchi, L.; Kappelmann, N.
The authors report simultaneous photometric and spectroscopic observations of FK Comae. Photometric measurements were made in the UBVR system, and in two bands centered near Hα and Hβ, respectively. The spectroscopic measurements were obtained with the IUE satellite in the 1150 - 3200 Å band near phases 0 and 0.5, in order to distinguish between t…