Search Publications
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…
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…
Alpha Trianguli Australis (K2 II-III) : hybrid or composite ?
Ayres, T. R.
The prototype "hybrid-spectrum" giant, α Trianguli Australis, exhibits a far-ultraviolet continuum which is considerably bluer than would be expected of a star of its optical colors, suggesting the presence of a previously unrecognized companion. If the K type primary is as luminous as indicated by the widths of its Ca II and Hα lines, the compani…
Infrared photometry of Seyfert 1.8 and 1.9 galaxies.
Rudy, R. J.; Rodriguez-Espinosa, J. M.
Infrared photometry is reported from 1.25 to 10 micrometers for 10 Seyfert 1.8 and 1.9 galaxies identified by Osterbrock and his collaborators and drawn originally from the Markarian lists. The three objects whose infrared colors are the most nonstellar in nature are objects whose ultraviolet or optical spectra preclude heavy reddening of either t…
HD 8358 : a new active chromosphere binary.
Ake, T. B.; Bopp, B. W.; Goodrich, B. D. +5 more
The results of an extensive study of the eighth-magnitude G star HD 8358 employing optical photometry and spectroscopy, as well as UV observations with the IUE satellite, are presented. The star is found to be an active chromosphere binary with orbital and photometric period of 0.516 days. It exhibits photometric variability of 0.1-0.2 mg in V, du…
Emission by OD in comets
A'Hearn, M. F.; Schleicher, D. G.; West, R. A.
A calculation has been made of the complete fluorescent equilibrium of OD in sunlight including ultraviolet (A-X) transitions, vibrational and rotational transitions (A-A and X-X), and Lambda-doubling transitions in the X state. The dependence on heliocentric radial velocity is strong. No lines of OD are visible in any cometary spectra taken with …
The resonance lines of B II and Be II in Hg-Mn stars.
Sadakane, K.; Jugaku, J.; Takada-Hidai, M.
The resonance lines of B II and Be II are analyzed in 25 Hg-Mn stars. The B II line is present in nine (36 percent) stars, and the line is absent in the remaining stars. Strengths of the B II and Be II lines are in accordance with the predictions of the diffusion theory for about half the sample stars. Five Hg-Mn stars show the strong B II line an…
Ultraviolet, optical and infrared observations of the intermediate polar TV Columbae.
Szkody, P.; Mateo, M.; Hutchings, J.
Forty-three IUE spectra of the X-ray discovered, triply periodic cataclysmic variable, TV Col are examined. The results show that the UV flux varies with the four-day period discovered by Motch in 1981. By fitting continuum models to the UV and optical fluxes, it is inferred that this modulation corresponds to the periodic heating of a normally 90…