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An Atlas of Ultraviolet Spectra of Star-forming Galaxies
Panagia, N.; Calzetti, D.; Wyse, Rosemary F. G. +2 more
An atlas of ultraviolet spectra of the central regions of 143 spiral, irregular, blue compact, Seyfert 2, and starburst galaxies is produced by combining 387 low-resolution spectra from the IUE data archives. The spectra have been extracted with an optimal algorithm and co-added to produce spectra with the best possible signal-to-noise ratio. Our …
Ultraviolet Spectra of QSOs, BL Lacertae Objects, and Seyfert Galaxies
Turnshek, David A.; Lanzetta, Kenneth M.; Sandoval, Jennifer
Motivated by the possibility of detecting strong absorption features toward extragalactic background objects, we present optimally extracted and co-added IUE spectra of QSOs, BL Lac objects, and Seyfert galaxies. These spectra together with those presented (in a similar work) by Kinney et al. form an essentially complete sample of the SWP, LWP, an…
A Synoptic Study of H alpha Line Profile Variability in the T Tauri Star SU Aurigae
Giampapa, Mark S.; Basri, Gibor S.; Johns, Christopher M. +1 more
We present a catalog of 106 high spectral resolution observations of the H-alpha line profile in the T Tauri star SU Aurigae, obtained during the period from 1986 October through 1990 November. The spectra were acquired during joint synoptic programs to observe selected T Tauri stars using the Hamilton Echelle Spectrometer of the Lick Observatory …
Excitation Rate Coefficients and Line Ratios for the Optical and Ultraviolet Transitions in S II
Cai, Wei; Pradhan, Anil K.
New calculations are reported for electron excitation collision strengths, rate coefficients, transition probabilities, and line ratios for the astrophysically important optical and UV lines in S II. The collision strengths are calculated in the close coupling approximation using the R-matrix method. The present calculations are more extensive tha…
An Improved Ultraviolet Spectral Line List for the Symbiotic Star RR Telescopii
Feibelman, W. A.; Doschek, G. A.
We have remeasured wavelengths and intensities of International Ultraviolet Explorer (IUE) spectra of the symbiotic star, RR Tel. The main work is centered on the long 820 minute exposure high-resolution spectrum obtained on 1983 June 18. The list is intended to serve as a source of improved intensities and wavelengths for the ultraviolet spectrum…
IUE Short-Wavelength High-Dispersion Line List for the Symbiotic Nova RR Telescopii
Aufdenberg, Jason P.
An 820 minute and other long-exposure archival SWP IUE high-dispersion spectra of symbiotic star RR Tel have been combined to form a composite spectrum. In most of these spectra many lines are saturated, but weaker features appear above the continuum. Their wavelengths were measured from the composite spectrum and compared with the line list from …
Extended Variability of the Symbiotic Star AG Draconis
Kafatos, M.; Meier, S. R.; Martin, I.
High and low resolution IUE satellite observations of the symbiotic star AG Draconis covering the period 1979-1989 are presented, and the far-UV spectra are studied. Two extended outburst events are found to have two maxima separated by about 1600 days, a time scale not known to be associated with the star but which is about three times the binary…
Electron Density Diagnostics for Gaseous Nebulae Involving the O IV Intercombination Lines near 1400 Angstrom
Feibelman, W. A.; Keenan, F. P.; Conlon, E. S. +2 more
The Bloom and Pradhan (1992) results on the excitation rates for transitions in O IV matrix are used to derive emission-line ratios near 1400 A, applicable to gaseous nebulae. The results are compared with the values measured from high-resolution spectra obtained by the IUE satellite.
Far-Ultraviolet Stellar Photometry: A Field in Orion
Schmidt, Edward G.; Carruthers, George R.
Far-ultraviolet photometry for 625 objects in Orion is presented. These data were extracted from electrographic camera images obtained during sounding rocket flights in 1975 and 1982. The 1975 images were centered close to the belt of Orion while the 1982 images were centered approximately 9 deg further north. One hundred and fifty stars fell in t…
Model Atmospheres: Tool for Identifying Interstellar Features
Frisch, P. C.; Slojkowski, S. E.; Rodriguez-Bell, T. +1 more
Model atmosphere parameters are derived for 14 early A stars with rotation velocities, from optical spectra, in excess of 80 km/s. The models are compared with IUE observations of the stars in regions where interstellar lines are expected. In general, with the assumption of solar abundances, excellent fits are obtained in regions longward of 2580 …