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Ultraviolet shell formation at V1016 Cygni.
Feibelman, W. A.
A recent 330 minute high-resolution International Ultraviolet Explorer (IUE) spectrogram of V1016 Cygni shows splitting of the 1550 A component of the C IV resonance doublet, suggesting that a nebular shell is in the process of formation. An expansion velocity of 15 km/s is indicated by the IUE data and corresponds to the low range encountered wit…
Appendix - Empirical Estimates of Noise Levels in IUE Low-Dispersion Spectra
Ayres, T. R.
Ultraviolet spectra of the X-ray transient A 0538-66.
Raymond, J. C.
Ultraviolet spectra were obtained before and after the optical spectrum changed from absorption to emission lines. The continuum brightness dropped by a factor of 2. Spectra with bright continua show N V, Si IV, and C IV in absorption, while the spectrum with fainter continuum has these lines in emission. The emission lines of N V and Si IV are an…
Low-resolution MG II H and K observations of solar type stars.
Barry, D. C.; Schoolman, S. A.
Observations with the International Ultraviolet Explorer (IUE) have made possible a comparison between chromospheric radiative loss rates in the Mg II h and k lines and the Ca II H and K lines. Observations made by Stencel et al. (1980) confirm the findings of Linsky et al. (1979) that the chromospheric radiative loss rates in h and k and H and K …
The thermonuclear model for X-ray transients.
Woosley, S. E.; Weaver, T. A.; Wallace, R. K.
Second COS-B catalogue of high-energy gamma-ray sources.
Bignami, G. F.; Hermsen, W.; Masnou, J. L. +11 more
A list of 25 high-energy (greater than 100 MeV) gamma-ray sources detected by COS B is presented. Only four sources are identified with well-known objects. Of the remaining sources, 20 are at low galactic latitude, and they may represent a new galactic population. Their luminosity is estimated to be in the range of (0.4-5) x 10 to the 36th ergs/se…
Ultraviolet absorption by interstellar gas at large distances from the galactic plane.
Savage, B. D.; de Boer, K. S.
Eighteen high-dispersion IUE spectra of six stars in the Large Magellanic Cloud, three stars in the Small Magellanic Cloud, and two foreground stars were analyzed. Fourteen spectra cover the wavelengths 1150-2000 A, and four cover 1900-3200 A; the velocity resolution is about 25 km/s. All the Magellanic Cloud spectra exhibit very strong interstell…
Mass loss from very luminous OB stars and the CYG superbubble.
Churchwell, E.; Abbott, D. C.; Bieging, J. H.
A description is presented of radio continuum measurements of mass loss from OB stars made at a wavelength of 6 cm with the Very Large Array (VLA). Five of the six most luminous members of the stellar association Cyg OB2 were detected. The considered investigation concentrates on the most luminous stars known in the Galaxy. The stars were selected…
Outer atmospheres of cool stars. IX. A survey of ultraviolet emission from F-K dwarfs and giants with the IUE.
Linsky, J. L.; Ayres, T. R.; Marstad, N. C.
Low-dispersion ultraviolet spectra (1150-2000 A) of a representative sample of cool stars, including dwarfs and giants of spectral types F-K, obtained with the IUE, are examined. The observation and the absolute calibration procedures are described. Correlation diagrams are constructed that compare chromospheric and transition-region emission line…
The FK COM stars.
Stencel, R. E.; Bopp, B. W.
The paper presents IUE observations of three very rapidly rotating G-K giants (v sin i = 100 km/s). The UV spectra show strong chromospheric and transition region emission lines similar to (and in excess of) the RS CVn binaries. These stars show no evidence for radial velocity variations in excess of plus or minus 3 to plus or minus 20 km/s, argui…