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NGC 7714 - The prototype star-burst galactic nucleus
Sramek, R. A.; Weedman, D. W.; Feldman, F. R. +3 more
New X-ray, ultraviolet (IUE), optical, and radio (VLA) observations are presented for the bright nucleus galaxy NGC 7714. All data are explainable as resulting from intense star-formation activity in this nucleus - a star burst. The X-ray and radio luminosities are explained by supernova remnants arising from the massive stars, and approximately 1…
Mass loss rates from O stars in OB associations.
Conti, P. S.; Garmany, C. D.; Olson, G. L. +1 more
The considered investigation is concerned with an extension of an analysis of the spectra of 31 O type stars observed with the International Ultraviolet Explorer (IUE) satellite to include excited as well as resonant lines. The investigation makes use of the methods developed by Olson (1981). Most of the stars are unevolved cluster members, a grou…
Evidence for sulphur implantation in Europa's UV absorption band
Matson, D. L.; Nelson, R. M.; Lane, A. L.
The International Ultraviolet Explorer (IUE) spacecraft has obtained observations of the galilean satellites over the past 2 years which fortuitously span the periods of the Voyager encounters with the jovian system. Our IUE observing programme is designed to determine the UV spectral characteristics of the galilean satellites as a function of orb…
Star formation and extinction in extragalactic H II regions.
Kunth, D.; Deharveng, J. M.; Lequeux, J. +1 more
Evolutionary models are presented of far UV luminosity, production of ionizing photons, effective temperature, and ejection of heavy elements for an ionizing star cluster. The way in which interstellar extinction in our Galaxy and inside and outside the H II region affects the UV and optical emission of the complex is discussed. Conclusions are de…
Spectroscopy of the unique degenerate binary star LS I +61 303.
Hutchings, J. B.; Crampton, D.
IUE ultraviolet, and ground-based spectroscopic data are presented and discussed. The primary is a rapidly rotating B0 main-sequence star, with a stable shell. The radial velocities indicate binary motion in a 26.5-day orbit (in agreement with the radio flaring period), with a secondary of mass 1.1-1.5 solar masses. The broad Balmer emission appea…
Interstellar extinction in the Large Magellanic Cloud.
Nandy, K.; Willis, A. J.; Wilson, R. +2 more
Interstellar extinction in the ultraviolet as a function of position in the Large Magellanic Cloud (LMC) is investigated using an enlarged sample of reddened and comparison stars. With the exception of SK-68-108, the extinction curves of the LMC stars do not show significant variation. The mean extinction curve increases towards 2200 A, with some …
Ultraviolet stars in the Orion Nebula and toward HD 147889.
Savage, B. D.; Bohlin, R. C.
The International Ultraviolet Explorer (IUE) was used to obtain low resolution absolute ultraviolet energy distributions for the four Trapezium stars Theta(1) Orionis A, B, C, and D, Theta(2) Orionis A and B, HD 147889, and several unreddened standard stars. The observations for Theta(1) Orionis B reveal a peculiar extended object. The measurement…
3C 273 revisited : confirmation by COS-B of high energy gamma-ray emission.
Caraveo, P. A.; Bignami, G. F.; Hermsen, W. +11 more
The results of a second observation in the Virgo region by the ESA COS-B satellite are presented. The presence of a high- energy (50-800 MeV) gamma-radiation source is confirmed, and its position is consistent with 3C273. The error box at the 90% confidence level containing the quasar is ∼2.5 square degrees, and the probability of a chance coincid…
Ultraviolet interstellar extinction in the Large Magellanic Cloud using observations with the international ultraviolet explorer.
Koornneef, J.; Code, A. D.
Ten early-type supergiants in the Large Magellanic Cloud (LMC) have been observed with the International Ultraviolet Explorer (IUE). The spectra (1150-3200 A) are shown, and their photometric properties are discussed. It is confirmed that the LMC interstellar extinction law for these stars deviates significantly from the average galactic law in th…
Central Object of the 30 Doradus Nebula, a Supermassive Star
Savage, B. D.; Cassinelli, J. P.; Mathis, J. S.
R136 (HD 38268) is the central object of the 30 Doradus Nebula, a giant region of ionized hydrogen in the Large Magellanic Cloud. Observations of R136 at low and high spectral resolution with the International Ultraviolet Explorer reveal a peculiar hot object with a massive stellar wind. An outflow speed of 3500 kilometers per second and a tempera…