Search Publications
IUE observations of extragalactic objects
Tarenghi, M.; Gull, T. R.; Boksenberg, A. +23 more
During the commissioning phase of IUE several extragalactic objects were observed spectrally at low dispersion in the UV range lambda lambda 1150-3200: the Seyfert galaxies NGC4151 and NGC1068, the QSO 3C273, the BL Lacertae object B2 1101+38, the giant elliptical galaxy M87 and the spiral galaxy M81. The results obtained are presented and a preli…
IUE observations of hot stars : HZ 43, BD +75 325, NGC 6826, SS Cyg, eta Car.
Boksenberg, A.; Wilson, R.; Underhill, A. B. +15 more
During the commissioning phase of IUE observations were made of a selection of hot stars: the white dwarf HZ43, the hot subdwarf BD +75 deg 325, the nucleus of the planetary nebula NGC 6826, the dwarf nova SS Cygni, and the peculiar object Eta Carinae. The observations were made in the low dispersion mode and the data have been reduced using a pre…
IUE observations of cool stars : alf Aur, HR 1099, lam and EPS Eri.
Jordan, C.; Wilson, R.; Linsky, J. L. +13 more
Initial IUE observations of four cool stars are reported. Observed fluxes and surface fluxes are given for several UV emission lines in the spectral range 1175-2000 A, obtained at low and high dispersion with the short-wavelength spectrograph and camera. These lines are formed in the outer atmospheres of these stars, in regions presumably analogou…
IUE observations of X-ray sources : HD 153919 (4U 1700-37), HDE 226868(Cyg X-1), HZ HER (Her X-1).
Davis, R. J.; Raymond, J. C.; Kondo, Y. +17 more
The first UV spectroscopic measurements of binary X-ray sources with IUE show highly variable emission from a photoionized plasma in the object HZ Her, and give evidence for localized circumsystem material in the binary source Cygnus X-1. In addition, a substantial stellar wind is found in one of the brightest identified X-ray sources HD153919. Th…
IUE observations of the interstellar medium.
Savage, B. D.; Boksenberg, A.; Snijders, M. A. J. +13 more
Results from a preliminary study of interstellar absorption lines in the spectra of the three stars HD149757, HD93521 and HD153919, observed by the IUE during its commissioning phase are presented. They demonstrate the capabilities of the IUE for interstellar research. Results from a preliminary study of the emission line spectrum of the planetary…
Hard X-ray observations of cosmic γ-ray sources
Coe, M. J.; Quenby, J. J.; Engel, A. R.
THE publication1, by workers using the COS B satellite, of a list of 13 discrete cosmic γ-ray sources has aroused considerable interest. Attention has mainly been focussed on attempts to identify all or some of these sources with known X-ray sources2-4, optical sources5,6, radio sources7 and HII regions<…
Possible X-ray counterparts of gamma-ray sources.
Maraschi, L.; Bradt, H.; Apparao, K. M. V. +5 more
The results are presented of a survey regarding the X-ray source positions which fall within the error boxes of 10 unidentified gamma-ray sources observed with the aid of the COS-B satellite. In three cases, including CG 135-1, CG 312-1, and CG 327-0, an X-ray source was found within the gamma-ray error box. However, because of the large uncertain…
Observability of gamma-ray pulsars.
Massaro, E.; Buccheri, R.; Scarsi, L. +1 more
Attention is given to the Crab (PSR 0531 plus 21) and Vela (PSR 0833 minus 45) pulsars in a study of pulsed energy release in the gamma-ray channel; with a gamma-ray/radio luminosity ratio on the order of one million. SAS 2 and COS B data are analyzed in an attempt to detect possible gamma-ray emission from other known radio pulsars. A phenomenolo…
IUE observations of solar system objects
Gull, T. R.; Moos, H. W.; Wilson, R. +16 more
During the scientific commissioning phase of IUE several spectra were acquired from objects residing in the Solar System. The activities focused on testing numerous parameters which would indicate the usefulness of IUE for planetary science. It seems that IUE can successfully tackle many important questions and the data analysis and interpretation…
Coincidence of compact supernova remnants with three COS-B γ-ray sources
Lamb, R. C.
POSITIONAL coincidences and a `near miss' of four small-diameter supernova remnants (SNR) with three of the 11 unidentified COS-B γ-ray sources1 are reported here. I argue that it is unlikely that all four SNR-γ-ray source associations are accidental, and that their compactness probably indicates that their ages are not greater than abo…