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Far UV radiation in cataclysmic variables.
Drechsel, H.; Rahe, J.; Wargau, W.
The absolute continuum flux distributions in the far UV region of nine cataclysmic systems exhibit considerable excess radiation over the fluxes expected from steady-state optically thick accretion disk models. The UV continua can alternatively be interpreted as superposition of two blackbody sources: a hot (0.5 - 2×105K) component orig…
The galactic gamma-ray source population
Godfrey, C. P.
A procedure has been developed to estimate the contribution to the galactic gamma-ray emission by discrete sources under the assumption that the sources are distributed spatially like the total emission, but without regard to the nature of the individual sources. In particular, an analytical method is developed for calculating the fraction of the …
Helium cyclotron emission from accreting magnetized neutron stars.
Chitre, S. M.; Apparao, K. M. V.
The authors find that helium nuclei accreting onto magnetized neutron stars in strong X-ray sources can emit cyclotron radiation. In the case of the X-ray source 4U 0115+63, the He cyclotron line at 6 eV in the ultraviolet should be observable with the IUE satellite.
Erratum: "A multiwavelength comparison of Cassiopeia A and Tycho's supernova remnant" [Astrophys. J., Vol. 257, 145 - 150 (1982)].
Murray, S. S.; Dickel, J. R.; Morris, J. +1 more
COS-B upper limits on gamma-ray emission from radio pulsars.
Caraveo, P. A.; Bignami, G. F.; Strong, A. W. +13 more
The authors report on the results of a search for pulsed gamma-ray emission from old radio pulsars in the COS-B data in the energy range 50 MeV to 2 GeV. The analysis has been done by using either pulsar parameters obtained in simultaneous radio and gamma-ray observations or parameters which could be reliably derived by interpolation from radio ob…
Ultraviolet Variability of HD62001 - the Central Star of the Missing Nebula VORONTSOV-VELYAMINOV1-7
Rao, N. K.; Gilra, D. P.
IUE observations of HD 62001 do not confirm the ultraviolet variability of 0.15 mag seen from the ANS observations. These intriguing variations in ANS observations seem to be caused by a nearby (∼ 70 arcsec away) B star getting in and out of the field of view of the telescope, which had a jitter of 20 arcsec. There seems to be no evidence for the …
The Use of Gamma-Rays to Trace the Local Interstellar Hydrogen
Strong, A. W.
COS-B data in the latitude range 11° <¦b¦ < 19° show the gamma-ray intensity to be closely correlated with the total line-of-sight absorption derived from galaxy counts. It is found that to a good approximation the gamma-ray intensity is proportional to the total gas column density, and on this basis a map of the angular distribution of loca…
The carbon abundance in the Magellanic Clouds from IUE observations.
Dufour, R. J.; Shields, G. A.; Talbot, R. J., Jr.
Results are given of observations of the UV spectra of several H II regions in the Magellanic Clouds, with emphasis on obtaining the carbon abundance from the UV lines of C II, C III, and C IV. The observations and results are described, and theoretical model calculations are presented of the H II regions and the relative abundances of H, He, C, N…
Large-scale distribution of galactic gamma radiation observed by COS-B
Caraveo, P. A.; Bignami, G. F.; Hermsen, W. +13 more
A complete survey of the Galaxy in high-energy gamma rays was performed aboard the ESA satellite COS-B. Gamma-ray maps were derived for energy ranges between 70 MeV and 5 GeV from 1975-1979, and are presented as both contour maps and as longitude and latitude profiles for three energy intervals. The spectral ratio is derived in the form of a color…
Ultraviolet spectra of planetary nebulae. 6 NGC 7662.
Harrington, J. P.; Lutz, J. H.; Seaton, M. J. +1 more
The planetary nebula NGC 7662 considered in the present investigation has been a popular object for detailed modelling. Two models are considered. In Model I, which is similar to a model considered by Harrington et al. (1979), dust absorption is neglected. The model cannot provide results which are in agreement with two types of observational data…