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S MUS B Revisited

Evans, Nancy Remage; Massa, Derck; Teays, Terry J.

IUE high dispersion spectra have been used to investigate the spectral type of the companion of the classical Cepheid S Mus, using Si II and III lines near 1300 A. In addition, the energy distribution from 1200 to 3200 A from IUE low resolution spectra has also been compared with standard stars. The resulting spectral type is B3.5 V (with a redden…

The Binary System Containing the Classical Cepheid T MON

Evans, Nancy Remage; Lyons, Ronald W.

Several new results are presented for the binary system containing the 27^d classical Cepheid T Mon. New radial velocities for the Cepheid have been obtained, which confirm the decreasing orbital motion at the current epoch. The spectral type of the companion (B9.8 V) has been determined from an International Ultraviolet Explorer (IUE) l…

Evidence that Jupiter is not the source of the 2-3 kHz heliospheric radiation

Gurnett, D. A.; Kurth, W. S.

It has been suggested that continuum radiation from Jupiter could provide the source for the 2- to 3-kHz radio emissions detected by Voyagers 1 and 2 in the outer heliosphere. By a fortuitous set of circumstances the Ulysses flyby of Jupiter in early 1992 provided an opportunity to compare the intensity of a strong, new heliospheric radio emission…

Photometric calibration of the international Ultraviolet Explorer (IUE) for high resolution spectra.

Vogel, M.; Gonzalez-Riestra, R.; Cassatella, A. +2 more

We present and discuss the high resolution absolute calibration for the SWP, LWP and LWR cameras on board IUE. The calibration was implemented in routine processing on 27 December, 1987 at VILSPA and on 30 August, 1990 at GSFC. The calibration is applicable to high resolution spectra processed with the 'new' version of the IUE spectral image proce…

Spectroscopic binary orbits from ultraviolet radial velocities. Paper 16: EM Carinae (HD 97484)

Corcoran, M. F.; Stickland, D. J.; Lloyd, C.

The structure of mass-loading shocks. 1. Comets

Neubauer, F. M.; Zank, G. P.; Story, T. R.

A new multifluid model to describe the solar wind-cometary ion plasma in the outer cometary coma is derived. This model is distinguished from previous multifluid models in that wave-particle effects are included explicitly. By considering hydrodynamic timescales, self-consistent dissipative terms (which correspond to the spatial diffusion of comet…

Pulsational Activity on Ik-Pegasi

Kellett, B. J.; Lloyd, C.; Smalley, B. +1 more

High-time-resolution photometry of millimagnitude precision using the Fine Error Sensor on board the International Ultraviolet Explorer is presented. A few hours of data, when subjected to an optimal (Bayesian) analysis, reveal two pulsational frequencies in the star 1K Peg A, one of which was not previously known. A fit to the empirical P-L-C rel…

Simultaneous observations of γ-ray bursts with Phebus/Granat and ULYSSES GRB.

Hurley, K.; Sunyaev, R.; Sommer, M. +9 more

We compare the characteristics of 35 gamma-ray bursts (GRBs) detected simultaneously by Phebus aboard Granat and the Ulysses GRB experiment. Phebus observes a medium to high energy range (100 keV - 100 MeV), while the Ulysses GRB detector is sensitive to lower energy photons (25-150 keV). Comparison of the peak counts recorded by these two instrum…

Giotto ion mass spectrometer measurements at comet P/Grigg-Skjellerup

Altwegg, K.; Balsiger, H.; Neubauer, F. M. +6 more

The Giotto ion mass spectrometer high-intensity spectrometer (IMS-HIS) measured fluxes of ions from about 260,000 km before (1008:36 UT spacecraft time) to about 86,000 km after (1701:33 UT spacecraft time) closest approach to comet P/Grigg-Skjellerup during the encounter on July 10, 1992. Although the HIS sensor was not designed to measure proton…

A statistical study of IUE spectra of dwarf novae. I. Quiescence.

Deng, Shi-Bing; Zhang, Zhong-Yong; Chen, Jian-Sheng

Based on more than 1200 IUE spectra of dwarf novae, we investigate the statistical properties of these systems, concerning the correlation of the spectra with parameters of the binary system. The results provide a way of testing the current accretion disk model and of understanding the physical conditions in dwarf novae. The present paper is restr…