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Planetary foreshock radio emissions
Cairns, Iver H.; Kuncic, Zdenka
The electron foreshock regions upstream of Earth's bow shock and upstream of traveling interplanetary shocks are known to be propitious sites for a variety of energetic particle and plasma wave phenomena, including radio emissions. A quantitative theoretical model has been developed for radio emissions associated with the terrestrial foreshock and…
GRB 040403: A faint X-ray rich gamma-ray burst discovered by INTEGRAL
Frontera, F.; Hurley, K.; Götz, D. +13 more
GRB 040403 is one of the faintest gamma-ray bursts for which a rapid and accurate localization has been obtained. Here we report on the gamma-ray properties of this burst, based on observations with the IBIS instrument aboard INTEGRAL, and the results of searches for its optical afterglow. The steep spectrum (power law photon index = 1.9 in the 20…
The Infrared-dominated Jet of 3C 401
Axon, David J.; Chiaberge, Marco; Capetti, Alessandro +6 more
We present a Hubble Space Telescope image of the FR II radio galaxy 3C 401, obtained at 1.6 µm with NICMOS, in which we identify the infrared counterpart of the brightest region of the radio jet. The jet has a complex radio structure and brightens where bending occurs, most likely as a result of relativistic beaming. We analyze archival data…
Energetic Particles in the Magnetosphere of Saturn and a Comparison with Jupiter
Krupp, Norbert
The extragalactic Cepheid bias: significant influence on the cosmic distance scale
Paturel, G.; Teerikorpi, P.
The unique measurements with the Hubble Space Telescope of Cepheid variable stars in nearby galaxies led to extragalactic distances that made the HST Key Project conclude that the Hubble constant is H0 = 72 km s-1 Mpc-1. The idea that H0 is now known is widely spread among the astronomical community. Som…
Photographic Zenith Tubes Observations to Improve HIPPARCOS Proper Motion in Declination of Some Stars
Damljanovic, G.
A procedure of calculation and results of an attempt to improve proper motions in declination for some HIPPARCOS stars are presented. A long series of optical observations of these stars observed with Photographic Zenith Tubes (PZT) are used. The HIPPARCOS ESA mission (ESA 1997) was nearly 4 years long, but each of the different Earth rotation pro…
First detections of the cataclysmic variable AE Aquarii in the near to far infrared with ISO and IRAS: Investigating the various possible thermal and non-thermal contributions
de Martino, D.; Schulz, B.; Fender, R. +13 more
We have used ISO to observe the Magnetic Cataclysmic Variable AE Aquarii in the previously unexplored range from 4.8 µm up to 170 µm in the framework of a coordinated multi-wavelength campaign from the radio to optical wavelengths. We have obtained for the first time a spectrum between 4.8 and 7.3 µm with ISOCAM and ISOPHOT-P: th…
A Martian PFS average spectrum: Comparison with ISO SWS
Lellouch, E.; Encrenaz, T.; Piccioni, G. +13 more
The evaluation of the planetary Fourier spectrometer performance at Mars is presented by comparing an average spectrum with the ISO spectrum published by Lellouch et al. [2000. Planet. Space Sci. 48, 1393.]. First, the average conditions of Mars atmosphere are compared, then the mixing ratios of the major gases are evaluated. Major and minor bands…
An Astrometric Study of the Binary Star α Ophiuchi
Gatewood, George
The work reported here combines data from the Multichannel Astrometric Photometer (MAP), the European astrometric satellite, Hipparcos, and infrared speckle observations of the nearby subgiant binary star system α Oph. The A5 IV primary is found to have a mass of 2.84+/-0.19 Msolar, while the approximately K2 V companion has a mass of 0…
A Possible High Nova Rate for Two Local Group Dwarf Galaxies: M32 and NGC 205
Shara, Michael M.; Neill, James D.
We report the results of a preliminary nova survey of Local Group dwarf elliptical galaxies. We used the 15' field-of-view CCD camera on the 0.8 m telescope at the Tenagra Observatory to observe M32, NGC 205, NGC 147, and NGC 185 in their entirety every clear night over a 4.5 month interval and discovered one nova in M32 and a candidate nova in NG…