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The 1993-1994 Activity of EX Lupi
Herbig, G. H.; Aspin, C.; Gilmore, Alan C. +2 more
EX Lupi is a classical T Tauri star (and the EXor prototype) subject to sporadic outbursts. The historic record shows that it remains at about V=13.2 (or mpg=14.7:) for extended periods, from which it has been observed to brighten to as much as V=8.4 (on one occasion in 1955-1956). During 1993-1994 the star remained slightly above norma…
A Short-Timescale Candidate Microlensing Event in the POINT-AGAPE Pixel Lensing Survey of M31
Giraud-Héraud, Y.; Evans, N. W.; Smartt, S. J. +14 more
We report the discovery of a short-duration microlensing candidate in the northern field of the POINT-AGAPE pixel lensing survey toward M31. Almost certainly, the source star has been identified on Hubble Space Telescope archival images, allowing us to infer an Einstein crossing time of tE=10.4 days, a maximum magnification of Amax…
Seismic Imaging of the Far Hemisphere of the Sun
Braun, D. C.; Lindsey, C.
We apply phase-sensitive helioseismic holography to Solar and Heliospheric Observatory/Michelson Dopper Imager data to demonstrate how acoustic travel-time perturbations may be mapped over the entire portion of the Sun facing away from the Earth, including the polar regions. In addition to offering significant improvements to ongoing space weather…
Multicolor Observations of the GRB 000926 Afterglow
Axelrod, T. S.; Price, P. A.; Harrison, F. A. +25 more
We present multicolor light curves of the optical afterglow of gamma-ray burst (GRB) 000926. Beginning ~1.5 days after the burst, the light curves of this GRB steepen measurably. The existence of such achromatic breaks is usually taken to be an important observational signature that the ejecta are not expanding isotropically but rather have a coll…
Ulysses' Second Orbit: Remarkably Different Solar Wind
McComas, D. J.; Goldstein, R.; Gosling, J. T. +1 more
By the time of the 34th ESLAB symposium, dedicated to the memory of John Simpson, Ulysses had nearly reached its peak southerly latitude in its second polar orbit. The global solar wind structure observed thus far in Ulysses' second orbit is remarkably different from that observed over its first orbit. In particular, Ulysses observed highly irregu…
Evolution of magnetic field fluctuations in high-speed solar wind streams: Ulysses and Helios observations
Balogh, A.; Horbury, T. S.
Ulysses magnetic field measurements in high-speed streams emanating from the Sun's polar coronal holes reveal a complex combination of fluctuations on different scales. Measurements of the wavenumber dependence of radial and latitudinal power scaling, spectral index, and anisotropy of undisturbed polar magnetic field fluctuations between 1.4 and 4…
The X-ray nebula of the filled center supernova remnant 3C 58 and its interaction with the environment
Bocchino, F.; Warwick, R. S.; Becker, W. +3 more
An XMM-Newton observation of the plerionic supernova remnant 3C 58 has allowed us to study the X-ray nebula with unprecedented detail. A spatially resolved spectral analysis with a resolution of 8'' has yielded a precise determination of the relation between the spectral index and the distance from the center. We do not see any evidence…
FUSE and Hubble Space Telescope/STIS Observations of Hot and Cold Gas in the AB Aurigae System
Deleuil, M.; Bouret, J. -C.; Roberge, A. +9 more
We present the first observations of a Herbig Ae star with a circumstellar disk by the Far-Ultraviolet Spectroscopic Explorer (FUSE) as well as a simultaneous observation of the star obtained with the Hubble Space Telescope/Space Telescope Imaging Spectrograph (STIS). The spectra of AB Aurigae show emission and absorption features arising from gas…
Ion cyclotron diffusion of velocity distributions in the extended solar corona
Cranmer, Steven R.
The Ultraviolet Coronagraph Spectrometer aboard the Solar and Heliospheric Observatory has revealed strong kinetic anisotropies and extremely large perpendicular temperatures of heavy ions in the extended solar corona. These observations have revived interest in the idea that the high-speed solar wind is heated and accelerated by the dissipation o…
Hubble Space Telescope NICMOS Spectroscopy of Charon's Leading and Trailing Hemispheres
Schneider, Glenn; Dumas, Christophe; Terrile, Richard J. +2 more
We used the near-infrared camera and multiobject spectrometer NICMOS on the Hubble Space Telescope to obtain 1.1-2.4 µm, low-resolution (R~200) slitless grism spectrophotometry of the individual members of the Pluto-Charon system. Water ice is present in its crystalline state on both the leading and trailing hemispheres of Charon. A 2.21 &mi…