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X-ray emission diagnostics from the M87 jet
Wilson, A. S.; Perlman, E. S.
We use Chandra, HST and VLA observations of M87 to investigate the physics of X-ray emission from AGN jets. We find that X-ray hotspots in the M87 jet occur primarily in regions with hard optical-to-X-ray spectra and lower than average polarization. Particle injection appears to be required both continuously in the jet sheath as well as locally at…
Kinematic Analysis of Near and Far Stars in the Hipparcos Catalog
Vityazev, V. V.; Drobit'ko, E. V.
The proper motions of stars in the main sequence and of luminosity class III giants are analyzed kinematically. A new method has been used for reliably separating all the parameters of the Ogorodnikov-Milne model based on representing the proper motions of the stars in coordinate systems whose poles lie on each of the three principal axes of the g…
UV and EUV observations of stellar coronal structure and activity
Brown, Alexander
Ultraviolet (HST, FUSE) and extreme-ultraviolet (EUVE) observations of stellar coronae and flare-related activity are reviewed, with particular attention being devoted to the coronas information that is obtainable in the ultraviolet but not from the X-ray region. The coronas temperature, density, and emission measure distributions of active stars …
Spectrophotometry of speckle binary stars III
Al-Wardat, M. A.
Spectrophotometric observations of a third set consisting of 11 stars of speckle interferometric binaries are presented. Observations covered the range 3700-8400 Å, with a resolution of 18 Å. Results are presented in the form of the measured flux corrected for atmospheric extinction in the units of erg/cm2\cdot s \cdot Å, with no correc…
Two new optical jets in B2 radio galaxies
Bondi, M.; Capetti, A.; Morganti, R. +5 more
We present HST observations of previously undetected optical jets in the low-luminosity radio galaxies B2 0755+37 and B2 1553+24. We show that there is accurate spatial coincidence between optical and radio emission, implying that the former is likely to be synchrotron radiation. The physical properties of the jets are similar to those known previ…
Telescopic and Microscopic views of the magnetosphere: Multispacecraft observations
Baker, D. N.
The magnetospheric research community has long sought the capability to view the Sun-Earth system in a global way and to probe concurrently the microphysical details of key physical regions. This objective has now been substantially realized with the combination of the CLUSTER and IMAGE missions. With the additional use of SOHO, ACE, FAST, SAMPEX,…
Chandra X-Ray Observations of Early Type Galaxies
KIM, DONG-WOO
Energetic H/He intensity ratio under solar maximum and solar minimum conditions: Ulysses observations
Lario, D.; Roelof, E. C.; Maclennan, C. G. +3 more
We study the solar cycle variability of the heliospheric energetic proton-to-helium abundance ratios. We use 0.5-1.0 MeV nucleon -1 proton and helium intensities observed by the Ulysses spacecraft at both high and low heliographic latitudes. Ulysses observations show that during solar maximum the 0.5-1.0 MeV nucleon -1H/He in…
Near infrared photometry for 20 Hipparcos carbon stars
Chen, P. S.; Yan, X. H.; Wang, X. H.
The near infrared photometry in the JHK bands is made for 20 Hipparcos carbon stars. From the results of the near infrared photometry, the bolometric corrections in the K band, the apparent bolometric magnitudes and the effective temperatures can be estimated. Combined with the trigonometric parallaxes observed with the Hipparcos satellite, the ab…
Solar Cycle Variation in GONG and MDI Data : 1995-2002
Tripathy, S. C.
Both GONG and MDI projects have measured p-mode frequencies of the Sun for more than 7 years. Here we review what we have learnt from the temporal variation of the oscillation frequencie and splitting coefficients.