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Time-correlation of the solar p-mode velocity signal from GOLF
Roca Cortes, T.; Ulrich, R. K.; Grec, G. +5 more
Since the launch of SOHO, the Solar Heliospheric Orbital Observatory, the helioseismic observations are nearly uninterrupted. The GOLF instrument (A. Gabriel et al., 1997) measures the mean velocity integrated over the disk. The autocorrelation function of this velocity shows two main features: Firstly, the initial decrease of the peak amplitudes …
The X-ray jet in the merging galaxy system Markarian 266
Kollatschny, W.; Kowatsch, P.
We present deep ROSAT X-ray images of the double nucleus galaxy Mrk 266 in combination with optical images and spectra. The High Resolution Imager (HRI) X-ray morphology can be divided into four components: two nuclei of the merging galaxies, a diffuse galactic component and a strong northern jet coincident with very strong optical line emission. …
Quasi-periodic behavior of ion events and wave activity upstream from Jupiter's Bow Shock: Ulysses' observations
Balogh, A.; Sarris, E. T.; Anagnostopoulos, G. C. +3 more
A new insight into the ways that the Jovian magnetosphere influences the near Jupiter interplanetary space becomes possible thanks to Ulysses' collection of magnetic field, plasma and energetic ion (HI-SCALE) data during its inbound trajectory (d22-d34, 1992). The most striking new results from the analysis of those data are the following: a) pres…
The Search for Solar Gravity-Mode Oscillations in the Solar Wind Using it Ulysses Plasma Data
Riley, Pete; Hoogeveen, Gary W.
A recent report that energetic particles measured in the solar wind may be influenced by solar gravity-mode (-mode) oscillations motivated the search for -mode signatures in the Ulysses solar wind plasma data. Ulysses solar wind plasma data from 1 March 1992 through the 12 April 1996 were examined in this study for signs of possible solar oscillat…
High latitude ULYSSES observations of CIR accelerated ions and electrons
Simnett, G. M.; Sayle, K. A.
From the comparison of the intensity maxima of ~ 1 MeV/nuc. ions with those of the 40-65 keV electrons and higher energy ions ( ~ 2-4 and 4-8 MeV/nuc.), during Ulysses' ascent to the solar south pole, 1992-1994, evidence has been found for the ~ 1 MeV/nuc. ions observed at high latitude by the Ulysses spacecraft to have originated at mid-latitudes…
Magnetic field models for A and B stars. V. The magnetic field and photometric variation of 84 Ursae Majoris
Manset, N.; Wade, G. A.; Bastien, P. +2 more
We present new longitudinal magnetic field and Stroemgren photometric measurements of the Bp star 84 UMa. From these data we determine a new rotational period Prot=1.38576 deg +/- 0.00080 deg, which is inconsistent with previously published values. The magnetic measurements indicate the presence of a weak, dominantly dipolar magnetic fi…
D/H-ratio: Observations with ORFEUS II
Werner, K.; Grewing, M.; Appenzeller, I. +12 more
During the second flight of the ORFEUS-SPAS satellite (Nov./Dec. 96) high resolution (λ/{Deltalambda} = 10,000) Echelle-spectra of BD +28^\circ 4211 in the wavelength regime 912 - 1400 Angstroms have been taken. Deuterium can be clearly identified in the ORFEUS-II Echelle-spectra of this star. For the first time it was possible to take spectra of …
Recalibration of the Wilson-Bappu Effect Using the Singly Ionized Magnesium K Line
Mena-Werth, Jose; Scoville, Frederick
A new calibration of the Wilson-Bappu effect is presented using data from a survey of the singly ionized magnesium (Mg ii) h and k lines (near 280 nm) taken from the archives of the International Ultraviolet Explorer satellite. Our sample consisted of 94 stars with absolute magnitudes derived from parallaxes reported from Hipparcos. We describe th…
The space distribution of HIPPARCOS carbon stars
Bergeat, J.; Knapik, A.; Rutily, B.
More than 300 galactic carbon-rich stars have been observed by the HIPPARCOS satellite. Parallaxes and proper motions are given with an unprecedented accuracy. Carbon stars are however distant giants and there are only 4 stars with a parallax accuracy better than 20 % (26 stars if 30 %). Direct use of observed data is thus severely hampered by sta…
Spectroscopic binary orbits from ultraviolet radial velocities. Paper 27: Tau Canis Majoris (HD 57061)
Stickland, D. J.; Lloyd, C.; Sweet, I.