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BI Lyncis: A hydrogen-deficient binary consisting of two low-mass giants of spectral types early-B and G
Jeffery, C. S.; Aznar Cuadrado, R.
New physical elements of HR 7428 and its Hα behaviour.
Frasca, A.; Catalano, S.; Marilli, E. +1 more
Chemical Abundances of the Accreting Magnetic White Dwarf in the Polar AM Herculis
Sion, Edward M.; DePasquale, Joseph
We consider the presence of absorption lines due to accreted metals in the photosphere of the magnetic (28 MG) white dwarf in the prototype polar AM Herculis. We have applied the Massa-Fitzpatrick flux-calibration correction to the archival IUE NEWSIPS SWP spectra of AM Her obtained during the optical low states, when the accretion rate is very lo…
Novel pixel detectors for X-ray astronomy and other applications
Strüder, L.; Lutz, G.; Richter, R. H.
Following previous work in particle physics, the MPI Semiconductor Laboratory has been founded with the purpose of developing novel semiconductor detectors for particle physics and X-ray astronomy. A short description of the already successfully concluded development of pn-CCDs for focal imaging in X-ray astronomy (XMM//Newton X-ray Observatory) i…
Small-Scale High-Temperature Structures in Flare Regions
Chernov, G. P.; Kovalev, V. A.; Hanaoka, I.
When analyzing YOHKOH/SXT, HXT (soft and hard X-ray) images of solar flares against the background of plasma with a temperature T ~ 6 MK, we detected localized (with minimum observed sizes of approximately 2000 km) high-temperature structures (HTSs) with T = (20-50) MK with a complex spatial-temporal dynamics. Quasi-stationary, stable HTSs form a …
MSX Observations of Diffuse UV Emission in Orion
Price, S. D.; Paxton, L. J.; Henry, R. C. +1 more
We have observed intense diffuse radiation in the UV (1400 Å - 2600 Å) from three fields around M42 in Orion. Intensities of 20000 photons cm-2 sr-1 s-1 Å-1 were observed to the east and west of M42 with 8000 photons cm-2 sr-1 s-1 Å-1 south of the nebula. Enhanced emission, perhaps associated with a nearby complex of molecular clouds observed in C…
26-day Analysis of Energetic Ion Observations at High and Low Heliolatitudes: Ulysses and ACE
Lario, D.; Forsyth, R. J.; Roelof, E. C. +1 more
We present observations of energetic (0.34 8 MeV) ions from the Ulysses spacecraft during its second ascent to southern high latitude regions of the heliosphere. We cover the period from January 1999 until mid-2000 as Ulysses moved from 5.2 AU and 18° S to 3.5 AU and 55° S. In contrast to the long-lived and well-defined ∼26-day recurrences that we…
Magnetic Field Observations of Transient Events at Ulysses, 1996 2000
Balogh, A.; Forsyth, R. J.; Smith, E. J. +1 more
During the years 1996 2000 solar activity has been gradually rising and is now close to maximum. At the same time the Ulysses spacecraft has performed a north to south traverse of the low latitude regions of the heliosphere and is now once again travelling through high southerly latitudes. We show some examples and report on the occurence rates of…
Background reduction for quiet time particle fluxes aboard the Solar and Heliospheric Observatory
Valtonen, E.; Torsti, J.; Kunow, H. +2 more
Two versions of a method are presented to determine the background of energetic particle telescopes during low-flux periods at low energies. Traditional procedures first evaluate pulse heights of particle sensors working in coincidence then select certain areas of the ΔE/Δx versus E plane, where E is energy, and finally, accept all events falling …
Evidence for prolonged main sequence stellar evolution of F stars in close binaries
Suchkov, A. A.
Binary F stars exhibit large brightness anomaly, which is defined here as the difference between the absolute magnitude from the \mboxuvby photometry and the actual absolute magnitude of the star. We have found that the anomaly inversely correlates with the binary components separation. There is evidence that the correlation reflects actual popula…