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Heating the magnetically open ambient background corona of the Sun by Alfvén waves
Peter, H.; Vocks, C.
Observations of UVCS/SOHO of very high emission line widths in the outer corona suggest that the open field regions there are heated by ion-cyclotron resonance absorption of Alfvén waves resulting in the ions being much hotter than the electrons. In the lower corona it is usually assumed that the effective Coulomb-interactions ensure equal tempera…
Spectroscopic Identification of White Dwarfs in the New Luyten Two-Tenths Survey
Vennes, Stéphane; Kawka, Adela
We spectroscopically identify New Luyten Two-Tenths (NLTT) stars from the reduced proper-motion diagram of Salim & Gould. Five out of 16 objects investigated are identified as white dwarfs: four hydrogen-rich DA stars (NLTT 8581, NLTT 31748, NLTT 53177, and NLTT 56805) and one helium-rich (NLTT 8435). The properties of the stars are further co…
Heliospheric ``FALTS'': Favored Acceleration Locations at the Termination Shock
McComas, D. J.; Schwadron, N. A.
The standard explanation for Anomalous Cosmic Rays requires strong energization at the heliospheric termination shock. However, the tightly wrapped magnetic spiral in the outer heliosphere produces a quasi-perpendicular shock where it is difficult to accelerate low energy particles. We show that motion of footpoints between regions of fast and slo…
Far infrared observations of pre-protostellar sources in Lynds 183
Prusti, T.; Juvela, M.; Lemke, D. +3 more
Using ISOPHOT maps at 100 and 200 mu m and raster scans at 100, 120, 150 and 200 mu m we have detected four unresolved far-infrared sources in the high latitude molecular cloud L 183. Two of the sources are identified with 1.3 mm continuum sources found by Ward-Thompson et al. (\cite{wthompson94}, \cite{wthompson00}) and are located near the tempe…
Detection of Far-Infrared Features in Star-Forming Regions
Onaka, Takashi; Okada, Yoko
We report the detection of a feature at 65 µm and a broad feature around 100 µm in the far-infrared spectra of the diffuse emission from two active star-forming regions, the Carina Nebula and Sharpless 171. The features are seen in the spectra over a wide area of the observed regions, indicating that the carriers are fairly ubiquitous …
Cluster observations of the high-altitude cusp for northward interplanetary magnetic field: A case study
Lavraud, B.; Dunlop, M. W.; Bosqued, J. M. +7 more
Since January 2001, the multisatellite and multiinstrument CLUSTER mission gives a unique opportunity to study the structure and dynamics of the high-altitude polar cusp. On 17 March 2001, CLUSTER sampled the northern high-altitude cusp (7-9RE) around noon for more than 1 hour during very quiet interplanetary and magnetospheric conditio…
13C isotope effects on infrared bands of quenched carbonaceous composite (QCC)
Onaka, T.; Yamamura, I.; Wada, S. +2 more
We investigate carbon isotope effects on the infrared bands of a laboratory analogue of carbonaceous dust, the quenched carbonaceous composite (QCC), synthesized from a plasma gas of methane with various 12C/13C ratios. Peak shifts to longer wavelengths due to the substitution of 12C by 13C are clearly o…
Optical Positions of ICRF Sources Using UCAC Reference Stars
Zacharias, N.; Assafin, M.; Zacharias, M. I. +4 more
New optical positions on the 30 mas precision level have been obtained for 172 extragalactic International Celestial Reference Frame (ICRF) sources mainly in the range -30°<=δ<=+25°. Results are presented from a pilot investigation including four Cerro Tololo (CTIO) 0.9 m runs (1999-2001). Reference stars in the R~10-16.5 mag range from a pr…
An X-Ray Image of the Composite Supernova Remnant SNR G16.7+0.1
Gotthelf, E. V.; Agüeros, Marcel A.; Helfand, David J.
We have observed the Galactic supernova remnant G16.7+0.1 for 13 ks using the EPIC cameras on board the XMM-Newton X-Ray Observatory, producing the first X-ray image of the remnant. This composite radio remnant has a core radio flux density of only 100 mJy, making it one of the faintest radio synchrotron nebulae yet detected, although the core-to-…
The First Results of Observations of the Transient Pulsar SAX J2103.5+4545 by the INTEGRAL Observatory
Lutovinov, A. A.; Revnivtsev, M. G.; Molkov, S. V.
We present the preliminary results of our analysis of the observations of the X-ray pulsar SAX J2103.5+4545 by the INTEGRAL Observatory in December 2002. We mapped this region of the sky in a wide energy range, from 3 to 200 keV. The detection of the source is shown to be significant up to energies of ~100 keV. The hard X-ray flux in the energy ra…