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Multi-point observation of the high-speed flows in the plasma sheet
Balogh, A.; Zhang, T. L.; Klecker, B. +9 more
The structure of the high-speed flows in the midtail plasma sheet is discussed based on results from multi-point observation of Cluster spacecraft in summer 2001 and 2002. The average rate of change in flow speed along the "dawn-dusk" direction (perpendicular to the main flow and in the plane of the tail current sheet) and along the "north-south" …
A Variability Study of the Seyfert 2 Galaxy NGC 6300 with XMM-Newton
Awaki, Hisamitsu; Hayashida, Kiyoshi; Leighly, Karen M. +3 more
We present the results of timing analysis of the XMM-Newton observation of the Seyfert 2 galaxy NGC 6300. The hard X-ray spectrum above 2 keV consists of a Compton-thin absorbed power law, as is often seen in Seyfert 2 galaxies. We clearly detected rapid time variability on a timescale of about 1000 s from the light curve above 2 keV. The excess v…
Abundances in planetary nebulae: NGC 6886
Pottasch, S. R.; Surendiranath, R.
ISO and IUE spectra of the round-shaped planetary nebula
Theoretical Isochrones with Extinction in the K Band
Lee, Myung Gyoon; Figer, Donald F.; Kim, Sungsoo S. +1 more
We calculate theoretical isochrones in a consistent way for five filters (K, K', Ks, F205W, and F222M) in the atmospheric window between 1.9 and 2.5 µm using the Padova stellar evolutionary models by Girardi et al. Even when displayed in the same Vega magnitude system, the near-infrared colors of the same isochrone can …
Midcourse Space Experiment Observations of Small Solar System Bodies
Lisse, C. M.; Mäkinen, T.; Walker, R. G. +4 more
Eight comets, two transition objects (extinct comet candidates), and two near-Earth asteroids were imaged in four infrared bands with the SPIRIT III instrument on the Midcourse Space Experiment, namely, C/1996 B2 (Hyakutake), C/1995 O1 (Hale-Bopp), C/1996 Q1 (Tabur), 126P/IRAS, 22P/Kopff, 46P/Wirtanen, (3200) Phaethon, (4015) 107P/Wilson-Harringto…
HD 166181 = V815 Herculis, a Single-lined Spectroscopic Multiple System
Pourbaix, D.; Fekel, Francis C.; Scarfe, C. D. +2 more
We have obtained extensive spectroscopic and velocity spectrometer observations of HD 166181, a previously known single-lined spectroscopic binary. Our improved orbit for the G6 V primary has a period of 1.8098343 days and is circular. Although the lines of additional components have not been detected, radial velocity measurements confirm that the…
Pulsar Wind Nebulae in Egret Error Boxes
Hessels, Jason W. T.; Ng, C. -Y.; Gaensler, Bryan M. +3 more
A remarkable number of pulsar wind nebulae (PWN) are coincident with EGRET γ-ray sources. X-ray and radio imaging studies of unidentified EGRET sources have resulted in the discovery of at least six new pulsar wind nebulae (PWN). Stationary PWN (SPWN) appear to be associated with steady EGRET sources with hard spectra, typical for γ-ray pulsars. T…
XMM-Newton discovery of soft X-ray absorption in the high-z superluminous Blazar RBS 315
Guainazzi, M.; Piconcelli, E.
We present the analysis and the results of a 20 ks XMM-Newton observation of the extremely X-ray loud (LX ≈ 5 × 1047 erg s-1) flat-spectrum radio quasar RBS 315 at a redshift of 2.69. This EPIC observation has allowed us to strongly constrain the slope of the continuum (Γ = 1.23±0.01) as well as to discover the pre…
Is Arcturus a well-understood K giant?. Test of model atmospheres and potential companion detection by near-infrared interferometry
Eriksson, K.; Decin, L.; Verhoelst, T. +8 more
We present near-IR interferometric measurements of the K1.5 giant Arcturus (α Bootis), obtained at the IOTA interferometer with the FLUOR instrument, in four narrow filters with central wavelengths ranging from 2.03 µm to 2.39 µm. These observations were expected to allow us to quantify the wavelength dependence of the diameter of a ty…
Interplanetary consequences caused by the extremely intense solar activity during October-November 2003
Kojima, Masayoshi; Tokumaru, Munetoshi; Fujiki, Ken'ichi +2 more
We report interplanetary scintillation (IPS) measurements made by the 327 MHz four-station system of the Solar-Terrestrial Environment Laboratory of Nagoya University, during 21 October to 8 November 2003. In this period, solar activity increased greatly owing to the appearance of huge eruptive sunspots on the solar disk. Interplanetary (IP) distu…