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SOHO-Ulysses Spring 2000 Quadrature: Coronal Diagnostic Spectrometer and SUMER Results
Parenti, S.; Landi, E.; Bromage, B. J. I.
We present results from SOHO/CDS and SOHO/SUMER coordinated observations of coronal streamers made during the spring 2000 quadrature of SOHO, the Sun, and Ulysses. These observations form part of the JOP 112, which is primarily aimed at investigating the composition of the regions of the corona and the solar wind observed by both SOHO and Ulysses.…
XMM-Newton observation of the X-ray point source population of the starburst galaxy IC 342
Kong, Albert K. H.
We present the results of an XMM-Newton observation of the starburst galaxy IC 342. Thirty-seven X-ray point sources were detected down to a luminosity limit of ~1037 erg s-1. Most of the sources are located near the spiral arms. The X-ray point source luminosity function is consistent with a power-law shape with a slope of 0…
Doubly Ionized Carbon Observed in the Plasma Tail of Comet Kudo-Fujikawa
Feldman, Paul D.; Raymond, John C.; Povich, Matthew S. +6 more
Comet C/2002 X5 (Kudo-Fujikawa) was observed near its perihelion of 0.19 astronomical unit by the Ultraviolet Coronagraph Spectrometer aboard the Solar and Heliospheric Observatory spacecraft. Images of the comet reconstructed from high-resolution spectra reveal a quasi-spherical cloud of neutral hydrogen and a variable tail of C+ and C…
A parametric study of the influence of ion and electron properties on the excitation of electromagnetic ion cyclotron waves in coronal mass ejections
Farrugia, Charles J.; Dasso, Sergio; Gratton, Fausto T.
Interplanetary coronal mass ejections (ICMEs) often possess a negative proton thermal anisotropy, Ap = T⟂,p/T∥,p - 1 < 0 (T∥, T⟂: parallel and perpendicular temperatures, respectively) so that right-hand polarized electromagnetic ion cyclotron waves (EICWs) may be amplified by a kinetic ins…
ISO-SWS calibration and the accurate modelling of cool-star atmospheres. II. General results
Eriksson, K.; Gustafsson, B.; Decin, L. +5 more
The fine calibration of the ISO-SWS detectors (Infrared Space Observatory - Short Wavelength Spectrometer) has proven to be a delicate problem. We therefore present a detailed spectroscopic study in the 2.38-12 mu m wavelength range of a sample of 16 A0-M2 stars used for the calibration of ISO-SWS. By investigating the discrepancies between the IS…
Mid- to far-infrared spectroscopy of Sharpless 171
Okada, Y.; Onaka, T.; Shibai, H. +1 more
We have collected one-dimensional raster-scan observations of the active star-forming region Sharpless 171 (S171), a typical H Ii region-molecular cloud complex, with the three spectrometers (LWS, SWS, and PHT-S) on board ISO. We have detected 8 far-infrared fine-structure lines, [O Iii] 52 mu m, [N Iii] 57 mu m, [O I] 63 mu m, [O Iii] 88 mu m, [N…
The XMM-Newton View of the Nucleus of NGC 4261
Brandt, W. N.; Mushotzky, R.; Gliozzi, M. +2 more
We present the first results from an XMM-Newton observation of the Fanaroff-Riley type I galaxy NGC 4261, which harbors a supermassive black hole and a low-ionization nuclear emission-line region. Here we focus on the X-ray properties of the nucleus, using the European Photon Imaging Camera pn data. The 0.6-10 keV continuum in best fitted by a the…
The FERRUM Project: Experimental transition probabilities of [Fe II] and astrophysical applications
Lundberg, H.; Johansson, S.; Hartman, H. +9 more
We report on experimental transition probabilities for thirteen forbidden [Fe II] lines originating from three different metastable Fe Ii levels. Radiative lifetimes have been measured of two metastable states by applying a laser probing technique on a stored ion beam. Branching ratios for the radiative decay channels, i.e. M1 and E2 transitions, …
Tomography of a stellar X-ray corona: alpha Coronae Borealis
Mewe, R.; Audard, M.; Güdel, M. +1 more
We interpret the X-ray light curve obtained by XMM-Newton during a total X-ray eclipse in the nearby binary star
Astrometry with The Hubble Space Telescope: A Parallax of the Central Star of the Planetary Nebula NGC 6853
McArthur, B. E.; Franz, O. G.; Bradley, A. J. +17 more
We present an absolute parallax and relative proper motion for the central star of the planetary nebula NGC 6853 (the Dumbbell). We obtain these with astrometric data from the Fine Guidance Sensor 3, a white-light interferometer on the Hubble Space Telescope. Spectral classifications and VRIJHKT2M and DDO51 photometry of the stars makin…