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Properties and nature of Be stars Dra. XXIII. Long-term variations and physical properties of κ Dra.
Harmanec, P.; Hadrava, P.; Krtička, J. +9 more
We present an analysis of new spectroscopic observations of the bright Be star
New Light Curves and Orbital Solution for AM Leonis
Terrell, Dirk; Hiller, Mary E.; Osborn, Wayne
New UBVRI photometry has been obtained for the W UMa eclipsing system AM Leonis. The data have been used to derive nine times of minimum and to construct light curves. The minimum timings show that the system recently had a significant period increase. Modeling of the light curves shows AM Leo to be an overcontact system with a mass ratio of 2.51.…
Quasi-periodic emissions (15- 80 min) from the poles of Jupiter as a principal source of the large-scale high-latitude magnetopause boundary layer of energetic particle
Preka-Papadema, P.; Anagnostopoulos, G. C.; Karanikola, I. +2 more
In this study, we concentrate on the examination of the quasi-periodic behavior of 0.5-1.6 MeV(∼40-400 keV) protons (electrons) and of relativistic (>16 MeV) electrons, observed at Jupiter by two different experiments onboard Ulysses, the HI-SCALE and COSPIN, respectively, within the large-scale south duskside magnetopause boundary layer (MPBL)…
An X-ray absorption analysis of the high-velocity system in NGC 1275
Fabian, A. C.; Sanders, J. S.; Gillmon, K.
We present an X-ray absorption analysis of the high-velocity system (HVS) in NGC 1275 using results from a deep 200-ks Chandra observation. We are able to describe the morphology of the HVS in more detail than ever before. We present a Hubble Space Telescope image for comparison, and note close correspondence between the deepest X-ray absorption a…
Nuclear Stellar Populations in the Infrared Space Observatory Atlas of Bright Spiral Galaxies
Bendo, George J.; Joseph, Robert D.
To understand the nuclear stellar populations and star formation histories of the nuclei of spiral galaxies, we have obtained K-band nuclear spectra for 41 galaxies and H-band spectra for 20 galaxies in the Infrared Space Observatory's Atlas of Bright Spiral Galaxies. In the vast majority of the subsample (80%), the near-infrared spectra suggest t…
On the wave mode of subsecond pulses in the cm-range
Altyntsev, A. T.; Meshalkina, N. S.; Yihua, Yan +2 more
In this paper we determined the wave mode of subsecond pulses (SSP). We used data on pulses with a degree of polarization over 30%, with the sources located at −60 to +60 deg from the central meridian, for the period 2000-2002. The superposition of SSRT radio maps and MDI magnetograms has shown that radio SSP sources are typically located near the…
Analysis of Ulysses data: Radiation pressure effects on dust particles
Krüger, H.; Grün, E.; Wehry, A.
The objective of this paper is to illustrate the influence of the radiation pressure and the electromagnetic force on dust particles in interplanetary space. Between 1990 and 2001 62 so-called β-meteoroids (β describes the ratio of the radiation pressure force to gravity) were detected as dust particles coming from the inner solar system on hyperb…
Orbits and masses of Saturn's coorbital and F-ring shepherding satellites
French, Richard G.; Jacobson, Robert A.
We have obtained numerically integrated orbits for Saturn's coorbital satellites, Janus and Epimetheus, together with Saturn's F-ring shepherding satellites, Prometheus and Pandora. The orbits are fit to astrometric observations acquired with the Hubble Space Telescope and from Earth-based observatories and to imaging data acquired from the Voyage…
A 150 MG Magnetic White Dwarf in the Cataclysmic Variable RX J1554.2+2721
Gänsicke, B. T.; Beuermann, K.; de Martino, D. +4 more
We report the detection of Zeeman-split Lyα absorption π and σ+ lines in the far-ultraviolet Hubble Space Telescope/Space Telescope Imaging Spectrograph (STIS) spectrum of the magnetic cataclysmic variable RX J1554.2+2721. Fitting the STIS data with magnetic white dwarf model spectra, we derive a field strength of B~=144 MG and an effec…
The August 11th, 1999 CME
Koutchmy, S.; Baudin, F.; Bocchialini, K. +5 more
We present here a set of observations, space borne and ground based, at different wavelengths, of the solar corona at and after the time of the total solar eclipse of August 11{th}. It is used to consider some unusual features of the coronal dynamics related to a limb Coronal Mass Ejection (CME) observed after the total eclipse. The complementary …