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Photometric study of the binary system NN Del
Gómez-Forrellad, J. M.; Sánchez-Bajo, F.; Corbera-Subirana, M. +2 more
We present the results of the differential V light curve analysis of NN Del. We show that NN Del is an EA eclipsing binary system with a period of 99.27 days and a highly eccentric orbit. Photometric solutions obtained using the Russell and the Wilson-Devinney models seem to indicate that both components are very similar in radii and luminosities …
Experimental studies of wave-particle interactions in space using particle correlators: Results and future developments
Gough, M. P.; Buckley, A. M.; Carozzi, T. +1 more
The technique of particle correlation measures directly electron modulations that result from naturally occurring and actively stimulated wave-particle interactions in space plasmas. In the past this technique has been used for studies of beam-plasma interactions, caused by both natural auroral electron beams via sounding rockets and by artificial…
A study of the Mg II 2796.34 Å emission line in late-type normal and RS CVn stars
Badiali, M.; Cardini, D.; Altamore, A. +2 more
We carry out an analysis of the Mg II 2796.34 Å emission line in RS CVn stars and make a comparison with the normal stars studied in a previous paper (Paper I). The sample of RS CVn stars consists of 34 objects with known HIPPARCOS parallaxes and observed at high resolution with IUE. We confirm that RS CVn stars tend to possess wider Mg II lines t…
High order spectral analysis of electron plasma oscillations in the electron foreshock
Gurnett, D. A.; Pickett, J. S.; Walker, S. N. +1 more
The electron foreshock is the region in which electrons that have been reflected from the shock propagate back upstream along the magnetic field lines forming electron beams. The process of relaxation of these beams is one of the fundamental topics in plasma physics. It involves numerous nonlinear processes. High order spectral analysis is applied…
Inverse projection method for determination of distribution of real CME latitudes applied to the 1997-1998 SOHO LASCO observations
Skirgiello, Marta
Coronograph observations of coronal mass ejections (CMEs) do not provide the real latitude of their origin. The registered apparent latitude is the projection of the CME trajectory on the plane of the sky, and it may considerably differ from their original location. We show in this paper, how the projection effects can be eliminated from CME latit…
Solar radio observations and development of coronal mass ejections
Pick, M.; Maia, D.; Marqué, Ch.
We present in this study a synthesis of results on the initiation and development of CMEs using coordinated observations from SOHO and ground-based instruments. The emphasis is placed on radio spectral and imaging data. One important goal of this study is the identification of radio signatures of CMEs providing information below one solar radius a…
IBIS performances during the Galactic Plane Scan. I. The Cygnus region
Rodriguez, J.; Foschini, L.; Capitanio, F. +8 more
The Plane of our Galaxy is regularly observed by the INTEGRAL satellite by means of scheduled scans. We present here results from the IBIS/ISGRI instrument using data from the first two Galactic Plane Scans performed at the end of the Performance Verification phase, while INTEGRAL was pointed towards the Cygnus region.
Considering the predict…The Infrared Spectral Energy Distribution of the Seyfert 2 Prototype NGC 5252
Acosta-Pulido, J. A.; Prieto, M. Almudena
The complete mid- to far-infrared continuum energy distribution collected with the Infrared Space Observatory of the Seyfert 2 prototype NGC 5252 is presented. ISOCAM images taken in the 3-15 µm show a resolved central source that is consistent at all bands with a region of about 1.3 kpc in size. Because of the lack of ongoing star formation…
Some statistical aspects of estimating the local red clump absolute magnitude
Koen, Chris; Lombard, Fred
Various statistical issues regarding estimation of the mean absolute magnitude of the red clump stars, using Hipparcos parallaxes, are discussed. The problem is put in the broader context of estimation of the functional dependence of the absolute magnitude on colour of local giant stars, as derived from Hipparcos observations. The methods used inc…
Near-infrared photometry of 20 hipparcos carbon stars
Chen, Pei-Sheng; Yang, Xiao-Hong; Wang, Xun-Hao
Near-infrared JHK photometry was carried out for 20 carbon stars observed by the satellite Hipparcos. From the observations, bolometric corrections in the K band ( BCK), apparent bolometric magnitudes ( mrmbo) and effective temperatures ( Te) of these stars were estimated. Combined with the trigonometric parallaxes…