Search Publications
Solar p-mode frequencies at ℓ=2: What do analyses of unresolved observations actually measure?
Chaplin, W. J.; Elsworth, Y.; Appourchaux, T. +4 more
We have studied in detail the extraction of estimates of ℓ=2 p-mode frequencies from unresolved observations of the visible disc of the Sun. Examples of data of this type include ground-based observations made by the Birmingham Solar-Oscillations Network (BiSON), and space-borne observations made by the GOLF and VIRGO/SPM instruments on board the …
Galactic orbits of Planetary Nebulae unveil thin and thick disk populations and cast light on interaction with the interstellar medium
Mignani, R. P.; Wicenec, A.; Guglielmetti, F. +2 more
We report reliable proper motion values for the central stars of four Planetary Nebulae (PNe). The proper motions have been compiled from existing optical catalogues i.e. Tycho-2, UCAC2, USNO-B and GSC-II, which are the product of large scale surveys. Results from the different sources have been compared and excellent agreement has been found in a…
MgS in detached shells around carbon stars. Mining the mass-loss history
Hony, S.; Bouwman, J.
We investigate the dust composition of detached shells around carbon stars, with a focus to understand the origin of the cool magnesium-sulfide (MgS) material around warm carbon stars, which has been detected around several of these objects \citep{2002A&A...390..533H}. We build a radiative transfer model of a carbon star surrounded by an expan…
Multi-Wavelength Observations of an Unusual Impulsive Flare Associated with Cme
Uddin, Wahab; Chandra, Ramesh; Jain, Rajmal +5 more
We present the results of a detailed analysis of multi-wavelength observations of a very impulsive solar flare 1B/M6.7, which occurred on 10 March, 2001 in NOAA AR 9368 (N27 W42). The observations show that the flare is very impulsive with a very hard spectrum in HXR that reveal that non-thermal emission was most dominant. On the other hand, this …
Me 1-1: A PN containing a cool star
Liu, X. -W.; Danziger, I. J.; Shen, Z. -X.
We report the detection of a cool stellar component at the center of the planetary nebula (PN) Me 1-1 and present optical spectra of the system. From measurements of nebular emission lines, we have derived electron temperature, density and chemical composition. Heavy elemental abundances deduced from collisionally excited lines (CELs) are compared…
308 Polyxo: ISO-SWS spectrum up to 26 micron
Barucci, M. A.; Dotto, E.; Müller, T. G. +2 more
Infrared spectroscopic observations of the asteroid 308 Polyxo have been carried out by the Infrared Space Observatory (ISO) with the Short Wavelength Spectrometer (SWS) in the spectral region between 7 and 26 µm. The Standard Thermal Model and the Thermophysical Model have been applied to the obtained data in order to model the thermal cont…
Multi-scale analysis of turbulence in the Earth's current sheet
Balogh, A.; Glassmeier, K.; Klecker, B. +8 more
Available from http://www.copernicus.org/site/EGU/annales/22/7/2525.htm?FrameEngine=false;
Evidence for magnetic reconnection in the high corona
Simnett, G. M.
The LASCO C2 coronagraph on the SOHO spacecraft shows many examples of oppositely-directed mass flows along the same (projected) radius vector. We have analysed 40 such events to understand their origin and possible physical cause. The events all had the speed of the outflowing feature higher than that of the inflowing feature. This is interpreted…
The Galaxy Density Environment of Gamma-Ray Burst Host Galaxies
Minniti, Dante; Bornancini, Carlos G.; Martínez, Héctor J. +3 more
We analyze cross-correlation functions between gamma-ray burst (GRB) hosts and surrounding galaxies. We have used data obtained with the Very Large Telescope at Cerro Paranal (Chile), as well as public Hubble Space Telescope data. Our results indicate that GRB host galaxies do not reside in high galaxy density environments. Moreover, the host gala…
Cluster observations of mid-latitude hiss near the plasmapause
Santolík, O.; Décréau, P.; Masson, A. +2 more
Available from http://www.copernicus.org/site/EGU/annales/22/7/2565.htm?FrameEngine=false;