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A compact flare eclipsed in the corona of SV Camelopardalis
Sanz-Forcada, J.; Micela, G.; Favata, F.
The eclipsing active binary SV Cam (G0V/K6V, Porb=0.593071 d) was observed with XMM-Newton during two campaigns in 2001 and 2003. No eclipses in the quiescent emission are clearly identified, but a flare was eclipsed during the 2001 campaign, allowing us to strongly constrain, from purely geometrical considerations, the position and siz…
Transition region counterpart of a moving magnetic feature
Doyle, J. G.; Banerjee, D.; O'Shea, E. +1 more
Context: .While moving magnetic features have been studied extensively at the photospheric level, the effect they have on the upper atmosphere remains largely unknown, and it is this which we seek to address in this work.
Aims: .In this work we aim to investigate the chromospheric and transition-region dynamics associated with a moving magneti…
GOODS spitzer IRAC observations of high- z galaxies - Implications for reionization
Ouchi, Masami; Papovich, Casey; Dickinson, Mark +11 more
A significant number of Lyman-break galaxies (LBGs) at z ≈ 6 and 5 in the Hubble Ultradeep Field (HUDF) have been detected by the Great Observatories Origins Deep Survey (GOODS) observations with the Infrared Array Camera (IRAC) on the Spitzer Space Telescope. We find that the SEDs for many of these IRAC-detected high- z galaxies are best fitted b…
The Algol System XX Cephei
Angione, Ronald J.; Sievers, John R.
We present new five-color photometric and spectroscopic observations of the Algol system XX Cephei (V=9.13, P=2.3 days). This system is known to have a variable period. From analysis of both the period variations and the light curve we found no support for apsidal motion. However, there is a possible light-time effect. The period changes could als…
Radiative heating predictions for Huygens entry
Magin, T. E.; Caillault, L.; Bourdon, A. +2 more
Radiative heat flux predictions for the Huygens probe entry into Titan's atmosphere are presented in this paper. Radiative heating was computed with the radiation code SPECAIR, assuming a Boltzmann distribution of the excited electronic levels at a characteristic temperature taken as the vibrational temperature of the gas. CN violet is found to be…
First Results from the XMM-Newton Slew Survey
Altieri, Bruno; Read, Andrew; Saxton, Richard +2 more
We have attempted to analyse all the available data taken by XMM-Newton as it slews between targets. This slew survey, the resultant source catalogue, and the analysis procedures used are described in an accompanying paper. In this letter we present the initial science results from the survey. To date, detailed source searching has been performed …
Lithium abundances for early F stars: new observational constraints for the Li dilution
Recio-Blanco, A.; de Laverny, P.; de Medeiros, J. R. +2 more
Aims.To investigate any correlation between Li abundances and rotational velocities among F-G evolved stars, we study a large sample of early F stars from the Bright Star Catalogue (BSC), most of them classified in the literature as giant stars.
Methods.Physical parameters and Li abundances are estimated for each star, often for the first time,…
On the dynamical stability of the Rosetta orbiter. I.
Mysen, E.; Aksnes, K.
The Rosetta probe is to monitor, from a bound orbit, its primary target comet 67P/Churyumov-Gerasimenko for extended periods of time. As a preliminary assessment of the challenges involved, the strengths of the effects which perturb the spacecraft's cometocentric Keplerian trajectory are evaluated. It is found that in our adopted nominal scenario,…
Improvement of Hipparcos Proper Motions in Declination
Damljanovic, G.; Pejovic, N.; Jovanovic, B.
More than a decade elapsed after the HIPPARCOS ESA mission (ESA 1997) observations have been collected. This first astronomical satellite mission was less than 4 years long so that 1991.25 is the epoch of the HIPPARCOS Catalogue. Many other projects have checked or improved HIPPARCOS data. Also, a long series of ground - based optical observations…
Characteristics of merging at the magnetopause inferred from dayside 557.7-nm all-sky images: IMF drivers of poleward moving auroral forms
Winningham, J. D.; Balogh, A.; Farrugia, C. J. +10 more
We combine in situ measurements from Cluster with high-resolution 557.7 nm all-sky images from South Pole to investigate the spatial and temporal evolution of merging on the dayside magnetopause. Variations of 557.7 nm emissions were observed at a 6 s cadence at South Pole on 29 April 2003 while significant changes in the Interplanetary Magnetic F…