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Doppler redistribution of anisotropic radiation and resonance polarization in moving scattering media. Predicted results for the coronal O VI 1032 Å line
Raouafi, N. -E.; Sahal-Bréchot, S.
The present paper puts the Doppler redistribution theory of anisotropic radiation and resonance polarization in moving scattering media into a predictive application following Sahal-Bréchot et al. (1998, A&A, 340, 579; P{{II}}), using the example of the O VI 1032 Å line of the corona. Numerical results are presented for different heights over …
X-ray variability of NGC 2516 stars in the XMM-Newton observations
Micela, G.; Peres, G.; Marino, A. +1 more
We present the characteristics of the X-ray variability of stars in the cluster NGC 2516 as derived from XMM-Newton/EPIC/pn data. The X-ray variations on short (hours), medium (months), and long (years) time scales have been explored. We detected 303 distinct X-ray sources by analysing six EPIC/pn observations; 194 of them are members of the clust…
Time-Distance Measurements of Cross-Correlation Asymmetries around NOAA AR 10486
Thompson, Michael J.; Jensen, Jesper M.; Pijpers, Frank P.
We apply time-distance helioseismology to NOAA AR 10486 in order to examine the effect the presence of magnetic fields has on the resulting cross-correlations. Large-amplitude asymmetries between waves propagating in opposite directions are observed. The asymmetries can be attributed to suppression and absorption of seismic waves by the magnetic f…
Models of the protosatellite disk of Saturn: Conditions for Titan's formation
Dorofeeva, V. A.; Makalkin, A. B.
Models of the protosatellite accretion disk of Saturn are developed that satisfy cosmochemical constraints on the volatile abundances in the atmospheres of Saturn and Titan with due regard for the data obtained with the Cassini orbiter and the Huygens probe, which landed on Titan in January 2005. All basic sources of heating of the disk and protos…
The soft and hard X-ray emission of 3C 273 from 1996 to 2004 with BeppoSAX and XMM-Newton
Staubert, R.; Deluit, S. J.; Stuhlinger, M.
We present the results of a long monitoring of the quasar 3C 273 with BeppoSAX (1996 2001) and XMM-Newton (2000 2004). Our dataset is composed of nine BeppoSAX and 15 XMM observations for a total exposure time of 855 ks (∼492 ks for BeppoSAX and ∼363 ks for XMM). In the soft X-ray domain, we investigate the 2 10 keV continuum with MECS and PN and …
FH Leonis, the first dwarf nova member of a multiple star system?
Vogt, N.
Aims.Sudden brightenings of HD 96273 or BD+07 2411B were observed with the HIPPARCOS satellite in 1992, which still require a convincing explanation.
Methods: .A new analysis of all known data of these two stars is given, including additional information on the Balmer line equivalent widths.
Results: .The brightenings can be explained as S…
SMA gas release mechanism for the Rosetta Lander's Ptolemy instrument
Sawyer, Eric; Edeson, Ruben; Whalley, Martin +2 more
The Ptolemy instrument on the Rosetta comet lander “Philae” is an advanced gas analyser. The instrument relies on a supply of ultra-clean helium gas to carry cometary matter through a series of gas chromatography columns and high temperature reactors, into a mass spectrometer. The helium is stored in a pair of titanium gas tanks, pressurised to 50…
CME-associated dimmings on the Sun observed with the EUV SPIRIT telescope on the CORONAS-F spacecraft
Slemzin, V.; Kuzin, S.; Chertok, I. +5 more
Based on observations with the EUV SPIRIT telescope aboard the CORONAS-F spacecraft, we analyze large-scale dimmings on the solar disk initiated by halo-type coronal mass ejections (CMEs). We address four powerful geo-effective eruptive events of November 4, 2001; October 28, 29, and November 18, 2003. The SOHO/EIT telescope did not observe the fi…
Development of a low energy ion source for ROSINA ion mode calibration
Altwegg, Kathrin; Balsiger, Hans; Rubin, Martin +1 more
The European Rosetta mission on its way to comet 67P/Churyumov-Gerasimenko will remain for more than a year in the close vicinity (1 km) of the comet. The two ROSINA mass spectrometers on board Rosetta are designed to analyze the neutral and ionized volatile components of the cometary coma. However, the relative velocity between the comet and the …
Composite spectra Paper 14: HR 1129, a long-period binary showing evidence of circumbinary material
Stickland, D. J.; Griffin, R. E. M.; Griffin, R. F.
HR 1129 is a 4.8-mag star in the constellation Camelopardus, strangely (in view of its brightness) lacking a constellation designation. It has long been known to exhibit a composite spectrum consisting of a late-type primary and an early-type secondary. The radial velocity of the primary is easily measured, and was announced as variable nearly 100…