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X-Ray Formation Mechanisms in Massive Binary Systems

Antokhin, I. I.

Massive, hot, luminous stars of types O, early B and WR have strong supersonic radiatively driven winds. Both single and binary early-type stars are known X-ray emitters. According to current understanding of X-ray formation mechanisms in the winds of single and binary early-type massive stars, binaries should be harder and more luminous X-ray sou…

Inverse reconstruction technique based on time-dependent Petschek-type reconnection model: first application to THEMIS magnetotail observations

Ivanova, V.; Liu, J.; Semenov, V. +2 more

We apply the inverse reconstruction technique based on the two-dimensional time-dependent Petschek-type reconnection model to a dual bipolar magnetic structure observed by THEMIS B probe in the Earth's magnetotail during a substorm on 22 February 2008 around 04:35 UT. The technique exploits the recorded bipolar magnetic field variation as an input…

Ejection and descent of matter in the solar atmosphere

Divlekeev, M. I.

The descent and ejection of matter in the solar atmosphere observed in the CaII 8498-Å line have been studied. In the NOAA active region no. 10 792 on July 30, 2005 before the flare, the dense cold gas cloud descended with a ray velocity of ∼8 km/s and then ascended in the impulsive phase. The plasma ascended with an acceleration reaching 0.4 km/s…

Star formation in NGC5471

Pérez, Enrique; Cerviño, Miguel; Díaz, Ángeles I. +2 more

We present a study of the star formation in the giant HII region NGC5471 in the outskirts of M101. We have performed integrated photometry of the mean emission knots. Stellar population analysis with the code chorizos is compatible with the hypothesis that these regions have at least two different populations. The color–magnitude diagram of the re…

Measuring Cosmic Elements with Gamma-Ray Telescopes

Diehl, Roland

Gamma-ray telescopes are capable of measuring radioactive trace isotopes from cosmic nucleosynthesis events. Such measurements address new isotope production rather directly for a few key isotopes such as ⁴⁴Ti, ²⁶Al, ⁶⁰Fe, and ⁵⁶Ni, as well as positrons from the β⁺-decay variety. Experiments o…

The evolution of star clusters: the resolved-star approach

Calzetti, Daniela; Pellerin, Anne; Harris, Jason +1 more

We present the first results of a new technique to detect, locate, and characterize young dissolving star clusters. Using Hubble Space Telescope/Advanced Camera for Surveys archival images of the nearby galaxy IC2574, we performed stellar PSF photometry and selected the most massive stars as our first test sample. We used a group-finding algorithm…

Tsallis distribution of the interplanetary magnetic field at 0.72 AU: Venus Express observation

Zhang, T. L.; Wang, C.; Li, X. Y.

Previous work shows that Probability Distribution Functions (PDFs) of the interplanetary magnetic field strength differences can be described by a single function - Tsallis distribution at Earth and beyond. Launch of Venus Express enables us to extend the application of Tsallis distribution to the inner heliosphere at 0.72 AU. This paper analyzes …

Erratum: Erratum to: ``Evolutionary Characteristics of the Orbits of Outer Saturnian, Uranian, and Neptunian Satellites''

Vashkov'yak, M. A.; Teslenko, N. M.

Another giant leap for mankind

Spudis, Paul D.

Three spacecraft are currently orbiting the Moon, Chang'e-1 from China, Kaguya from Japan and Chandrayaan-1 from India. The American Lunar Reconnaissance Orbiter will join them later this year. Russia is developing lunar rover hardware, for itself and for other countries. In Europe, both Germany and the UK are contemplating their own lunar mission…

European Mars Science and Exploration Conference (EMSEC)

Witasse, Olivier; Rossi, Angelo Pio