Search Publications
Period change of massive binaries from combined photometric and spectroscopic data in Cygnus OB2
Tuvikene, Taavi; Tempel, Elmo; Eenmäe, Tõnis +2 more
Context. Mass loss is an important property in evolution models of massive stars. As up to 90% of the massive stars have a visual or spectroscopic companion and many of them exhibit mass exchange, mass-loss rates can be acquired through studying the period of massive binaries.
Aims: Using our own photometric observations as well as archival d…
Investigating early-type galaxy evolution with a multiwavelength approach - I. X-ray properties of 12 galaxies observed with Swift and XMM-Newton
Wolter, A.; Marino, A.; Trinchieri, G. +2 more
We report here the results from the X-ray observations of 12 early-type galaxies (ETGs) observed with Swift and XMM-Newton, originally selected from a sample of galaxies with Spitzer and/or GALEX data. With the combined analysis of new X-ray and optical-UV observations and of previously available data from archives, we aim at investigating the rel…
Electron density and parallel electric field distribution of the auroral density cavity
Karlsson, T.; Marklund, G. T.; Alm, L.
We present an event study in which Cluster satellites C1 and C3 encounters the flux tube of a stable auroral arc in the premidnight sector. C1 observes the midcavity, while C3 enters the flux tube of the auroral arc at an altitude which is below the acceleration region, before crossing into the top half of the acceleration region. This allows us t…
Mapping Mars: Geodetic and cartographic aspects
Statella, Thiago
This paper presents a review of geodetic and cartographic aspects involved in the mapping of Mars and in the handling of planetary data returned and available from different team missions. It focuses on the reference system adopted for the planet, the main coordinate systems being used and main projection systems adopted when representing the data…
Indian Mars-Colour-Camera captures far-side of the Deimos: A rarity among contemporary Mars orbiters
Chauhan, Prakash; Arya, A. S.; Manthira Moorthi, S. +10 more
Mars and Deimos are tidally locked so one would always get to view the same side of Deimos from Mars. Most of the contemporary functional satellites orbiting Mars viz. Mars Reconnaissance Orbiter , Mars Express, Mars Odyssey, MAVEN etc. are positioned between Mars and Deimos, hence they always view only one side of Deimos i.e the Mars-side, while …
G305.136+0.068: A Massive and Dense Cold Core in an Early Stage of Evolution
Pineda, Jaime E.; Garay, Guido; Mardones, Diego +3 more
We report molecular line observations, made with ASTE and SEST, and dust continuum observations at 0.87 mm, made with APEX, toward the cold dust core G305.136+0.068. The molecular observations show that the core is isolated and roughly circularly symmetric and imply that it has a mass of 1.1 × 103 M ⊙. A simultaneous model fi…
X-rays from the episodic dust maker WR 137
Zhekov, Svetozar A.
We present an analysis of the XMM-Newton observation of the episodic dust maker WR 137. Global spectral fits show that its X-ray spectrum is well matched by a two-temperature optically-thin plasma emission (kT1 ∼ 0.4 keV and kT2 ∼ 2.2 keV). If we adopt the colliding stellar wind (CSW) picture for this wide WR+O binary, the th…
Dawn-dusk asymmetry in bursty hot electron enhancements in the midtail magnetosheath
Wang, Chih-Ping; Nakamura, T. K. M.; Lyons, Larry R. +1 more
Bursty (a few minutes) enhancements of hot electrons (1-10 keV) in the tail magnetosheath, which we name hot electron enhancements (HEEs), are sometimes observed. To understand the processes leading to HEEs, we have used 4 years of measurements from Acceleration Reconnection Turbulence and Electrodynamics of Moon's Interaction with the Sun mission…
Magnetic fields near spacecraft-explored comets: 3D MHD numerical simulation
Baranov, V. B.; Alexashov, D. B.; Lebedev, M. G.
The magnetohydrodynamic (MHD) model of the interaction between the solar wind and a cometary ionosphere is presented. The model accounts for photoionization of the neutral component of the cometary outflow and the resonance charge exchange between charged and neutral particles, together with the interplanetary magnetic field. The numerical impleme…
Total Solar Irradiance Monitor for the FY-3B Satellite - Space Experiments and Primary Data Corrections
Wang, Hongrui; Li, Huiduan; Qi, Jin +1 more
We present space experiments of the Total Solar Irradiance Monitor (TSIM) on the FY-3B satellite. The total solar irradiance (TSI) has been measured by TSIM/FY-3B continuously for nearly four years, with some short data gaps. Overlapping measurements of the TSI are provided by the TSIM, with three electrical substitution radiometers that are mount…