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A quantitative test of Jones NTC beaming theory using CLUSTER constellation
Grimald, S.; Décréau, P. M. E.; Canu, P. +4 more
Non-thermal continuum (NTC) radiation is, with auroral kilometric radiation (AKR), one of the two electromagnetic emissions generated within the Earth's magnetosphere and radiated into space. The location of the source of NTC has been sought for several decades, with only limited success. The constellation formed by the four CLUSTER spacecraft pro…
Accurate masses of low mass stars GJ 765.2AB (0.83 M⊙ + 0.76 M⊙)
Weigelt, G.; Schertl, D.; Ségransan, D. +10 more
Context: Because of the lack of precise masses, the coverage of the main-sequence empirical mass-luminosity relation for stars in the mass range from 0.6 M⊙ to 0.9 M⊙ is incomplete. The nearby K-type visual and spectroscopic binary GJ 765.2 = MLR 224 is a good candidate for new reliable points in this significant part of the …
Infrared study of the extreme carbon stars based on IRAS, 2MASS and ISO data
Chen, Pei-Sheng; Shan, Hong-Guang
We collected 55 galactic extreme carbon stars from the published literature in this paper. Observational data from IRAS, 2MASS and ISO were analyzed. The results show that the infrared properties of extreme carbon stars are quite different to those for ordinary visual carbon stars. It is shown from IRAS and 2MASS photometric data that extreme carb…
The star formation histories of elliptical galaxies across the Fundamental Plane
Dunlop, J. S.; Jimenez, Raul; Heavens, A. +3 more
We present the first results from a study designed to test whether, given high-quality spectrophotometry spanning the mid-ultraviolet-optical wavelength regime, it is possible to distinguish the metal content and star formation history of individual elliptical galaxies with sufficient accuracy to establish whether their formation history is linked…
UV flux distributions of γ Doradus stars
Caffau, E.; Gerbaldi, M.; Faraggiana, R.
Context: It seems that the recently identified class of pulsating stars, the γ Dor type-variables, includes objects with different metal abundances and a large percentage of binaries.
Aims: We looked for indicators of metal abundance peculiarities and stellar binarity in a sample of 40 confirmed γ Dor stars.
Methods: Absolute magnitudes fr…
Surface evolution of Venus
Basilevsky, Alexander T.; McGill, George E.
This chapter contains short descriptions of material units and structures observed on the surface of Venus as well as an abbreviated history of discoveries, that led to the current knowledge of this planet's geology. It is shown that observed units and structures are broadly similar and commonly exhibit similar age sequences in different regions o…
Jitter Correction Algorithms for the COROT Satellite Mission: Validation with Test Bench Data and MOST On-Orbit Photometry
Auvergne, M.; Drummond, R.; Aerts, C. +5 more
We demonstrate the effectiveness and robustness of photometric correction algorithms for satellite pointing jitter in the upcoming space mission COROT, which will study asteroseismology and search for exoplanets. Two algorithms based on model-based estimation and decorrelation are tested in two ways: (1) with artificial light sources in the COROT …
Radio burst from converging separatrices
Mann, G.; Aurass, H.; Rausche, G.
Context: In a previous paper on the X17 flare October 28, 2003, we found, among other radio flare sources, one displaced at ≈0.2 R_⊙ north of the flaring AR 10486, away from the main Hα and hard X-ray flare emission. The source came to our attention due to its timing, its spatial displacement from the flaring active region, and due to the behavior…
Optical detection of the radio supernova SN 2000ft in the circumnuclear region of the luminous infrared galaxy NGC 7469
Panagia, N.; Colina, L.; Díaz-Santos, T. +4 more
Context: (Ultra)Luminous Infrared Galaxies (ULIRGs) produce massive stars in large quantities in their central starburst regions. The expected rate of supernova explosions is, on average, about one per year. Detection of these supernovae in the expected numbers has proven elusive so far.
Aims: Illustrate the general benefits and limitations of…
Spectral variability analysis of an XMM-Newton observation of Ark 564
Papadakis, I. E.; Brinkmann, W.; Raeth, C.
Context: We present a spectral variability analysis of the X-ray emission of the Narrow Line Seyfert 1 galaxy Ark 564 using the data from a ~100 ks XMM-Newton observation.
Aims: Taking advantage of the high sensitivity of this long observation and the simple spectral shape of Ark 564, we determine accurately the spectral variability patterns i…