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This review surveys hard X-ray emissions of non-thermal electrons in the solar corona. These electrons originate in flares and flare-related processes. Hard X-ray emission is the most direct diagnostic of electron presence in the corona, and such observations provide quantitative determinations of the total energy in the non-thermal electrons. The most intense flare emissions are generally obse...
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We present the first results of the analysis of data collected during the 1998-99 observational campaign at the 1.3 meter McGraw-Hill Telescope, towards the Andromeda galaxy (M31), aimed to the detection of gravitational microlensing effects as a probe of the presence of dark matter in our and in M31 halo. The analysis is performed using the pixel lensing technique, which consists in the study ...
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ASTRONOMY AND ASTROPHYSICS HV Ursae Majoris, a new contact binary with early-type components ⋆ Abstract. We present the first U BV and uvby photomet-ric observations for the short period variable star HV Ur-sae Majoris classified as a field RRc variable. The observed differences between the consecutive minima and the lack of colour variations disagree with the RRc-classification and suggest the...
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We present CCD uvbyβ photometry for stars in the nuclei of the young double cluster h and χ Persei. We find that the reddening is highly variable through the h Per nucleus, increasing from west to east, with values ranging from E(b − y) = 0.328 ± 0.022 in the western part to E(b − y) = 0.465 ± 0.024 in the southeast. Towards χ Per the reddening is fairly constant, with E(b − y) = 0.398 ± 0.025....
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We have derived the galaxy luminosity function (GLF) in the cluster of galaxies Abell 496 from a wide field image in the I band. A single Schechter function reproduces quite well the GLF in the 17≤ IAB ≤22 (−19.5 ≤ MI ≤ −14.5) magnitude interval, and the power law index of this function is found to be somewhat steeper in the outer regions than in the inner regions. This result agrees with the i...
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ژورنال
عنوان ژورنال: The Astronomy and Astrophysics Review
سال: 2011
ISSN: 0935-4956,1432-0754
DOI: 10.1007/s00159-011-0036-6