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 ...

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...

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....

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...

We present a short re–evaluation of a recently published time delay estimate for the gravitational lens system HE 1104–1805 with emphasis on important methodological aspects: bias of the statistics, inconsistency of the methods and use of the purposeful selection of data points (or so–called " cleaning ") at the preprocessing stage. We show how the inadequate use of simple analysis methods can ...

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mirza abdollah afandi, the son of mirza eisa was one of the most famous authors and scholars in 11th and 12th century. someone has named he tabrizi, jeirani, esfahani and … he was a tourist in a half of his life time and in addition to iran cities, he had traveled to rome, turkey, syria, egypt, arabia, bahrain and … he observed libraries of those countries and profited the knowledge of the scho...