The Vatican Observatory Summer Schools in Observational Astronomy and Astrophysics
نویسندگان
چکیده
منابع مشابه
Astronomy and Astrophysics Iii. Observational Guidelines for Mode Identification
On the basis of almost 2000 b, y photoelectric observations of θ Tucanae collected in an international campaign at two sites and of almost 1500 v, u observations collected at one site, observational guidelines for mode identification have been searched. Not only the generally used plane (Ab−y/Ay versus φb−y φy) but each combination of the nonadiabatic observables including amplitude ratio vs. a...
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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....
متن کاملAstronomy and Astrophysics
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: Transactions of the International Astronomical Union
سال: 2001
ISSN: 0251-107X
DOI: 10.1017/s0251107x00000511