منابع مشابه
The metallicity dependence of the Cepheid PL-relation
A sample of 37 Galactic, 10 LMC and 6 SMC cepheids is compiled for which individual metallicity estimates exist and BV IK photometry in almost all cases. The Galactic cepheids all have an individual distance estimate available. For the MC objects different sources of photometry are combined to obtain improved periods and mean magnitudes. A multiparameter Period-Luminosity relation is fitted to ...
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Geometric characteristics of 2-manifolds embedded in R space have been analyzed from the point of view of differential geometry and topology. In the past, results relevant to these areas have been found for C curves and surfaces. However, current scientific, industrial, entertainment and medical applications, and availability of more powerful point sampling systems, press for characterization o...
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Many recently proposed sensornet applications require large number of sensor nodes operating over long periods of time. In contrast to the first-generation sensornet deployments, these applications involve sophisticated internode communication rather than simple tree-based data collection. The examples include network maintenance, data-centric storage, object tracking, and various query engines...
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The condition based approach identifies sets of input vectors, called conditions, for which it is possible to design a protocol solving a distributed problem despite process crashes. This paper investigates three related agreement problems, namely consensus, interactive consistency, and k-set agreement, in the context of the condition-based approach. In consensus, processes have to agree on one...
متن کاملA study using galaxies with distances from the Cepheid PL-relation
Cepheid distances of local galaxies (< 7 Mpc) are used to study the very nearby velocity field, as pioneered by Sandage (1986) who also pointed out its remarkable properties: linearity and quietness. The new data show that the velocity dispersion in the distance range as seen from the barycentre of the Local Group 1 − 8 Mpc is as low as 38 km s. The local rate of expansion coincides with the gl...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1999
ISSN: 0074-1809
DOI: 10.1017/s0074180900204518