منابع مشابه
Asteroseismology of Cepheids
The importance of Cepheids is well known in many fields of astronomy. In this contribution I would like to show how it is possible to obtain indications about the internal structure of a Cepheid and how we can test models of this class of variable stars. Section 2 introduces the Fourier decomposition, a tool to describe quantitatively the light curves of pulsating stars. In the past years I hav...
متن کاملCepheids: Pulsation, Evolution, Opacity
We describe modeling of the ''beat'' and "bump" Cepheids, using the new radiative opacities. Discrepancies between these models and the evolutionary tracks for stars of appropriate mass are discussed. Finally, we point out some of the difficulties involving the long-period Cepheid sample with periods greater than 20 days.
متن کاملPhotometry of 40 LMC Cepheids
We present V and Ic CCD photometry for 40 LMC Cepheids at 1 to 3 epochs. This represents a significant increase in the number of LMC Cepheids with I-band data, and, as we show, is a useful addition to the sample which can be used to calibrate the period–luminosity relations in these important bands.
متن کاملLifelong companions
The life of an RNA molecule is complicated. Once a newly synthesized eukaryotic RNA has emerged from the RNA polymerase in the nucleus, it will be processed, spliced, and exported into cytoplasm. In prokaryotes, transcribed RNA is synthesized directly in the cytoplasm. RNA molecules that serve as mRNAs have to be kept devoid of local structures that are inhibitory for ribosome scanning and tran...
متن کاملArtificial Companions
The paper concerns the closely related topics of the possibility of machines having identifiable personalities, and the possible future legal responsibilities of machines. As will become clear, I wish to explore these topics in terms which are basically those of computational linguistics; and by ‘machines’ here, I intend software entities, rather than robots, and in particular the sort of softw...
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ژورنال
عنوان ژورنال: Publications of the Astronomical Society of the Pacific
سال: 1964
ISSN: 0004-6280,1538-3873
DOI: 10.1086/128044