We report the variations of the UV spectrum of BP Tau from 5 to 19 January, 1992 when the star was monitored with IUE during 2 rotation periods. Our data indicate that lines that can be excited by recombination processes, such as those from O I and He II have periodic-like light curves, whereas lines that are only collisionally excited do not

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This book provides a unique review of our current understanding in astronomy and cosmology, and a host of ideas for profitable future research.

The Universe at Large presents a unique survey of key questions outstanding in contemporary astronomy and cosmology. In this timely volume, eleven of the world's greatest living astronomers and cosmologists present their personal views of what problems must be addressed by future research. Allan Sandage presents a 23-point plan to reach a full

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