What Does the Helium Abundance in Young Stars Tell Us About the Universe?

Details What Does the Helium Abundance in Young Stars Tell Us About the Universe? What Does the Helium Abundance in Young Stars Tell Us About the Universe?

Jun 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977msngr...9...11w&link_type=abstract

The Messenger, vol. 9, p. 11-12

Physics

Scientific paper

Surely, Algol systems and W UMa stars are evenly distributed over the whole sky, and close binaries with circumstellar matter in their surroundings can therefore be observed from the northern as well as from the southern hemisphere. But the number of really outstanding eclipsing variables of this kind----like U Cep with its strange light-curve outside the eclipses, which has been known since the days of Dugan, and with its spectral peculiarities-is not large, and it may therefore be considered very worthwhile to test southern eclipsing binaries in the hope of discovering new, particularly interesting systems. Let us first consider the systems of Algol type, i. e. systems in which the light minima are well defined and the light-curve outside the minima is reasonably flat; the prototype is ß Persei, also called Algol.

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