Resultado do CfA-Harvard publicado hoje na revista Nature: A spin-down clock for cool stars from observations of a 2.5-billion-year-old cluster Søren Meibom et al. 2015 nature/nature/journal/vaop/ncurrent/full/nature14118.html The team then evaluated several existing computer models that calculate the spin rates of stars based on their masses and ages, and determined which model best matched their observations. Now we can derive precise ages for large numbers of cool field stars in our Galaxy by measuring their spin periods, states Meibom. This is an important new tool for astronomers studying the evolution of stars and their companions, and one that can help identify planets old enough for complex life to have evolved. This work was first published online on the website of the journal Nature on January 5, 2015. It is part of the broader Kepler Cluster Study, for which Meibom is the principal investigator. More information is available at: https://cfa.harvard.edu/~smeibom/. Headquartered in Cambridge, Mass., the Harvard-Smithsonian Center for Astrophysics (CfA) is a joint collaboration between the Smithsonian Astrophysical Observatory and the Harvard College Observatory. CfA scientists, organized into six research divisions, study the origin, evolution and ultimate fate of the universe. Stars Spins Reveal Their Ages Monday, January 5, 2015 - 1:15pm Our goal is to construct a clock that can measure accurate and precise ages of stars from their spins. Weve taken another significant step forward in building that clock, says Soren Meibom of the Harvard-Smithsonian Center for Astrophysics (CfA). cfa.harvard.edu/news/2015-01 Matthieu Castro, Jefferson Costa, Tharcísyo, Bruno Moura, Salvador
Posted on: Mon, 05 Jan 2015 19:41:41 +0000
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