Elisabetta Caffau (Observatoire de Paris/Meudon)

The first generations of stars
When Nov 13, 2014 from 02:00 PM to 03:00 PM
What
  • Special Seminar
  • Colloquium
Where SH Lecture Hall
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Extremely metal-poor (EMP) stars are the descendents of the massive stars of the first stellar generation. Their chemical composition reflects the early phases of the Universe: on one side, it puts constraints on the masses of these first-generation massive stars, and on the other side it allows us to better understand the formation of low-mass stars from a gas cloud depleted in metals. EMP stars are are a minor component of the present stellar population (about one thousandth) and special efforts are required to find them. We exploited the Sloan Digital Sky Survey to search for EMP candidates with the colors of turn-off stars. We subsequently observed them at medium- and high-resolution to derive their chemical composition.