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SUMMARY:A Search for Very Old Stars - Jayant Narlikar (IUCAA)
DTSTART:20100602T124500Z
DTEND:20100602T131500Z
UID:TALK24367@talks.cam.ac.uk
CONTACT:Dr Jonathan Gair
DESCRIPTION:This seminar will describe a joint work by Vijay Mohan\, Nando
  Patat\, Ken Freeman and the speaker to look for stars around 20 Gyr old. 
 The cosmological significance of such a search will be described first\, i
 ncluding an alternative cosmology which allows arbitrarily old stars to ex
 ist. The search for old stars is carried out in the LMC and colour magnitu
 de diagrams of stars are used to estimate their ages. A group of stars pos
 sibly lying close to a subgiant branch of the CMD is identified as likely 
 old stars. Alternative explanations of this group in terms off younger sys
 tems are discussed and future tests are proposed to decide between these a
 lternatives.
LOCATION:Sackler Lecture Theatre\, IoA
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