Discovery of the oldest brown dwarf seen in our galaxy | fr584's Blog

The oldest stars in our galaxy are characterised by very low ‘metal’ (i.e. elements other than hydrogen and helium) content since they formed over 10 Myr ago when the interstellar medium contained far fewer heavy elements released from previous stars.  The object had been identified as a possible member of the old ‘halo’ population by its proper motion.  Measurements of its distance using trigonometric parallax imply that one of these halo stars is so intrinsically faint it must be a brown dwarf.


Posted by fr584 at 06:44 on July 8th, 2009 at 6:44AM  
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