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2018 Hot Sci @ STScI

Globular Cluster Diaspora: Properties of Helium-enriched Stars in the Field

Presented by: David Nataf (Johns Hopkins University)
Category: Science Colloquia   Duration: 30 minutes   Broadcast date: June 20, 2018
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Stars which are enriched in nitrogen, sodium, and aluminium, but deficient in carbon and oxygen have previously been classified as “second-generation” globular cluster stars. They have recently been found in the field as well, and thus may prove to be a tracer of star formation at the earliest epochs of Milky Way assembly. Recent developments in this area include tracing of these abundance variations over a number of species, and in different components of the Galaxy. I discuss my own investigation of this globular cluster diaspora in the Galactic bulge, where I chart the distribution and number density of these stars in multidimensional abundance space using precision spectroscopic measurements. I explore the question of whether or not the globular cluster diaspora in the bulge is composed of stars from former massive, intermediate, or lower-mass globular clusters.