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Frank Grundahl

Precision Chemical Abundance Measurements

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  • David Yong, Research School of Astronomy and Astrophysics, The Australian National University, Weston, ACT 2611, Australia yong@mso.anu.edu.au
  • ,
  • Frank Grundahl
  • Jorge Meléndez, Departamento de Astronomia do IAG/USP, Universidade de Sao Paulo, Rua do Matao 1226, Sao Paulo, 05508-900, SP, Brasil
  • ,
  • John E. Norris, Research School of Astronomy and Astrophysics, The Australian National University, Weston, ACT 2611, Australia yong@mso.anu.edu.au
This talk covers preliminary work in which we apply a strictly differential line-by-line chemical abundance analysis to high quality UVES spectra of the globular cluster NGC 6752. We achieve extremely high precision in the measurement of relative abundance ratios. Our results indicate that the observed abundance dispersion exceeds the measurement uncertainties and that many pairs of elements show significant correlations when plotting [X1/H] vs. [X2/H]. Our tentative conclusions are that either NGC 6752 is not chemically homogeneous at the ~=0.03 dex level or the abundance variations and correlations signify star-to-star He abundance variations.
Original languageEnglish
JournalProceedings of the International Astronomical Union
Volume10
Pages (from-to)237-238
ISSN1743-9213
DOIs
Publication statusPublished - 1 Jan 2012

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