Precision Chemical Abundance Measurements

David Yong; Frank Grundahl; Jorge Meléndez; John E. Norris

doi:10.1017/S1743921314005572

Precision Chemical Abundance Measurements

David Yong, Frank Grundahl, Jorge Meléndez, John E. Norris

Research output: Contribution to journal › Article › peer-review

Abstract

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 language	English
Pages (from-to)	237-238
Number of pages	2
Journal	Proceedings of the International Astronomical Union
Volume	10
Issue number	H16
DOIs	https://doi.org/10.1017/S1743921314005572
Publication status	Published - 2012

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title = "Precision Chemical Abundance Measurements",

abstract = "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.",

keywords = "Stars: abundances, globular clusters: individual: NGC 6752",

author = "David Yong and Frank Grundahl and Jorge Mel{\'e}ndez and Norris, {John E.}",

note = "Publisher Copyright: {\textcopyright} 2015 International Astronomical Union.",

year = "2012",

doi = "10.1017/S1743921314005572",

language = "English",

volume = "10",

pages = "237--238",

journal = "Proceedings of the International Astronomical Union",

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TY - JOUR

T1 - Precision Chemical Abundance Measurements

AU - Yong, David

AU - Grundahl, Frank

AU - Meléndez, Jorge

AU - Norris, John E.

PY - 2012

Y1 - 2012

N2 - 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.

AB - 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.

KW - Stars: abundances

KW - globular clusters: individual: NGC 6752

UR - http://www.scopus.com/inward/record.url?scp=84981274717&partnerID=8YFLogxK

U2 - 10.1017/S1743921314005572

DO - 10.1017/S1743921314005572

M3 - Article

SN - 1743-9213

VL - 10

SP - 237

EP - 238

JO - Proceedings of the International Astronomical Union

JF - Proceedings of the International Astronomical Union

IS - H16

ER -

Precision Chemical Abundance Measurements

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