Pinning Down Gravitational Settling

Details Pinning Down Gravitational Settling Pinning Down Gravitational Settling

2006-08-16

arxiv.org/abs/astro-ph/0608338v1

in: Chemical Abundances and Mixing in Stars in the Milky Way and its Satellites, ed. by S. Randich & L. Pasquini (Springer, He

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures. Summary of a talk given at the ESO-Arcetri workshop in September of 2004. See also astro-ph/0608201

Scientific paper

We analyse high-resolution archival UVES data of turnoff and subgiant stars in the nearby globular cluster NGC 6397 ([Fe/H] = -2). Balmer-profile analyses are performed to derive reddening-free effective temperatures. Due to the limited S/N and uncertainties related to blaze removal, we find the data quality insufficient to exclude the existence of gravitational settling. If the newly derived effective temperatures are taken as a basis for an abundance analysis, the photospheric iron (Fe II) abundance in the turnoff stars is 0.11 dex lower than in the (well-mixed) subgiants.

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