Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-08-04
Mon.Not.Roy.Astron.Soc.Lett.363:L81-L85,2005
Astronomy and Astrophysics
Astrophysics
Accepted for publication in MNRAS letters, 5 pages
Scientific paper
10.1111/j.1745-3933.2005.00090.x
The early F dwarf star ``J37'' in the open cluster NGC6633 shows an unusual pattern of photospheric abundances, including an order of magnitude enhancement of lithium and iron-peak elements, but an under-abundance of carbon. As a consequence of its thin convection zone these anomalies have been attributed to either radiative diffusion or the accretion of hydrogen-depleted material. By comparing high resolution VLT/UVES spectra of J37 (and other F stars in NGC 6633) with syntheses of the Be ii doublet region at 3131 Ang, we establish that J37 also has a Be abundance (A(Be)=3.0+/-0.5) that is at least ten times the cosmic value. This contradicts radiative diffusion models that produce a Li over-abundance, as they also predict photospheric Be depletion. Instead, since Be is a highly refractory element, it supports the notion that J37 is the first clear example of a star that has accreted volatile-depleted material with a composition similar to chondritic meteorites, although some diffusion may be necessary to explain the low C and O abundances.
Ashwell Johanna F.
Deliyannis Constantine P.
Jeffries Robin D.
King Jeremy R.
Smalley Barry
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