Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007noao.prop..319d&link_type=abstract
NOAO Proposal ID #2007A-0319
Astronomy and Astrophysics
Astronomy
Scientific paper
The Sun's accurately known parameters have long been used to calibrate stellar models; thus, the Sun provides a fundamental cornerstone for stellar evolution theory. During the past 40 years, standard stellar evolution theory has robustly predicted that the Sun should have depleted its surface Li abundance by a factor of 2-3 during its lifetime. Furthermore, it is predicted that all this depletion should have occurred only during the pre-main sequence. These predictions are consistent with Li in 1-solar-mass stars in the young 100Myr-old Pleiades cluster, but highly inconsistent with the Sun itself, whose Li depletion exceeds a factor of 100. Other open clusters haven shown that Li depletion continues during the main sequence; this requires physics (rotational mixing?) beyond what is included in the standard model. The solar Li depletion well exceeds (by 1.5dex) that in the oldest well-studied open cluster, the Hyades (700Myr-old). Is this due to prolonged main sequence Li depletion, or is it - as some have suggested - that the Sun is an oddball, an abnormal, Li-overdepleter? To address whether or not the Sun is normal we propose to use the unique power of MMT/hectoechelle to compare the solar Li abundance to the Li- Teff trend as defined by a configuration of about 200 dwarfs in the solar-aged, solar-metallicity open cluster M67. There may be implications for several fields in astronomy.
Deliyannis Constantine
Szentgyorgyi Andrew
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