Oxygen in Open Cluster Dwarfs: Pleiades and M34

Details Oxygen in Open Cluster Dwarfs: Pleiades and M34 Oxygen in Open Cluster Dwarfs: Pleiades and M34

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...203.1403s&link_type=abstract

American Astronomical Society Meeting 203, #14.03; Bulletin of the American Astronomical Society, Vol. 35, p.1228

Astronomy and Astrophysics

Astronomy

Scientific paper

We analyze the high-excitation 7774 ; Å O 1 triplet in high-resolution, moderate signal-to-noise spectra of 15 Pleiades (HET/HRS) and 8 M34 (Keck/HIRES) open cluster dwarfs. Effective temperatures range from 5048 - 6172 K for the Pleiades sample and from 5290 - 6130 K for the M34 sample. Relative O abundances have been derived using model atmospheres interpolated from four different sets of ATLAS9 grids: with convective overshoot, without convective overshoot, with the mixing length parameter set to 0.5, and with the convective treatment of Canuto, Goldman, & Mazzitelli. In contrast to existing NLTE predictions, a dramatic increase in O 1 triplet abundance with decreasing temperature is seen for both clusters, regardless of atmospheric model. S 1 abundances of three Pleiads derived from the high-excitation λ 6052.67 feature mimic the O 1 abundance behavior. O abundances have also been derived from the 6300 Å [OI] feature in three Pleiads; the abundances exhibit a much lower mean-value than the cool dwarf triplet results. Inasmuch as the [OI] abundances are presumed to be free from NLTE effects, their mean ( {[O/H]}6300 = 0.14) provide the current best estimate of the Pleiades O abundance. Spreads in {[O/H]}Trip at a given temperature are also seen in both clusters; there is no correlation between the spreads and chromospheric activity measures.
This study is supported by a Graduate Student Research Fellowship from the South Carolina Space Grant Consortium and by grants AST 00-86576 and AST 02-39518 awarded to J.R.K. from the National Science Foundation.

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