Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...344..655t&link_type=abstract
Astronomy and Astrophysics, v.344, p.655-667 (1999)
Astronomy and Astrophysics
Astrophysics
10
Stars: Abundances, Stars: Individual: Mu Leo, Galaxy: Open Clusters And Associations: Individual:
Scientific paper
Castro et al. (\cite{c96}) have concluded that mu Leo has three times the solar metallicity. That conclusion is based on their own work and on rezeroed values of [Fe/H] from the literature. A review of their paper reveals that there are significant omissions from their list of literature results. In addition, their procedure for establishing zero points for values of [Fe/H] is found to be fallacious. If that zero-point procedure is nonetheless accepted at face value, and if Hyades data available at the time are used, the zero-point procedure yields metallicities for the Hyades giants that appear to differ from those for Hyades dwarfs. The difference is in the opposite sense to that found by Griffin & Holweger (\cite{gh89}). As a first step in resolving these problems, the zero-point procedure is discussed in some detail. Next, the Hyades problem is reconsidered by taking all published data into account. In agreement with a conclusion drawn by Taylor (\cite{t98b}), no evidence is found for a metallicity difference between Hyades giants and Hyades dwarfs. Published values of [Fe/H] for mu Leo are then analyzed. The technique applied to those data avoids the zero-point problem described above. In addition, it permits the scatter in the mu Leo data to be compared to the scatter in data from about 1000 other stars. In agreement with Taylor (\cite{t96}), it is found that the value of [Fe/H] for mu Leo does not conclusively exceed +0.2 dex. In addition, it is found that the scatter in the mu Leo data is consistent with data scatter for other stars. In contrast, the scatter in the data considered by Castro et al. is found to be unrealistically small. A number of pertinent issues raised by this review are highlighted to encourage future discussion.
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