Comments on stellar boundary cooling and the reality of supermetallicity

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Astrophysics, Cooling, Metallic Stars, Stellar Atmospheres, Abundance, Atmospheric Models, Late Stars, Line Spectra

Scientific paper

The paper discusses the 'super-metal-rich' (SMR) stars and reexamines Peterson's analysis of the SMR prototype mu Leo (1978) with regard to a postulated error in continuum error. Model atmospheres are used to compute theoretical equivalent widths and to explore the sensitivity of these widths to metallicity, temperature, surface gravity, and microturbulence. It is shown that Peterson's results are sensitive to continuum placement, and that her data does not indicate that the temperature gradient is steeper in mu Leo than in normal giants. It is concluded that the SMR stars are very metal rich and are also somewhat boundary cooled, possibly due to high metallicity.

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