Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apjs...76..715t&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 76, June 1991, p. 715-757.
Astronomy and Astrophysics
Astrophysics
61
K Stars, Late Stars, Metallicity, Stellar Composition, Astronomical Catalogs, Error Analysis, Hydrogen, Iron
Scientific paper
'Primary' (Fe/H) averages are presented for 373 evolved K stars of luminosity classes II-IV and (Fe/H) values beween -0.9 and +0.21 dex. The data define a 'consensus' zero point with a precision of + or - 0.018 dex and have rms errors per datum which are typically 0.08-0.16 dex. The primary data base makes recalibration possible for the large (Fe/H) catalogs of Hansen and Kjaergaard (1971) and Brown et al. (1989). A set of (Fe/H) standard stars and a new DDO calibration are given which have rms of 0.07 dex or less for the standard star data. For normal K giants, CN-based values of (Fe/H) turn out to be more precise than many high-dispersion results. Some zero-point errors in the latter are also found and new examples of continuum-placement problems appear. Thus high-dispersion results are not invariably superior to photometric metallicities. A review of high-dispersion and related work on supermetallicity in K III-IV star is also given.
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