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A temperature calibration for MK‐class III giants from high‐resolution spectral line‐depth ratios
Author(s) -
Strassmeier K.G.,
Schordan P.
Publication year - 2000
Publication title -
astronomische nachrichten
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 63
eISSN - 1521-3994
pISSN - 0004-6337
DOI - 10.1002/1521-3994(200012)321:5/6<277::aid-asna277>3.0.co;2-h
Subject(s) - physics , stars , effective temperature , astrophysics , line (geometry) , calibration , spectral line , table (database) , resolution (logic) , spectral resolution , range (aeronautics) , giant star , astronomy , geometry , mathematics , materials science , computer science , composite material , data mining , quantum mechanics , artificial intelligence
A high‐resolution spectroscopic survey in the 6380–6460 Å region of 224 slowly‐rotating M‐K class III giants is presented. Spectral line‐depth ratios are calibrated against effective temperature obtained from B – V and V – I color indices in the range 3200–7500 K (M6–A9). A table of polynomial coefficients for 12 line‐ratio– T eff relations can be used to derive T eff of F–M stars to within 33 K (rms), and of early‐F and mid‐to‐late M stars to within 77–106 K (rms).