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Astron. Astrophys. 358, 587-592 (2000)

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Precise temperatures of classical Cepheids and yellow supergiants from line-depth ratios

V.V. Kovtyukh and N.I. Gorlova

Astronomical Observatory, Odessa State University, Shevchenko Park, 65014, Odessa, Ukraine

Received 12 November 1999 / Accepted 21 January 2000


The ratios of spectral line-depths are powerful indicators of the effective temperature. Thirty-two functional formulas to estimate the effective temperatures from line-depth ratios for Cepheids and F-G supergiants are offered. For high-quality spectra we find errors in the temperature as small as 10-15 K. These calibrations are only little sensitive to other stellar parameters and allow to derive highly precise [FORMULA] for supergiants in the range 4700-6700 K.

Key words: line: formation – stars: fundamental parameters – stars: variables: Cepheids

© European Southern Observatory (ESO) 2000

Online publication: June 8, 2000