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Published online by Cambridge University Press: 19 July 2016
We present the results of low dispersion spectrophotometry (resolution about 5 å, using IDS at ESO 3.6 m and 1.5 m telescopes) of 80 red supergiants in the Magellanic Clouds: 31 SMC field stars, 26 LMC field stars and 23 suspected members of young populous clusters. From these spectra, spectrophotometric indices have been derived which simulate Strömgren photometry and measure the strengths of the Ca I (4226) line and of the G-band. The indices are calibrated with respect to red giants and provide a set of metallicity indicators.