Ultraviolet IUE spectra, optical 12A mm-1 red and blue spectra, optical BV photometry and infrared JHKL photometry of the 7.5-d classical Cepheid R Muscae = HD 110 311 is presented and discussed together with some earlier photometric and radial velocity data. Using the CORS method, a newly derived radius is given, as well as new values for T.tT and log g. The UV spectra confirrned the predicted trend to increasing amplitudes with decreasing wavelength and indicate that R Mus has a shallow chromosphere, while no transition region lines could be detected. From all our data from 1200 A to 5 μm we conclude that R Mus does not have a companion detectable with the sensitivity given, contrary to earlier results.
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