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We present a series of colour evolution models for Luminous Red Galaxies(LRGs) in the 7th spectroscopic data release of the Sloan Digital Sky Survey(SDSS), computed using the full-spectrum fitting code VESPA on highsignal-to-noise stacked spectra. The colour-evolution models are computed as afunction of colour, luminosity and redshift, and we do not a-priori assume thatLRGs constitute a uniform population of galaxies in terms of stellar evolution.By computing star-formation histories from the fossil record, the measuredstellar evolution of the galaxies is decoupled from the survey's selectionfunction, which also evolves with redshift. We present these evolutionarymodels computed using three different sets of Stellar Population Synthesis(SPS) codes. We show that the traditional fiducial model of purely passivestellar evolution of LRGs is broadly correct, but it is not sufficient toexplain the full spectral signature. We also find that higher-order correctionsto this model are dependent on the SPS used, particularly when calculating theamount of recent star formation. The amount of young stars can benon-negligible in some cases, and has important implications for theinterpretation of the number density of LRGs within the selection box as afunction of redshift. Dust extinction, however, is more robust to the SPSmodelling: extinction increases with decreasing luminosity, increasingredshift, and increasing r-i colour. We are making the colour evolution trackspublicly available at http://www.icg.port.ac.uk/~tojeiror/lrg_evolution/.

The stellar evolution of luminous red galaxies, and its dependence on colour, redshift, luminosity and modelling