An updated MILES stellar library and stellar population models
Instituto de Astrofísica de Canarias, vía Láctea s/n, La Laguna, Tenerife, Spain
2 Departamento de Astrofísica, Universidad de La Laguna, 38205 La Laguna, Tenerife, Spain
3 Departamento de Física Teórica, Universidad Autonoma de Madrid, 28049 Madrid, Spain
4 Dept. de Astrofísica, Fac. de Ciencias Físicas, Universidad Complutense de Madrid, 28040 Madrid, Spain
5 Centro de Estudios de Física del Cosmos de Aragón, Plaza de San Juan 1, Planta 2 a, 44001 Teruel, Spain
6 Kapteyn Astronomical Institute, University of Groningen, Postbus 800, 9700 AV Groningen, The Netherlands
Received: 7 March 2011
Accepted: 29 June 2011
Aims. We present a number of improvements to the MILES library and stellar population models. We correct some small errors in the radial velocities of the stars, measure the spectral resolution of the library and models more accurately, and give a better absolute flux calibration of the models.
Methods. We use cross-correlation techniques to correct the radial velocities of the offset stars and the penalised pixel-fitting method, together with different sets of stellar templates, to re-assess the spectral resolution of the MILES stellar library and models. We have also re-calibrated the zero-point flux level of the models using a new calibration scheme.
Results. The end result is an even more homogeneously calibrated stellar library than the originally released one, with a measured spectral resolution of ~2.5 Å, almost constant with wavelength, for both the MILES stellar library and models. Furthermore, the new absolute flux calibration for the spectra excellently agrees with predictions based on independent photometric libraries.
Conclusions. This improved version of the MILES library and models (version 9.1) is available at the project’s website (http://miles.iac.es).
Key words: catalogs / methods: data analysis / techniques: spectroscopic / stars: kinematics and dynamics / galaxies: kinematics and dynamics
© ESO, 2011