A PHOENIX Model Atmosphere Grid for Gaia

We present the results of a set of model atmospheres and synthetic spectra computed with the PHOENIX code. The models cover a range of effective temperatures (2 700 K ≤ Teff ≤ 10 000 K), gravities (-0.5 ≤ log(g) ≤ 5.5) and metallicities (-4.0 ≤ [Z/H] ≤ +0.5). In addition, variations of alpha elements are considered for each metallicity. The models are computed with a homogeneous set of input data in order to allow for direct relative comparison between the models. For example, all models use a mixing length of l/Hp = 2.0. We provide synthetic spectra with a resolution of 0.2 nm from the UV to the infrared for all models. We give a brief overview of the input physics and show illustrative results. All synthetic spectra are available via ftp.