A Phoenix Modelatmosphere Grid For GAIA

TL;DR

This paper introduces a comprehensive grid of stellar atmosphere models and synthetic spectra covering a wide range of stellar parameters, designed to support the analysis of GAIA data.

Contribution

It provides a homogeneous set of model atmospheres and spectra with varied parameters, including metallicity and alpha-element variations, for the first time at this scale.

Findings

Models cover 2700K to 10000K in temperature

Spectra span UV to infrared at 0.2 nm resolution

Models are publicly available for the community

Abstract

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 2700 K <= T_eff <= 10 000 K, gravities (-0.5 <= log(g)<= 5.5) and metalicities (-4.0 <= [Z/H] <= +0.5). In addition, variations of alpha elements are considered for each metalicity. 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/H_p = 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: ftp.hs.uni-hamburg.de/pub/outgoing/phoenix/GAIA