The NextGen Model Atmosphere grid for $3000\le \Teff \le 10000\K$

TL;DR

This paper introduces the NextGen Model Atmosphere grid for low mass stars with effective temperatures from 3000K to 10000K, providing a consistent LTE model set for stellar analysis and evolution.

Contribution

The paper presents a new LTE model atmosphere grid for low mass stars covering a wide temperature, gravity, and metallicity range, compatible with previous models and useful for detailed spectral analysis.

Findings

Models cover 3000K to 10000K in steps of 200K.

Grid spans 3.5 to 5.5 in logg and -4.0 to 0.0 in metallicity.

Comparison with Kurucz 1994 grid and standard stars.

Abstract

We present our NextGen Model Atmosphere grid for low mass stars for effective temperatures larger than $3000\K$. These LTE models are calculated with the same basic model assumptions and input physics as the VLMS part of the NextGen grid so that the complete grid can be used, e.g., for consistent stellar evolution calculations and for internally consistent analysis of cool star spectra. This grid is also the starting point for a large grid of detailed NLTE model atmospheres for dwarfs and giants (Hauschildt et al, in preparation). The models were calculated from $3000\K$ to $10000\K$ (in steps of $200\K$) for $3.5 \le \logg \le 5.5$ (in steps of 0.5) and metallicities of $-4.0 \le \mh \le 0.0$. We discuss the results of the model calculations and compare our results to the Kurucz 1994 grid. Some comparisons to standard stars like Vega and the Sun are presented and compared with detailed NLTE calculations.