A Grid of Synthetic Spectra for Subdwarfs: Non-LTE line-blanketed atmosphere models

TL;DR

This paper introduces a comprehensive grid of synthetic spectra for subdwarf stars, covering a wide parameter space with detailed Non-LTE models, aiding in stellar parameter determination and population synthesis.

Contribution

It provides a new, extensive grid of Non-LTE line-blanketed atmosphere models for subdwarfs, covering broad temperature, gravity, helium, and metallicity ranges.

Findings

High-resolution spectra from 1000Å to 10,000Å are generated.

The grid enables accurate determination of subdwarf parameters.

Database supports population synthesis in various stellar systems.

Abstract

A new grid of detailed atmosphere model spectra for hot and moderately cool subdwarf stars is presented. High-resolution spectra and synthetic photometry are calculated in the range from 1000{\AA} to 10,000{\AA} using Non-LTE fully line-blanketed atmosphere structures. Our grid covers eight temperatures within 10,000<Teff [K]<65,000, three surface gravities in the range 4.5<logg [cgs]<6.5, two helium abundances matching two extreme helium-rich and helium-poor scenarios, and two limiting metallicity boundaries regarding both solar ([Fe/H] = 0) and Galactic halo ([Fe/H] = -1.5 and [{\alpha}/Fe] = +0.4). Besides its application in the determination of fundamental parameters of subdwarfs in isolation and in binaries, the resulting database is also of interest for population synthesis procedures in a wide variety of stellar systems.