A Grid of Synthetic Spectra for Subdwarfs: Non-LTE Line-blanketed Atmosphere Models
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 1000-10,000 Å 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 ≤ log g [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 halos ([Fe/H] = -1.5 and [α/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.
- Publication:
-
The Astrophysical Journal Supplement Series
- Pub Date:
- October 2021
- DOI:
- 10.3847/1538-4365/ac2508
- arXiv:
- arXiv:2110.02229
- Bibcode:
- 2021ApJS..256...41P
- Keywords:
-
- Stellar atmospheres;
- Spectral energy distribution;
- Stellar spectral lines;
- Subdwarf stars;
- 1584;
- 2129;
- 1630;
- 2054;
- Astrophysics - Solar and Stellar Astrophysics;
- 85A99
- E-Print:
- 10 pages, 10 figures, published at ApJS, 256:41 (10pp), 2021