Stellar Atmospheres

Lectures on the Analysis of Stellar Spectra given in Kunming and Beijing 2019

Lecture Slides

Lecture 1: The Model Atmosphere
Lecture 2: The Line Profile
Lecture 3: Spectral Analysis -- Step-by-Step

This is an evolving course and the materials are beingh updated frequently. Substantial improvements are readily apparent each time the course is given.

Recommended Reading

The Observation and Analysis of Stellar Photospheres: D. F. Gray
Theory of Stellar Atmnospheres: D. Mihalas and I. Hubeny 2014, Princeton.
Stellar Spectral Classification : R. O. Gray 2009

Resources

Note: lte_codes is a development package and is always used at risk without warranty from the authors.
Users are welcome and encouraged to suggest and provide improved or corrected code.

Draft User Guide: the User Guide is a work in progress.
It contains an installation walkthrough, a description of the physics in the codes and what they do, and details of how to run them.
Online command references and examples are provided at the Stellar Atmospheres Software Store

The following tarballs should provide sufficient material to install the code and run some examples.

lte_codes 3.4.0: 2019 November
** lte_codes 3.4.6: 2021 July **
The primary source code and scripts for sterne, spectrum, sfit and ffit.
lte_codes requires a suitable fortran compiler and the automake toolkit for installation under linux or macOS.

osdata: Atomic data, opacities, and a restricted grid of model atmospheres for use with lte_codes. This should ideally be installed in ~/share/osdata
2020.11.5: Updated to install photo-ionization cross-sections required by Version 3.4.5

DEMO pack: Files containing material used in the demonstrations in Kunming (see Lecture 4).

Associated codes

lte_lines: assessed atomic data for optical analyses of B stars -- outdated
idlines (IDL): documentation outdated -- check header for idl.pro
isfit : JAVA-based spectral analysis interface: not included
autodoc : script for self-documenting subroutine libraries: not included

References

The history and devleopment of lte_codes is well documented in the Draft User Guide. The package and its components have been described and used in many publications, the more recent of which include:

Cyclic and secular variation in the temperatures and radii of extreme helium stars, Jeffery et al. 2001: MNRAS 321, 111
Time-resolved spectral analysis of the pulsating helium star V652 Her, Jeffery, Woolf & Pollacco 2001, A&A 376, 497
LTE model atmospheres with new opacities. I. Methods and general properties, Behara & Jeffery 2006, A&A 451, 643
An extremely peculiar hot subdwarf with a 10 000-fold excess of zirconium, yttrium and strontium, Naslim et al. 2011, MNRAS 412, 363
Discovery of a variable lead-rich hot subdwarf: UVO 0825+15, Jeffery et al. 2017, MNRAS 465, 3101
Surface abundance and the hunt for stratification in chemically peculiar hot subdwarfs: PG 0909+276 and UVO 0512-08, Wild & Jeffery 2018, MNRAS 473, 4021

This page is maintained by:
Simon Jeffery (Simon.Jeffery@armagh.ac.uk)
Last modified: 30/10/19