TLUSTY and SYNSPEC Users's Guide IV: Upgraded Versions 208 and 54

Understand

We present a brief description of the newly upgraded versions of the programs TLUSTY, version 208, and SYNSPEC, version 54.

• TLUSTY is used to generate model stellar atmospheres or accretion disks, and SYNSPEC produces detailed synthetic spectra and/or opacity tables.
• This paper complements published guides that provide a detailed description of earlier versions of the codes, TLUSTY205, and SYNSPEC51.
• The main upgrades include the flexible construction of opacity tables in SYNSPEC, and their use in producing hybrid models with TLUSTY}, with important species treated in NLTE, while the bulk of opacity of atomic and molecular lines and continua are considered in LTE using a pre-calculated opacity table.