Atmospheres

Download

All files are available at:

• https://ftp.gwdg.de/pub/misc/phoenix/AtmosFITS/ (HTTPS)
• ftp://ftp.gwdg.de/pub/misc/phoenix/AtmosFITS/ (FTP)

The grid contains the metallicities from [Fe/H]=-2.0 to +1.0 with a step size of 0.5 plus the extra low abundances of -3.0 and -4.0. Alpha element abundances [α/M] from -0.2 to +1.2 (Δ=0.2) are available for -3.0≤[Fe/H]≤0.0.

Each sub-grid is a zip file per [Fe/H] and [α/M], e.g. PHOENIX-ACES-AGSS-COND-2011_AtmosFITS_Z-0.0.Alpha=+0.20.zip.

FITS files

The atmospheres are store in FITS binary tables with the columns:

• Optical depth “tau”.
• Temperature “temp” in units of K.
• Gas pressure “pgas” in units of dyn/cm^2.
• Density “rho” in units of g/cm^3.
• Electron partial pressure “pe” in units of dyn/cm^2.

The header keywords are essentially the same as for the high resolution spectra, as can be found here.