Info on spectra

FITS files

Please not that the units for mass and luminosity are wrong in the FITS headers, see the correction below!

The FITS files available for download contain the following FITS keywords:

Keyword Description
PHXTEFF [K] effective temperature
PHXLOGG [cm/s2 ] log (surface gravity)
PHXM H [M/H] metallicity (rel. sol. – Asplund et al 2009)
PHXALPHA [a/M] alpha element enhancement
PHXDUST [T/F] Dust in atmosphere, always F for this grid
PHXXI L [km/s] micro-turbulent velocity for LTE lines
PHXXI M [km/s] micro-turbulent velocity for molec lines
PHXXI N [km/s] micro-turbulent velocity for NLTE lines
PHXMASS [g] Stellar mass
PHXREFF [cm] Effective stellar radius
PHXLUM [erg/s] Stellar luminosity
PHXMXLEN Mixing length
PHXBUILD Build date of Phoenix
PHXVER Phoenix version
DATE [local] finishing date of model calculation
PHXEOS Equation of state

The medium-resolution spectra define their wavelength grid by a set of four FITS keywords:

Keyword Description
CRVAL1 Wavelength of reference pixel
CDELT1 Wavelength grid step size
CRPIX1 Reference pixel coordinates
CTYPE1 Type of wavelength grid


The type of the wavelength grid is WAVE/AWAV for vaccum/air wavelengths and WAVE-LOG/AWAV-LOG if the wavelengths are given in logarithmic values.

Model with disabled convection have an additional keyword PHXCONV with the value F. Furthermore for those spectra that are the result of an interpolation, we added the keyword INTERPOL with the value T.

For the high-resolution spectra there is also a second FITS extension in the file containing a binary table listing all the element abundances that have been used in the model.