Spectra

Download

High resolution spectra

All files are available at:

The parameter range of the grid is

Parameter	Range	Step size
T_eff [K]	2300 - 7000	100
	7000 - 12000	200
log(g)	0.0 - 6.0	0.5
[Fe/H]	-4.0 - -2.0	1.0
	-2.0 - +1.0	0.5
[α/M]	-0.2 - +1.2	0.2

Alpha element abundances [α/M]≠0 are available for -3.0≤[Fe/H]≤0.0 only.

Each spectrum is a single file in the directory of its metallicity, e.g. PHOENIX-ACES-AGSS-COND-2011/Z-0.5/lte05800-4.50-0.5.PHOENIX-ACES-AGSS-COND-2011-HiRes.fits for T_eff=5800 K, log(g)=4.5, [Fe/H]=-0.5. For [α/M]≠0 the alpha value is appended to both the directory and the file name, e.g. Z-0.0.Alpha=+0.20/lte05800-4.50-0.0.Alpha=+0.20.PHOENIX-ACES-AGSS-COND-2011-HiRes.fits. The wavelength grid is the same for all spectra and stored in WAVE_PHOENIX-ACES-AGSS-COND-2011.fits in the top directory.

Medium resolution spectra

All files are available at:

Medium resolution spectra are provided in two different resolutions and wavelength ranges:

Resolution	Range	Directory
Δλ=1Å	3000-10000Å	`A1FITS`
R=10000	3000-25000Å	`R10000FITS`

For both the sampling rate is twice as high as the resolution. In case you are interested in a medium resolution grid with another resolution and wavelength range that might be of interest for the public, let us know and we will make it available for download.

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 directory contains one zip file per [Fe/H] and [α/M], e.g. A1FITS/PHOENIX-ACES-AGSS-COND-2011_A1FITS_Z-0.0.zip or R10000FITS/PHOENIX-ACES-AGSS-COND-2011_R10000FITS_Z-0.0.Alpha=+0.20.zip.

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.