Dartmouth Stellar Evolution Database

What is this?

This page allows one to interpolate isochrones for any [Fe/H] within the bounds of the computed grid (via a web interface to iso_interp_feh) and generate luminosity functions (LFs) from those isochrones (via a web interface to isolf). For more on these programs see the Programs page. Currently available only for the 1 - 15 Gyr isochrones.

Interpolation Options

Interpolation:		Cubic gives smoother, more accurate results but may cause undesirable kinks in isolated cases. In this case, try Linear or refer to the Model Grid.

Output Options

Output:		Choose the desired type of output.

Age Options

Enter a list of ages in Gyr separated by spaces, e.g. "10.1 10.2 10.3 10.4".
Available range is 1 - 15 Gyr. Leave empty for the default set of ages.
Maximum of 50 ages.

Age=

Isochrone Options

[Fe/H]=		Available range is -2.5 < [Fe/H] < +0.5
Helium:		Options for the Helium mass fraction. Y=0.33 and 0.40 only available for [Fe/H] <= 0.
[α/Fe]=		Options for [α/Fe]. Only [α/Fe]=0 or +0.4 for Y=0.33 and 0.40.
Colors:		Choice of photometric system. Filters listed in table below.

Luminosity Function Options

Filter:		Filter in which to build LFs. See table below for options.
Bin Size=		Bin size in mag.
IMF Type:		Type of initial mass function (IMF).
PL: Slope=		Power Law IMF: dN/dM ∝ M^X. For Salpeter x=-2.35.
LN: Mc=		Log Normal IMF: dN/dM ∝ exp(-ln(M/Mc)/2σ²).
LN: σ=		Mc is central mass in Solar units; σ is dispersion.