CMD 2.8 input form

A web interface dealing with stellar isochrones and their derivatives

NEW! (16mar16) PARSEC+COLIBRI isochrones including the TP-AGB phase available, as in Rosenfield et al. (2016).
(26jan16) VST/OMEGAM filters revised and set to ABmags.


Help FAQ History


Evolutionary tracks

TP-AGB tracks from COLIBRI are now available.

Note: PARSEC isochrones (Bressan et al. (2012)) are computed for a scaled-solar composition and following the Y=0.2485+1.78Z relation. The solar metal content is Z☉=0.0152. They include the pre-main sequence phase. Tables of evolutionary tracks are also available.
same option as below, with the addition of TP-AGB tracks from COLIBRI (Marigo et al. (2013)), version PR16 (Rosenfield et al. (2016)). Note: alpha release. New interpolation scheme coming soon, please report interpolation errors to Phil Rosenfield.
available for 0.0001≤Z≤0.06 (-2.2≤[M/H]≤+0.5); for 0.0001≤Z≤0.02 the mass range is 0.1≤M/M☉<350; for 0.03≤Z≤0.04 0.1≤M/M☉<150, and for Z=0.06 0.1≤M/M☉<20 (cf. Tang et al. (2014) for 0.001≤Z≤0.004, and Chen et al. (2015) for other Z). With revised and calibrated surface boundary conditions in low-mass dwarfs (Chen et al. (2014)), and a slightly improved resolution.
available for 0.0001≤Z≤0.06 (-2.2≤[M/H]≤+0.5), in the range 0.1≤M/M☉<12. With revised diffusion+overshooting in low-mass stars, and improvements in interpolation scheme.
available for 0.0005≤Z≤0.07 (-1.5≤[M/H]≤+0.6), in the range 0.1≤M/M☉<12.

Mass-loss on RGB using the Reimers formula with ηReimers=

Warning: mass loss works fine as long as ηReimers<0.5. Check the results for higher values.


Previous sets: The following isochrones are available for all 0.0001≤Z≤0.03, and ages from 0 to 17 Gyr, in the range 0.15≤M/M☉<100.


Girardi et al. (2000) up to early-AGB + detailed TP-AGB from Marigo & Girardi (2007) (for M≤7M☉) + Bertelli et al. (1994) (for M>7M☉) + additional Z=0.0001 and Z=0.001 tracks.
Girardi et al. (2000) + simplified TP-AGB (for M≤7M☉) + Bertelli et al. (1994) (for M>7M☉) + additional Z=0.0001 and Z=0.001 tracks.
Photometric system

Sets of bolometric corrections to be applied to "normal stars":
or on
(see also Marigo et al. (2008) and Girardi et al. (2002))

Choose among the available photometric systems:
They are briefly described here.

For Carbon stars, you can choose bolometric corrections based either on
(as in Marigo et al. (2008) and Girardi et al. (2008)) or on

Circumstellar dustThis will only affect stars with significant mass loss, especially the red supergiants, TP-AGB, and upper-RGBs, and only in the case of Marigo et al. (2008) and later tracks. The following choices refer to the RT calculations, which are applied using the scaling relations described in the paper.
Available dust compositions:
for M stars for C stars
As in Bressan et al. (1998):
As in Groenewegen (2006):
Interstellar extinctionIf AV>0, extinction coefficients will be applied on a star-to-star basis. See Girardi et al. (2008) for details.

Warning: For the moment, interstellar extinction works only for isochrone tables, not for LFs or SSP integrated magnitudes.

Extinction curve: Cardelli et al. (1989) + O'Donnell (1994) with RV=3.1.
Total extinction AV = mag.
Initial mass functionThe IMF will be used to compute the stellar occupation along the isochrones, when computing integrated magnitudes, LFs, etc.
IMF for single stars:

Ages/metallicitiesChoose your age and metallicity values using the approximation [M/H]=log(Z/Z☉), with Z☉=0.019 for Marigo et al. (2008) and previous tracks,
and Z☉=0.0152 for PARSEC Bressan et al. (2012) and later tracks,

of t = yr, and Z =
Z = ,
from log(t/yr) = to at steps of Δ(logt) =
t = ,
from Z = to at steps of ΔZ =

OutputKind of output:

in the interval from to with bins mag wide

(Files above 50 Mby will always be gzipped!)


This service is mantained by Léo Girardi at the Osservatorio Astronomico di Padova.
Questions, comments and special requests should be directed to leo.girardi@oapd·inaf·it .
Last modified: Fri Mar 18 08:53:11 2016