The allowed age range depends slightly on the selected grid and metallicity but is around 12.3 Myr and 20 Gyr. If the age is out of the limits, a message will show the age limits for the grid and metallicity selection. To download single isochrone, select the grid, metallicity and just type the required age in Myr. In case of multiple isochrones request, type Age1--Age2, step all in Myr. For example, typing 1000--2000, 100 will produce as output 11 isochrones with ages equal to 1000, 1100, ..., 2000 Myr. For reasons of computational time, the maximum number of isochrones downloadable in one go is 150. Note that for a BC with a large number of filters, computation time could be up to 20 minutes. If a photometric system is not selected, the HR-diagram is provided by default. For pre-computed isochrones, please select grid, metallicity and photometric system. Then, click on "Pre-computed isochrones" link below Phot. System section. If a metallicity is not selected, all metallicities for the selected photometric system will be downloaded.

The sampling for the pre-computed isochrones is:

The photometric systems for wich we computed bolometric corrections. Given are also the source form the response curves and reference zero-points.

Photometric systemCalibrationPassbandsZero-points
2MASS Vegamag Cohen et al. (2003)Cohen et al. (2003)
CFHT (MegaCam) ABmag CFHT Documentationa 0
Euclid (VIS + NISP) ABmag Euclid mission databaseb 0
Gaia DR1 Vegamag Jordi et al. (2010)c Jordi et al. (2010)
Gaia DR2 Vegamag Maíz Apellániz & Weiler (2018)d Maíz Apellániz & Weiler (2018)
Gaia DR3 Vegamag Riello et al. (2021) Riello et al. (2021)
GALEX ABmag NASAe 0
Hipparcos + Thyco ABmag Bessell & Murphy (2012) Bessell & Murphy (2012)
HST (WFPC2) Vegamag SYNPHOT SYNPHOT
HST (WFC3) Vegamag SYNPHOT SYNPHOT
HST (ACS) Vegamag SYNPHOT SYNPHOT
Johnson, Bessel & Brett Vegamag Bessell & Brett (1988); Bessell (1990) Bessell et al. (1998)
J-PLUS ABmag J-PLUS collaborationf 0
JWST (NIRCam - Post Launch) Vegamag JWST User Documentationg SYNPHOT
JWST (NIRCam - Sirius)g1Vegamag JWST User Documentationg SYNPHOT
JWST (NIRISS - Post Launch) Vegamag JWST User Documentationg SYNPHOT
Kepler ABmag Kepler collaborationh 0
Nancy Grace Roman Telescope (WFI) Vegamag Roman Documentation i SYNPHOT
PanSTARSS1 ABmag Tonry et al. (2012) 0
SAGE ABmag SAGE collaboration 0
SDSS ABmag Doi et al. (2010) Dotter et al. (2008)
Skymapper ABmag Bessell (2011) 0
Spitzer (IRAC) Vegamag NASAj Groenewegen (2006)
Strömgren Vegamag Maíz Apellániz (2006) Maíz Apellániz (2006)
Subaru (HSC) ABmag HSC collaborationk 0
SWIFT (UVOT) Vegamag HEASARCl Poole et al. (2008)
TESS ABmag TESS collaborationm 0
UVIT (FUV + NUV + VIS) ABmag UVIT collaborationn Tandon et al. (2017)
Vera C. Rubin Observatory ABmag LSST collaborationo 0
Victor M. Blanco Telescope (DECam)ABmag CTIOp 0
VISTA (VIRCAM) Vegamag ESOq Rubele et al. (2012)
WISE Vegamag WISE collaborationr Wright et al. (2010)
  • [a] www.cfht.hawaii.edu
  • [b] euclid.esac.esa.int
  • [c] The nominal G passband curve has been corrected following the post-DR1 correction provided by Maiz-Apellaniz (2017)
  • [d] Two different GBP passbands are provided for sources brighter and fainter than G=10.87, respectively.
  • [e]Galex
  • [f] www.j-plus.es
  • [g] jwst-docs.stsci.edu
  • [g1] This photometric system adopts the "post launch passbands but Vega zeropoints obtained by using Sirius as the color reference (see JWST User Documentation for more details).
  • [h]nexsci.caltech.edu
  • [i]nexsci.caltech.eduroman.gsfc.nasa.gov
  • [j]nexsci.caltech.eduirsa.ipac.caltech.edu
  • [k] hsc-release.mtk.nao.ac.jp
  • [l]heasarc.gsfc.nasa.gov
  • [m]heasarc.gsfc.nasa.gov
  • [n]uvit.iiap.res.in
  • [o]github.com/lsst
  • [p]www.ctio.noirlab.edu
  • [q]www.eso.org
  • [r]wise2.ipac.caltech.edu