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Astron. Astrophys. Suppl. Ser.
Volume 138, Number 1, July 1999
Page(s) 19 - 30
Published online 15 July 1999
DOI: 10.1051/aas:1999499

Astron. Astrophys. Suppl. Ser. 138, 19-30

Evolutionary synthesis of simple stellar populations

Colours and indices

O.M. Kurth - U. Fritze - v. Alvensleben - K.J. Fricke

Send offprint request: O. Kurth

Universitätssternwarte Göttingen, Geismarlandstr. 11, 37083 Göttingen, Germany

Received March 16, 1998; accepted February 11, 1999


We construct evolutionary synthesis models for simple stellar populations using the evolutionary tracks from the Padova group (1993, 1994), theoretical colour calibrations from [Lejeune et al. (1997, 1998)] and fit functions for stellar atmospheric indices from [Worthey et al. (1994)].

A Monte-Carlo technique allows us to obtain a smooth time evolution of both broad band colours in UBVRIK and a series of stellar absorption features for Single Burst Stellar Populations (SSPs). We present colours and indices for SSPs with ages from $1 \ 10^9$ yrs to $1.6 \ 10^{10}$ yrs and metallicities [M/H]=-2.3, -1.7, -0.7, -0.4, 0.0 and 0.4.

Model colours and indices at an age of about a Hubble time are in good agreement with observed colours and indices of the Galactic and M 31 GCs.

Key words: Galaxy: globular cluster; open clusters galaxies: starclusters; M 31; evolution

SIMBAD Objects

Copyright The European Southern Observatory (ESO)

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