Astron. Astrophys. Suppl. Ser.
Volume 138, Number 1, July 1999
|Page(s)||19 - 30|
|Published online||15 July 1999|
Evolutionary synthesis of simple stellar populations
Colours and indices
Universitätssternwarte Göttingen, Geismarlandstr. 11, 37083 Göttingen, Germany e-mail: email@example.com
Send offprint request to: O. Kurth
Accepted: 11 February 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 yrs to yrs and metallicities , -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
© European Southern Observatory (ESO), 1999