Issue |
Astron. Astrophys. Suppl. Ser.
Volume 138, Number 1, July 1999
|
|
---|---|---|
Page(s) | 19 - 30 | |
DOI | https://doi.org/10.1051/aas:1999499 | |
Published online | 15 July 1999 |
Evolutionary synthesis of simple stellar populations
Colours and indices
Universitätssternwarte Göttingen, Geismarlandstr. 11, 37083 Göttingen, Germany e-mail: okurth@uni-sw.gwdg.de
Send offprint request to: O. Kurth
Received:
16
March
1998
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