Department of Astronomy Department of Astronomy

Research

Geneva grids of stellar evolution models

An extensive and homogenous database of stellar evolution models for masses between 0.8 and 120 solar masses and metallicities from Z=0.001 to 0.1 is available. In general the models include evolutionary phases from the main sequence up to either the end of carbon burning for massive stars, the early asymptotic giant branch phase for intermediate-mass stars, or core helium flash for low-mass stars. Pre-main sequence tracks, both canonical (i.e. evolved at constant mass) and accretion scenarios are also provided, as well as horizontal banches for low-mass stars. Predictions regarding the spectral evolution of massive stars can further be obtained from the so-called "combined stellar structure and atmosphere models" (CoStar).

Finally, references are also given to the serie of papers on stellar models with rotation and on stellar models with rotation and magnetic field.

Grids of Geneva’s Stellar Evolution Models

The available grids are summarized in the table below. The data can be extracted under the column Grid, which points to the CDS data center in Strasbourg. The publications related to each grid can be found under the column Paper. They do NOT include the data tables, except for Schaller et al. 1992.

GridZXYMass lossPaperNotes
PMS 0.001, 0.02 Pre-Main Sequence Bernasconi & Maeder 1996,
Bernasconi 1996		 Canonical and accretion scenarios available
I 0.001 0.756 0.243 standard Schaller et al. 1992  
I 0.020 0.680 0.300 standard Schaller et al. 1992  
II 0.008 0.728 0.264 standard Schaerer et al. 1993  
III 0.004 0.744 0.252 standard Charbonnel et al. 1993  
IV 0.040 0.620 0.340 standard Schaerer et al. 1993  
V 0.001->0.04 . . 2 × standard Meynet et al. 1994 M >= 12 Msun
VI 0.001, 0.02 Horizontal Branch Charbonnel et al. 1996 0.8 <= M/Msun <= 1.7
VII 0.100 0.420 0.480 standard Mowlavi et al. 1998  
VIII 0.001, 0.02 Low-mass stars Charbonnel et al. 1998 0.4 <= M/Msun <= 1.0
CoStar Combined interior + atmosphere (massive stars) Schaerer et al. 1996a,
Schaerer et al. 1996b,
Schaerer 1996		 spectra predictions

Models with rotation

Models with rotation are described in the following new serie of papers:

  Initial chem. compos. Paper Title
Notes
I   Meynet & Maeder 1997 The computational method and the inhibiting effect of the mu-gradient
II   Maeder 1997 A new approach for shear mixing
III   Maeder & Zahn 1998 Meridional circulation with mu-gradients and non-stationarity
IV   Maeder 1999 Von Zeipel’s theorem and anisotropic losses of mass and angular momentum
V solar Meynet & Maeder 2000 Changes in all the Outputs of Massive Star Models
grids of 9 to 120 solar masses models
VI solar Maeder & Meynet 2000 The Eddington and Omega -limits, the rotational mass loss for OB and LBV stars
VII Z=0.004 Maeder & Meynet 2001 Low metallicity models and the blue to red supergiant ratio in the SMC
grids of 9 to 60 solar masses models
VIII Z=0.00001 Meynet & Maeder 2002 Models at Z = 10-5 and CNO yields for early galactic evolution
grids of 2 to 60 solar masses models
IX   Maeder 2002 The effects of the production of asymmetric nebulae on the internal evolution
X solar Meynet & Maeder 2003 Wolf-Rayet star populations at solar metallicity
XI Z=0.004, 0.008, 0.040 Meynet & Maeder 2005 Wolf-Rayet star populations at different metallicities
XII solar Hirschi, Meynet & Maeder 2004 Pre-supernova models
XIII Z=0.004, 0.008, 0.020, 0.040 Hirschi, Meynet & Maeder 2005 Predicted GRB rates

Models with rotation and magnetic fields

Models with rotation and magnetic fields are described in the following new serie of papers:

  Paper Title
Notes
I Maeder & Meynet 2003 The relative importance of rotational and magnetic effects
II Maeder & Meynet 2004 General equations for the transport by Tayler-Spruit dynamo
III Maeder & Meynet 2005 The interplay of circulation and dynamo
IV Eggenberger, Maeder & Meynet 2005 The solar rotation profile