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Mexican VO - SVO - ESAVO Use case: Comparison of evolutionary synthesis models


A user wants to compare the results given by different grids of evolutionary synthesis models (produced by different developers/groups) with observational data.

primary actor

Evolutionary synthesis model user.

End result:

Plot by VOSpec of results of theoretical and real data.

Other actors:

- Evolutionary synthesis model server

- VO Registry

- VOSpec


1 Existence of a protocol (e.g. TSAP) that explores (using the "format=metadata" option) the parameter space of the theoretical grid of models (not known a priori).

Flow of events

All the information exchange between the synthesis model server and VOSpec is done using the TSAP protocol.

  1. User logins in VOSpec and makes a query by object
  2. Among the SSA and theoretical services provided by VOSpec the user selects those of interest.
  3. In response to the "format=metadata" query, the selected theoretical services send a VOTable to VOSpec with the parameter space (and the associated valid values) that defines the grid of models.This information is displayed by VOSpec
  4. The user selects the desired parameters/range of values, and VOSpec send them back to the theoretical service.
  5. The service returns a VOTable with the results to be displayed by VOSpec. Depending on the server, the results can be obtained from a pre-computed grid of models or on-the-fly.
  6. Models and observations are displayed. Using VOSpec both datasets can be normalized to a common scale.


  1. Results provided in VOTable format.

Basic assumptions

Synthesis models mix the results of two types of theoretical results: evolutionary tracks and atmosphere models.

Alternative flows

Open Issues

  1. How to evaluate if the resulting model (final product of a mathematical algorithm) has a physical meaning? Use of cautions, warnings etc...?

Originally sent by M. Cerviņo - 27 Sep 2005
Last modified: E. Solano - 30 Sep 2005
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Topic revision: r6 - 2005-09-30 - MiguelCervino
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