VOtheorySynthesis < IVOA

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<H1>Mexican VO - SVO - ESAVO Use case: Comparison of evolutionary synthesis models</H1>
<H2>Description</H2>

A user wants to compare the results given by different grids of evolutionary synthesis models (produced by different developers/groups) with observational data. 
 
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<H2>primary actor</H2>

Evolutionary synthesis model user.

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<H2>End result:</H2>

 Plot by VOSpec of results of theoretical and real data.
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<H2>Other actors:</H2>

- Evolutionary synthesis model server

- VO Registry 

- VOSpec
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<H2>Pre-conditions</H2>

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). 
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<H2>Flow of events</H2>

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.
   2 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
   3 The user selects the desired parameters/range of values, and VOSpec send them back to the theoretical service.
   4 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. 
   5 Models and observations are displayed. Using VOSpec both datasets can be normalized to a common scale.
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<H2>Post-condition</H2>
   1 Results provided in VOTable format.
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<H2>Basic assumptions</H2>

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

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<H2>Alternative flows</H2>

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<H2>Open Issues</H2>

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

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Originally sent by *M. Cerviño - 27 Sep 2005* <br>
Last modified: *E. Solano - 30 Sep 2005*
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This area should be used for refinement of the above document. If you want to ask questions or start a dialogue with the author, 
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This topic: IVOA > VOtheorySynthesis
Topic revision: r6 - 2005-09-30 - MiguelCervino