International Virtual Observatory Alliance

Difference: VOtheorySynthesis (2 vs. 3)

Revision 32005-09-28 - EnriqueSolano

 					Back to IVOA Theory: Science Use Cases
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+ Use case: Comparison/use of evolutionary synthesis models
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+UNDER CONSTRUCTION


 Use cases: Comparison/use of evolutionary synthesis models
  Description 

Case A: A user with deep knowledge of evolutionary synthesis models wants to compare the 
results given by different grids of models (produced by different developers/groups) for the same set of input parameters.

Case B: A user wants to retrieve an specific evolutionary synthesis model to perform a simple comparison (overplot) with real data. 

 primary actor 
Case A: Evolutionary synthesis model expert user

Case B: Evolutionary synthesis model standard user

 End result: 

Case A: Plot by VOSpec of results obtained from different grids of models with the same 
input parameters (age and metallicity).

Case B: Plot by VOSpec of results of theoretical and real data.


 Other actors: 

Case A: Evolutionary synthesis model server

Case B: Evolutionary synthesis model server, observational data server

- VOSpec

 Pre-conditions 

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

 Flow of events
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+All the information exchange between the synthesis model server and VOSpec is done using the TSAP protocol.
 Case A:
 

 User logins in VOSpec and selects the corresponding service.
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+ In response to the "format=metadata" query, the service sends a VOTable to VOSpec with the parameters 
 
space that defines the grid of models. 
 The user selects the desired parameters, and VOSpec send them back to the
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+ In response to the "format=metadata" query, the service sends a VOTable to VOSpec with the parameter space (and the associated valid values) that defines the grid of models.
  The user selects the desired parameters/values, and VOSpec send them back to the service.
  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.
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+service. 
 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.
 Case B (includes Case A, plus):
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+ The user chooses an observation with VOSpec
  Models and observations are plotted and normalized to a common scale
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+ The user chooses an spectroscopic observation with VOSpec.
  Models and observations are plotted and normalized to a common scale.
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+All the information exchange between the synthesis model server and VOSpec is done using the
TSAP protocol.
  Post-condition 
 
 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
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+ How to evaluate if the resulting model (final product of a mathematical
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+ 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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+algorithm) has a physical meaning? use of cautions, warnings etc...?
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+Originally sent by M. Cerviño - 27 Sep 2005 

Last modified: E. Solano - 28 Sep 2005
 Please add comments below.
This area should be used for refinement of the above document. If you want to ask questions or start a dialogue with the author, 
please  use the theory mailing list.
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+-- Miguel Cerviño - 27 Sep 2005
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