International Virtual Observatory Alliance

Difference: VOtheorySynthesis (4 vs. 5)

Revision 52005-09-30 - EnriqueSolano

 					Back to IVOA Theory: Science Use Cases 


 SVO - ESAVO Use case: Comparison of evolutionary synthesis models 
 Description 

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
->
>
+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

 Pre-conditions 

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.
-<
<
+ User logins in VOSpec and selects the corresponding service.
  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.
->
>
+ User logins in VOSpec and makes a query by object
  Among the SSA and theoretical services provided by VOSpec the user selects those of interest.
  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
->
>
+ The user selects the desired parameters/range of values, and VOSpec send them back to the theoretical 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.
-<
<
+ The user chooses an spectroscopic observation with VOSpec.
->
>
+ Models and observations are displayed. Using VOSpec both datasets can be normalized to a common scale.
-<
<
+ Models and observations are plotted and normalized to a common scale.
  Post-condition
-<
<
+ Results provided in VOTable format
->
>
+ 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 
 

 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. Cerviño - 27 Sep 2005
-<
<
+Last modified: E. Solano - 29 Sep 2005
->
>
+Last modified: E. Solano - 30 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.







<-- 
 
 
 Set ALLOWTOPICRENAME = TWikiAdminGroup
 
 
-->

View topic | History: r10 < r9 < r8 < r7 | More topic actions...