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IVOA Theory: Science Use Cases
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
Case A:
- 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 parameters
space that defines the grid of models.
- The user selects the desired parameters, 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.
Case B (includes Case A, plus):
- The user chooses an observation with VOSpec
- Models and observations are plotted and normalized to a common scale
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
- How to evaluate if the resulting model (final product of a mathematical
algorithm) has a physical meaning? use of cautions, warnings etc...?
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.
-- Miguel Cerviņo - 27 Sep 2005