VAMDC demo
2/24/2012 Vienna
by Nikolai Piskunov and Kevin Benson
VAMDC infrastructure
Node software DB
Node software DB
Database Node
Node software DB
Registry VOSI
. . .
Monitoring . . .
Applications XSAMS
VAMDC Core Infrastructure
Client Applications
Format converters
Format converters
Legacy Applications
Format converters
Applications capable of combining, extracting and processing data from all
VAMDC member databases
VAMDC demo
1. Portal functionality
2. Test queries
3. XSAMS manipulation
4. Use case for stellar astrophysics (Gaia)
5. Automating workflow
2/24/2012 Vienna
Demos 1-3
2/24/2012 Vienna
1.1 Portal functionality
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Status and description of VAMDC databases
1.2 Portal functionality
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Preview of VAMDC databases capable of responding to a query on specific ions
2.1 Collision query
2/24/2012 Vienna Finding data of collisional cross-sections for CO and H
2.2 Spectral line query
2/24/2012 Vienna
Finding radiative transitions of CO in the 4.5-5 μ region
3.1 XSAMS content preview
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Selecting ”consumer” converter (BibTeX) for XSAMS received from HITRAN
3.2 XSAMS content preview
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A fragment of ”consumer” converter presentation of radiative transitions and states as cross-linked tables
Not quite …
2/24/2012 Vienna
• Goal: Deriving stellar parameters from observations
• Data and tools involved:
4.1 Stellar astrophysics
Atomic and molecular
data
Stellar models Opacities
RT solver
EOS
SME
Stellar parameters
Spectral synthesis
2/24/2012 Vienna
• Querying VAMDC
• Converting XSAMS to SME line list format
• Starting SME
• Importing observations
• Importing line list
• Running SME
• Visualizing the results
4.2 What happens
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4.3 Querying VAMDC
Getting a list of atomic transitions in a given spectral region for low excitation atomic energy levels
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4.4 Converting XSAMS to SME input
Using “consumer” converter to create in input for “Spectroscopy Made Easy” (SME) tool
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4.5 Running SME on real observations
SME derives stellar parameters based on VAMDC data
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4.6 Results of SME fit
Resulting SME spectral synthesis compared with the observations
The end
2/24/2012 Vienna
5. Automating workflow
Demo 4 was repeated in automatic mode using Taverna workflow system