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

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Demos 1-3

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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

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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 …

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• 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

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• 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

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5. Automating workflow

Demo 4 was repeated in automatic mode using Taverna workflow system