Main differences between both kind of spectra are the following: - Models have specific input parameters - Theoretical Spectra are not normalized
18-19/06/2007
H. Wozniak
2
Observer point-of-view •
Looking for spectra of HDxxxxxx or region in the sky: http://www.myvo.org/ssa?REQUEST=queryData&POS=22.438,-17.2&SIZE=0.02
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Only one object: the star has a spectral type of characteristics equivalent to a range in: – Teff – Log g – Fe/H, α/Fe, etc…
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If several objects: a collection of ‘ranges’ in parameter space.
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Retrieve the theoretical spectra in the same range of Teff, Log g, Fe/H etc. – ‘automatically’ – upon request – after Teff, Log g, Fe/H, α/Fe determination
18-19/06/2007
H. Wozniak
3
Need to simply improve SSA ? 4.1.2 Recommended and Optional Query Parameters The following additional parameters should or may be implemented by a service; all the recommended parameters are required for a fully compliant service.
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• • • •
POS, SIZE, TIME, BAND, [FORMAT=]: These parameters SHOULD be implemented by the service. A valid request is any combination of these parameters. What’s happening if all are missing? POS=?, unclear SIZE=? Should be defaulted to some internal value TIME=, BAND=, unclear FORMAT=ALL by default
18-19/06/2007
H. Wozniak
4
Issues for theory spectra • • • • •
How to deal with irrelevant parameters (unclear written in doc) -> how to express irrelevance of mandatory parameters in format=metadata How to deal with theory parameters (ala TSAP?) (probably description in doc). Format=metadata What UCD to assign (all there?) Is Spectrum DM compatible? Sufficient?
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