T0 : extensions to em, obs, spect, instr

[Frederic V. "Rick" Hessman]

1. I suggest we rename em from "electromagnetic spectrum" to "emission"  
and add

		em.grav-wave			(gravitational wave)
		em.neutrino			(neutrino)

	Alternatively, add

		phys.grav-wave			(gravitational wave)
		phys.particle				(particle emission)
		phys.particle.cosmic-ray
		phys.particle.neutrino
		...?

2. I suggest we add UCD's for describing calibration observations.   
Presently, they are
	few mentions of calibrations at all in the official list:

		instr.calib				(calibration parameter)
		phot.calib				(photometric calibration)

	and they are sorely needed for things like VOEvent and RTML.

	It's trivial to say that there's a big different between calibrations  
(see above) and calibration
	observations, so new UCD's are needed and it seems the likely  
candidates would be:

		obs.calib				(calibration observation)
		obs.calib.dome-flat		(dome-flat observation)
		obs.calib.flux			(flux calibration observation)
		obs.calib.freq			(frequency calibration observation)
		obs.calib.guide-star		(guide-star observation, e.g. for intial setup)
		obs.calib.phot			(photometric calibration observation)
		obs.calib.pos			(astrometric calibration observation
		obs.calib.sky-flat		(sky-flat observation)
		obs.calib.slit-mask		(slit-mask calibration observation)
		obs.calib.spect			(spectral type calibration observation)
		obs.calib.veloc			(radial velocity calibration observation, e.g.  
standard star)
		obs.calib.wl			(wavelength calibration observation)

	For completeness, one should then also add

		phot.calib.flux			(photometric flux calibration)
		phot.calib.mag			(photometric magnitude calibration)
		pos.calib				(astrometric calibration)
		spect.calib			(spectroscopic calibration)
		spect.calib.wl			(" " in wavelength)
		spect.calib.freq			(" " in frequency)

3. Suggested addition to spect (Spectroscopy)

		spect.cont				(spectral continuum)

	We already have spect.line.


Rick

------------------------------------------------------------------------ 
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Dr. Frederic V. Hessman      Hessman at Astro.physik.Uni-Goettingen.DE
Universitaets-Sternwarte     Tel.  +49-551-39-5052
Geismarlandstr. 11                Fax +49-551-39-5043
37083 Goettingen                 http://www.uni-sw.gwdg.de/~hessman
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