Get Gaia prism spectra for all the stars!

[zkbt]

Gaia has observed low-resolution spectra of basically all the stars and high resolution radial velocity + stellar characterization spectra for bright stars. It would be super neat to be able to plot spectra and/or label with stellar spectral types next to many of the bright stars in a field.

Starting from the existing get_gaia, this would involve downloading spectra and/or additional table columns. A few starting steps would be:

• [x] find and plot a Gaia prism spectrum of a star
• [x] figure out how to programatically download one prism spectrum, and plot it
• [x] figure out how to use ADQL to download lots of spectra at once, which might be faster than one at a time

[zkbt]

I think https://www.cosmos.esa.int/web/gaia/gaiaxpy is probably essential here! The prism spectra are stored in (probably very clever but also deeply non-intuitive) weird orthonormal bases, and this tool helps with the math to get to actual spectra.

[zkbt]

@Autumn10677 , I think starting with the light curves before this might be wise?