[vsnet-alert 10776] re nova in Sgr

[bydra at Safe-mail.net]

Hiroyuki Maehara informed :-

"CBET 1591 has also reported that a pair of objective-grating spectrograms taken on Nov. 30.013 by W. Liller shows a very strong H-alpha emission with a FWHM of ~2500km/s."

Hello there

Is the size of 'scope used for the object grating spectrograms quoted at all, please?  Hopefully not the same device used to gain that precision of astrometry if a FHWM is being quoted from it.

Could any spectroscopists comment on what sort of minimal resolution is needed for even to the nearest 1000 km/s scale FWHM of Halpha to be measured, please?

Lots of data quoted across the board nowadays is getting quoted pretty much uncontextualised, and it gets very difficult to assess if the results drawn from them are feasible, let alone meaningful.

I'm sure it's a nova and all, that's not what I'm worried about.

Cheers

John

John Greaves