VY Scl CVs campaign for HST

[2SPOT]

Following the AAVSO alert :
https://www.aavso.org/vy-scl-stars-too-campaign-02

Here's two spectra taken from Chile with an Alpy 600 and RC12

[Christian Buil]

A coordinated observation with Olivier for an instructive comparison.

The star VY Scl observed this time from France, but at the very low elevation of 14° above horizon (very strong absorption in the blue because of the air mass). I used a 8-inch Newton only and the Star'Ex spectrograph configured for low spectral resolution (300 lines/mm grating, R = 850 - see description here, at point 4.4 http://www.astrosurf.com/solex/sol-ex-stars-en.html):



Of course, much more noise than in the spectrum of Olivier, but it remains readable (the star is actually at V=12.7).

During the same session and with the same setup, the cataclymic star V794 Aql at V = 15.0:



and the star V704 And spectrum:



Christian Buil

[Christian Buil]

Another spectrum of southern star VY Scl from Antibes (2-hours exposure, Star'Ex spectrograph oil a 10-inch f/4 telescope):



Also a spectrum of GK Per in actual outburst (it's the nova 1901):

http://www.astrosurf.com/buil/forum27/_ ... 07_057.png

A view of the setup:



Christian BUIL