Symbiotics with eShel 18-04-2015

[Francois Teyssier]

TX CVn Mag V = 9.8
[O I] faint in emission

_txcvn_20150418_851_6000-6800.png (30.98 KiB) Viewed 3836 times

T CrB Mag V = 9.9

_tcrb_20150418_928_5700-6800.png (20.84 KiB) Viewed 3830 times

_tcrb_20150418_928_Ha.png (12.1 KiB) Viewed 3830 times

CH Cyg

_chcyg_20150418_983_4200-5700.png (27.12 KiB) Viewed 3829 times

_chcyg_20150418_983_5700-7200.png (19.79 KiB) Viewed 3829 times

_chcyg_20150418_983_Ha.png (10.48 KiB) Viewed 3829 times

V1016 Cyg (Symbiotic nova) Mag Vis = 11 Mag V = 11.5

_v1016cyg_20150415_128_4200-5700.png (11.99 KiB) Viewed 3822 times

_v1016cyg_20150415_128_5700-7200.png (11.39 KiB) Viewed 3822 times

See the [NII] profile

_v1016cyg_20150415_128_6500-6600.png (14.4 KiB) Viewed 3822 times

[Tim Lester]

Very nice spectra Francios! You have your eShel tuned up nicely. I am impressed with the S/N you are getting at this resolution (I assume you have some fiber coupling losses).
Everything must be well optimized plus excellent guiding. I have been downloading your spectra from the database to view them.
The graphs just can't do them justice.

Tim

[Peter Somogyi]

T CrB with the same exposure time, switched to 35um slit (R~13K) and 2x2 bin, looks the small ripples on the continuum are also real:

Peter

[Francois Teyssier]

Tim,

The mount is an astrophysics 1600, autoguiding with Lodestar and Maxim DL : no problem, the RMS is less than 0.5 px
The (new) scope is a Meade ACF 850 - 14 ". Good quality of the optics.
The focal ratio is F/D = 8 (small for a SC) - The focal reducer (Lumicon, an excellent optics) gives F/D = 4.8
The collimation is correct
The focus is optimized

The seing was good (can't be tuned ... !), good transparency and the altitude of the targets above 50°

As you know, this is the secret of spectroscopy : *ALL* all must be fine tuned.

As soon as possible, I'll try CI Cygni.

Note that Peter got a correct spectrum of YY Her, very faint target, at R > 15000 (soon in the data base)

All the best,

François