CI Cygnus

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James Foster
Posts: 439
Joined: Sun Jan 24, 2016 7:14 am

CI Cygnus

Post by James Foster »

Here is a 26Apr17 spectra of CI Cyg:
Image
I stacked a 359% stretch of the continuum to show the more subtle features.
As always, the line identifications beyond the balmer H are tentative.

James
James Foster
eShel2-Zwo ASI6200MM Pro
Lhires III (2400/1800/600 ln/mm Grat) Spectroscope
LISA IR/Visual Spectroscope (IR Configured)
Alpy 200/600 with Guide/Calibration modules and Photometric slit
Star Analyzer 200
Francois Teyssier
Posts: 1520
Joined: Fri Sep 23, 2011 1:01 pm
Location: Rouen
Contact:

A

Post by Francois Teyssier »

Dear James,

There's a problem of method
You can't imagine, from the huge list of lines for the various elements and ions, the identification.
As an example, if you take the full list of Fe lines, any line could (wrongly) be identified as an Fe line

For highly ionized symbiotics :

You begin by Balmer identification : good
and with the other recombination lines, notably He I: good

Then see He II lines (4686)

After, go to "forbidden lines"
For classical symbiotics (CI Cyg), [Fe VII] are prominent (out of outburst)

Last, Hg, if real, isn't a line of the star spectrum. Light pollution. Strangly, it is very intense on your spectrum.

En résumé: a good start is studying the prublished identifications. It is sufficient for low res spectra.

All the best,

François

PS: if you agree, your spectra are wlcome in ARAS Database
James Foster
Posts: 439
Joined: Sun Jan 24, 2016 7:14 am

Re: CI Cygnus

Post by James Foster »

To: François,

RE:"Last, Hg, if real, isn't a line of the star spectrum. Light pollution. Strangely, it is very intense on your spectrum."

Yes I understand....its definitely not stellar. I'm about 8 miles e. of downtown Los Angeles (2nd most populated city in US). My sky here is much worse than Christian Buil's!
These Hg lines are usually subtracted out by sky brightness cancellation in IS, but they have shown after IS processing and IR correction on especially bad
nights (mostly on LISA spectra); i.e. poor seeing and/or misty air. I look forwards to using the LISA spectroscope from my dark sky site at Mt. Pinos 90 miles NW of LA
and 2500 meters elevation.

RE:"if you agree, your spectra are welcome in ARAS Database"

I've emailed Olivier for registration into the ARAS database, but no answer so far. I would be happy to submit my IS processed spectra (minus any line identifications)
to this database. I've submitted over 60 spectra to the BAA spectra database, including my Solar Analog and VV Cep spectra.

James
James Foster
eShel2-Zwo ASI6200MM Pro
Lhires III (2400/1800/600 ln/mm Grat) Spectroscope
LISA IR/Visual Spectroscope (IR Configured)
Alpy 200/600 with Guide/Calibration modules and Photometric slit
Star Analyzer 200
Francois Teyssier
Posts: 1520
Joined: Fri Sep 23, 2011 1:01 pm
Location: Rouen
Contact:

Re: CI Cygnus

Post by Francois Teyssier »

Dear James,

There's no registration for the database,
You've just to send me the files by private email (francoismathieu.teyssier at bbox.fr)

The light pollution is very impressive!


Bonne continuation,

François
James Foster
Posts: 439
Joined: Sun Jan 24, 2016 7:14 am

Re: CI Cygnus

Post by James Foster »

To: François,

Just emailed you 15 LISA/L-200 spectra.
More to follow if these look good enough for
ARAS/BeSS database.

James
James Foster
eShel2-Zwo ASI6200MM Pro
Lhires III (2400/1800/600 ln/mm Grat) Spectroscope
LISA IR/Visual Spectroscope (IR Configured)
Alpy 200/600 with Guide/Calibration modules and Photometric slit
Star Analyzer 200
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