PU Vulpecula with many emission lines - 27Aug17

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PU Vulpecula with many emission lines - 27Aug17

Postby James Foster » Tue Sep 12, 2017 7:47 pm

As part of the efforts to acquire spectra of lesser observed objects, I acquired this spectrum of PU Vulpecula on 27Aug17
from my high altitude/dark sky site at Mt. Pinos, CA:

Image

While looking at the 2D image of the spectrum, this objects had so many emission spikes I thoughts it could be a nova; see 2D image after Isis V1.90 processing:

Image

According to the Kyoto cataclysmic stellar data base, this is a Z Andromeda (or Z And/NC) type, trinary system whose main components are a set
of A4II-F8Iab+M6IIIe stars. Its well placed for observation, near +22 declination. I'll definitely add this to my regular photometry/spectra target list.

James
James R. Foster
Lhires III (2400 & 1800 ln/mm Grat) Spectroscope,
LISA Visual & IR Kit Spectroscope, and
Star Analyzer 200
James Foster
 
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Re: PU Vulpecula with many emission lines - 27Aug17

Postby Francois Teyssier » Wed Sep 13, 2017 5:12 pm

Excellent, the LISA is well tuned
and correct identitification of the lines. You have also the second Raman OVI at ~ 7080.
On such a spectrum, you can estimate the electronic temperature from [OIII] lines

Yes, it a symbiotic star and more precisely a symbiotic nova (1979)
Very long plateau maximum ~ 8 years before decline and a deep eclispe just after the outburst
PUVul.PNG
PUVul.PNG (5.17 KiB) Viewed 78 times




The reference catalog for symbiotics is
https://aas.aanda.org/articles/aas/pdf/2000/18/h2255.pdf
A little bit old (2000) but still very usefull

The composition of the system is still subject of discussion


François
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