V694 Mon revisted

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Re: V694 Mon revisted

Postby James Ley » Mon Jan 21, 2019 2:28 am

I was only able to record one acquisition of 300s before the clouds rolled in.
V694 Mon full 300s.png
V694 Mon full 300s.png (13.94 KiB) Viewed 1007 times

I see the Hydrogen Balmer lines without p-cygni profiles but many metal lines with p-cygni profiles.
V694 Mon P-Cygni.png
V694 Mon P-Cygni.png (18.47 KiB) Viewed 1007 times

AAVSO suggests continuing brightening, similar to 2016.
V694Mon AAVSO.png
V694Mon AAVSO.png (59.7 KiB) Viewed 1007 times


Is V694 Mon in outburst?
Shelyak Alpy 600 (spectroscope, guiding module and calibration module) | GSO 6" f/6 | Orion Atlas Pro | ZWO ASI178MM-Cool (mono) | ZWO ASI290 Mini (mono)
"think like a photon" -- Steve Shore
James Ley
 
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Re: V694 Mon revisted

Postby Francois Teyssier » Mon Jan 21, 2019 6:17 pm

Hi James,
Yes, Balmer lines are in (almost) pre emission since october, with just a faint absorption at about -200 km/s
See information letter 2018-03, p. 88 : http://www.astrosurf.com/aras/novae/InformationLetter/ARAS_EruptiveStars_2018-03.pdf,
ATel 12231 http://www.astronomerstelegram.org/?read=12231 with spectra obtained by Peter Somogyi and http://www.astronomerstelegram.org/?read=12227
I'm not conviced by the identification of He I lines 4922 and 5016 as stronger than Fe II. But unfortunately, we have no high res spectra for Hbeta region in november.
This is a peculiar state for this star. The optical outburst (luminosity) is clear from AAVSO data.
But the concept of outburst is unclear for this star which is in permanent outburst, with strong variations of the absorptions in Balmer lines with terminal velocities chnaging from ~ 1000 to 8000 km/s
Your spectrum in welcome in the database.

Monitoring of the fascinating star is recommended until spring


Best,
François
Francois Teyssier
 
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Location: Rouen

Re: V694 Mon revisted

Postby James Ley » Thu Jan 31, 2019 2:42 am

Thank you Francois for your kind words and encouragement.
Here is a spectrum that I took last night.
V694 Mon full.png
V694 Mon full.png (12.53 KiB) Viewed 930 times

This was 10 x 600s. That certainly increased the signal to noise ratio!
Do you think that these profiles suggest absorption of H-beta and H-alpha?
V694 Mon H-beta.png
V694 Mon H-beta.png (16.27 KiB) Viewed 930 times

V694 Mon H-alpha.png
V694 Mon H-alpha.png (13.34 KiB) Viewed 930 times


Considering once again your excellent diagram
V694Mon.PNG
V694Mon.PNG (89.64 KiB) Viewed 930 times

By definition, one will only see the emissions you show from the accretion disk if the disk is optically thin. Is it possible that, due to increased mass transfer, the disk has become optically thick (to H-alpha at least) and that the H-alpha emission is coming from further out and therefore is not absorbed by the jet? Does that make sense?
Regards,
James
Shelyak Alpy 600 (spectroscope, guiding module and calibration module) | GSO 6" f/6 | Orion Atlas Pro | ZWO ASI178MM-Cool (mono) | ZWO ASI290 Mini (mono)
"think like a photon" -- Steve Shore
James Ley
 
Posts: 48
Joined: Tue Jan 23, 2018 6:57 pm

Re: V694 Mon revisted

Postby James Foster » Thu Feb 14, 2019 9:03 pm

Here is my most recent result for low resolution Alpy600 (Vis) and LISA (Ir) on V694 Mon:
Image
I'll try to post my photometry data as I have been shooting this object every clear night with the C-11
and ST-8xme with Astrodon photometric filters.
James Foster
Lhires III (2400/1800/600 ln/mm Grat) Spectroscope,
LISA IR/Visual Spectroscope (IR Configured Presently)
Alpy 600 with Guide/Calibration modules and Photometric slit
Star Analyzer 200
James Foster
 
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