V694 Mon revisted

[James Foster]

Here are some more LhiresIII spectra of V0694 Mon done before inclement weather set in (used HD071155 at instrument calibration reference star):
Ha region:

Hb region:

There were quiet a few emission line around the emission spike of the H-Beta line; I could only identify the FeII line around 4923.92A.
Just a few more weeks before this goes too far west and too low for high quality spectrum.

James

[umberto sollecchia]

Bonjour à tous, placez le profil de l'observation du 09-03-2018. Umberto

v694mon_20180309_795_Umberto Sollecchia.png (21.47 KiB) Viewed 11693 times

[James Foster]

Another spectra between Southern California rain storms....V0694 Mon around CaK:

There has been a decrease in the H-zeta & CaK line activity as compared with the 08Feb18 spectra. Of course, since this band
is susceptible to poor atmospherics, it might be that these lines suffered from UV absorbing aerosols and/or low altitude observation.

James

[Peter Somogyi]

Hello,

Opening the new season for v694 Mon: a fresh, lucky 1x10 minuter at the lowest level I can shoot v694 Mon from this morning - the P-Cyg profile has mostly vanished (a very rare state), uncovering a blue wing:

Fresh 1 x 10 minuter

v694mon_20180909_139.gif (14.71 KiB) Viewed 11318 times

Had to wait like 30 minute to rise above a tree, and had to move the next 10-minuter to trash because of too much sunlight contamination and poor guiding against rising sun.
The two wings confirmable visually on the raw image, and the removed background is a bit contaminated by the Sun's H-beta absorption (that is narrower than the wings).
I'd appreciate if somebody could confirm the existence of the blue wing, as once I've had hard times to prove such a validity for a professional.

- Peter

[Francois Teyssier]

Interesting, Peter
You've an the blue end of the line in faint emission
The last spectrum obtained by Umberto shows a very weak blue absorption
See
http://www.astrosurf.com/aras/novae/Inf ... 018-02.pdf
All the best

François

[Peter Somogyi]

Today morning's result - similar, in a better quality (5 x 10 mins):

v694mon_pso_20180929.gif (20.94 KiB) Viewed 11110 times

This SNR would allow high resolution (maybe next time).
A narrow absorption is definitely still there (as previous result suggested).

- Peter

[Peter Somogyi]

Fresh result from this morning, a similar structure at H-alpha - this time high resolution (R~12000):

v694mon_hires_pso_20181006_enlarged.gif (17.06 KiB) Viewed 11041 times

A year-to-year comparative evolution (all spectra captured by me):

v694mon_hires_pso_2015_2018.gif (51.02 KiB) Viewed 11041 times

The plateu suddenly drops at -800 and +900 km/sec.

Peter

[Peter Somogyi]

With a fresh result from this cloudy morning, presenting H-alpha evolution in the past few weeks:

v694Mon_Ha_full.gif (42.03 KiB) Viewed 10911 times

The essence of changes require magnification + good SNR:

v694Mon_Ha_velo_magnified.gif (48.17 KiB) Viewed 10911 times

Although there have been no remarkable change between 10.06 and 10.13, the V wing has increased by now (whilst the R side remained proportional to the H-alpha intensity).
Perhaps (hard guess), a V-side peak is uncovering?

- Peter

[Francois Teyssier]

That's very interesting, Peter.
I don't remember such profiles in the various publications about V694 Mon
It could be interpreted as the weakening or loss of the jets
Of course, monotoring of MWC560 is strongly recommended.

H alpha and H beta this year from spectra obtained by Peter and Umberto
showing the sudden changes of the profiles.

v694 Mon_Ha.png (51.26 KiB) Viewed 10736 times

v694 Mon_Hb.png (23.08 KiB) Viewed 10736 times

The lightcurve:

AAVSO_V.PNG (7.58 KiB) Viewed 10736 times

François

[James Foster]

Here is a long wavelength (4000-9550A) of V0694 Mon I did from my high altitude side on 2 separate nights:

I'm going to try this again in December's new moon if the weather holds, with 2 telescopes shooting simultaneously.

James