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Re: V694 Mon revisted

PostPosted: Sat Mar 10, 2018 1:17 pm
by 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:
Image
Hb region:
Image
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

Re: V694 Mon revisted

PostPosted: Sun Mar 11, 2018 5:45 pm
by umberto sollecchia
Bonjour à tous, placez le profil de l'observation du 09-03-2018. Umberto

v694mon_20180309_795_Umberto Sollecchia.png
v694mon_20180309_795_Umberto Sollecchia.png (21.47 KiB) Viewed 2641 times

Re: V694 Mon revisted

PostPosted: Wed Mar 21, 2018 9:04 am
by James Foster
Another spectra between Southern California rain storms....V0694 Mon around CaK:
Image
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

Re: V694 Mon revisted

PostPosted: Sun Sep 09, 2018 12:21 pm
by 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:
v694mon_20180909_139.gif
Fresh 1 x 10 minuter
v694mon_20180909_139.gif (14.71 KiB) Viewed 2266 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

Re: V694 Mon revisted

PostPosted: Mon Sep 10, 2018 1:13 pm
by 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/InformationLetter/ARAS_EruptiveStars_2018-02.pdf
All the best

François

Re: V694 Mon revisted

PostPosted: Sun Sep 30, 2018 11:38 am
by Peter Somogyi
Today morning's result - similar, in a better quality (5 x 10 mins):
v694mon_pso_20180929.gif
v694mon_pso_20180929.gif (20.94 KiB) Viewed 2058 times

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

- Peter

Re: V694 Mon revisted

PostPosted: Sat Oct 06, 2018 1:00 pm
by 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
v694mon_hires_pso_20181006_enlarged.gif (17.06 KiB) Viewed 1989 times

A year-to-year comparative evolution (all spectra captured by me):
v694mon_hires_pso_2015_2018.gif
v694mon_hires_pso_2015_2018.gif (51.02 KiB) Viewed 1989 times

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

Peter

Re: V694 Mon revisted

PostPosted: Thu Oct 25, 2018 4:26 pm
by Peter Somogyi
With a fresh result from this cloudy morning, presenting H-alpha evolution in the past few weeks:
v694Mon_Ha_full.gif
v694Mon_Ha_full.gif (42.03 KiB) Viewed 1859 times

The essence of changes require magnification + good SNR:
v694Mon_Ha_velo_magnified.gif
v694Mon_Ha_velo_magnified.gif (48.17 KiB) Viewed 1859 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

Re: V694 Mon revisted

PostPosted: Tue Nov 06, 2018 9:38 am
by 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
v694 Mon_Ha.png (51.26 KiB) Viewed 1684 times

v694 Mon_Hb.png
v694 Mon_Hb.png (23.08 KiB) Viewed 1684 times


The lightcurve:
AAVSO_V.PNG
AAVSO_V.PNG (7.58 KiB) Viewed 1684 times


François

Re: V694 Mon revisted

PostPosted: Fri Nov 23, 2018 9:50 am
by James Foster
Here is a long wavelength (4000-9550A) of V0694 Mon I did from my high altitude side on 2 separate nights:
Image
I'm going to try this again in December's new moon if the weather holds, with 2 telescopes shooting simultaneously.

James