v694 Mon

Information about outbursts of eruptive stars, Be activity, ...
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Francisco Campos
Posts: 88
Joined: Sun Nov 29, 2015 10:13 pm

v694 Mon

Post by Francisco Campos »

Bonsoir,

dans le forum AAVSO on announce que la variable symbiotique v694 Mon est en éruption. Je suis en train d'acquirer un spectre où je vois des fortes profiles P.Cygni dans toutes les bandes de Balmer.

Bien cordialement
Fran
David Boyd
Posts: 161
Joined: Wed Dec 11, 2013 5:50 pm

Re: v694 Mon

Post by David Boyd »

Here is a spectrum of V694 Mon taken last night 3rd February starting at 22.00 UT. Its magnitude measured simultaneously with the spectrum and used to flux calibrate was V=9.12, almost 0.4 mag brighter than 2 weeks ago. There are strong P-Cygni profiles on all Balmer lines reaching a blue-ward extent on H-alpha of ~2500 km/s relative to the peak of emission. Spectrum sent to the database.

David
_v694mon_20160203_920_D.Boyd_flux.png
_v694mon_20160203_920_D.Boyd_flux.png (27.16 KiB) Viewed 11604 times
Martin Dubs
Posts: 141
Joined: Fri Jan 06, 2012 9:16 pm
Location: Maienfeld, Switzerland

Re: v694 Mon

Post by Martin Dubs »

Hello,

I tried to download a spectrum from http://www.astrosurf.com/aras/Aras_Data ... iotics.htm,
but the links on that page do not work (local computer of Francois). Other links to Novae etc. work without problem. Please check.

Regards, Martin
Francisco Campos
Posts: 88
Joined: Sun Nov 29, 2015 10:13 pm

Re: v694 Mon

Post by Francisco Campos »

Hi,

the promised spectrum taken yesterday. The resolution is not as good as David one's (good job!), but happy to see how the DADOS works:
_v694mon_20160203_911_fpc.jpg
I have calculated Doppler shifts for the main Balmer bands, but my results are considerably lower than David one's: 1300-1600 km/s. Difficult to measure, due to the very broad absortion peak.

Greetings
Fran
umberto sollecchia
Posts: 242
Joined: Tue Dec 30, 2014 3:25 pm

Re: v694 Mon

Post by umberto sollecchia »

Bonjour à tous, voici ma contribution.
Profilo v694mon.png
Profilo v694mon.png (5.53 KiB) Viewed 11537 times
cordialement Umberto
Paolo Berardi
Posts: 578
Joined: Thu Sep 29, 2011 10:51 pm

Re: v694 Mon

Post by Paolo Berardi »

Fran, thank you for reporting the outburst. My observations for February 2016, 5 and 6. H-alpha and H-beta. Lhires III 1200 & C9.25.

H-alpha region:

Image

H-beta region:

Image

Radial velocity of heliocentric corrected profiles (note there is a day apart):

Image

With reference to classification by Iijima (2002), see ARAS Eruptive Stars Information letter n. 11 30/11/2014, it seems that at present there is no flat continuum between the absorption and emission components of H-beta line and the red side of absorption isn't steep. Furthermore, the blu-shifted absorption does not reach high velocities observed during the active stage. This should indicate that currently the star is in the stable stage (type A). Is it possible? I read that sometime the active stage occours without significant brightening in the V band, so the events are not always related.

Paolo
Peter Somogyi
Posts: 420
Joined: Sun Jul 13, 2014 8:56 am

Re: v694 Mon

Post by Peter Somogyi »

I was shooting it with Paolo in parallel on Feb-6 night at H-beta with 600/mm grating + 35um slit (somehow my coverage is also similar), but I was hunting for short-term changes, with per-exposure calibration before/after (using 2 ref. stars). First 2 x 20 minute were continuous, then the next 3 ones was 1 x 20 minute per each (shooting other targets in between), normalized for 4600-4800A:
v694mon_20160206_744_965.gif
v694mon_20160206_744_965.gif (119.59 KiB) Viewed 11414 times
It tells H-beta was definitely increasing, and maybe some other lines suspected for variation.
The velocities did not seem to change at this resolution, remained very much the same as Paolo published at H-beta.

Happy hunting!
- Peter
Paolo Berardi
Posts: 578
Joined: Thu Sep 29, 2011 10:51 pm

Re: v694 Mon

Post by Paolo Berardi »

Hi Peter, that is very interesting. The emission growth (H-beta peak and EW) is also discernible on my spectra from 6.843 to 6.888 Feb 2016 (a shorter period):

Image

Paolo
umberto sollecchia
Posts: 242
Joined: Tue Dec 30, 2014 3:25 pm

Re: v694 Mon

Post by umberto sollecchia »

Bonjour à tous, placez le profil d'observation de 11/02/2016.
profilo v694mon.png
profilo v694mon.png (6.08 KiB) Viewed 11319 times
@Anim.gif
@Anim.gif (92.47 KiB) Viewed 11209 times
Cordialement Umberto
Last edited by umberto sollecchia on Sun Feb 14, 2016 12:50 pm, edited 2 times in total.
Peter Somogyi
Posts: 420
Joined: Sun Jul 13, 2014 8:56 am

Re: v694 Mon

Post by Peter Somogyi »

Quick result from yesterday:

LHires III/600/35um/ATIK 414/25cm
v694mon_20160206_778_vs_891.png
v694mon_20160206_778_vs_891.png (28.42 KiB) Viewed 11295 times
All the 3 calibrations (ref.star/ArNe/flat) taken twice before and after again.

It is interesting that H-beta absorption had almost unchanged, while the multiplet to the right seemingly broadened by their absorb feature (look at the 3 peaks to the right)!
Does anybody know the name of that multplet?

/ Peter
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