V694 Mon

V694 Mon

Postby Francois Teyssier » Wed Sep 11, 2019 9:13 pm

MWC560 = V694 Mon reappears in the morning sky sky.
The star is still very bright. Mag V = 8.8 on Sept. 8.8
Margarita Karovska have submitted observations from Chandra+HST+XMM and request visible spectra asap.

François
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Re: V694 Mon

Postby Peter Somogyi » Sun Sep 15, 2019 11:43 am

Fresh results from this morning:
v694_Mon_comparison.jpg
v694_Mon_comparison.jpg (76.12 KiB) Viewed 4707 times

After shooting H-beta (2 x 600 sec), quickly switched to the H-alpha region (1 x 600 sec, sun background could be substracted easily):
v694_Mon_Ha.jpg
v694_Mon_Ha.jpg (57.23 KiB) Viewed 4707 times

It looks to be continuing in similar state as this year spring.
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Re: V694 Mon

Postby Francois Teyssier » Mon Sep 16, 2019 5:13 pm

That's excellent, Peter.
Yes, only weak absorptions at moderate velocities (-200 to -250 km/s for HI)

Of course, continuing moritoring is welcome.
François
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V694 Mon spectra in support to HST FUV/NUV observation

Postby Francois Teyssier » Thu Oct 17, 2019 5:57 pm

A request forwarded by Adrian Lucy (fruitful collaboration on Symbiotics powered accreted and search for new symbiotics stars):

Fred Bruhweiler and Bruce McCollum (cc'd) have secured some HST time to look at the FUV/NUV spectrum of V694 Mon (=MWC 560). The observations are scheduled for 23 October 14:50 to 18:55 GMT.

They were hoping for at least one simultaneous spectrum of the optical absorption lines (at least H-alpha, but e.g. the other Balmer lines would be great too).

There are a lot of observers who like this target (http://www.astrosurf.com/aras/Aras_Data ... 694Mon.htm), most recently Peter, and it would be great to get a feel for the status of the optical lines and their variability within a day or so of the observation.

But it would be *especially* nice to get exactly simultaneous observations, which would require observers in Australia, Japan, Korea, or elsewhere in Asia (or maybe Hawaii, though that'd be pushing it).

Even one spectrum during the HST observations 23 October 14:50 to 18:55 GMT would be extremely useful. Of course, the UV observations will be time-tagged, so if anyone has some extra spare time on their hands, it could also be interesting (but certainly not mandatory) to just sit on the target for a few hours and track variability in the optical lines.


Spectra at low resolution (LISA, ALPY, ...) and high (Echelle, Lhires, L200 ...), (in amateur sense ) resolution are very welcome from 22 to 24th of October. They will to appreciate the variability of the system around the scheduled HST observation.

For Lhires ... : H alpa, H beta and the Fe II (42) multiplets

Current Vmag = 8.9

Spectra to be send to francoismathieu.teyssier bbox.fr for inclusion in the data base

Clear Skies!

François, David, Woody
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Re: V694 Mon

Postby Hamish Barker » Fri Oct 18, 2019 1:23 am

Looks like very early morning observation required here in new Zealand. I will try with my L200.
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Re: V694 Mon

Postby Francois Teyssier » Fri Oct 18, 2019 4:19 am

Hamish,
Which grating equip your L200 ?

François
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Re: V694 Mon

Postby Peter Somogyi » Sun Oct 20, 2019 1:17 pm

2019.10.20 morning, with LHires III + 600/mm + 35 micron slit + ATIK 428 + 300/1200 Newton (+ APM 2.67x barlow), variable sky:
- H-alpha @ R~2500
- He/Ne (~5800A) region @ R~2000=
- H-beta @ R~1800

Not much change within a month at this resolution, except H-alpha changed somewhat:
cmp_Ha_Hb.png
graphs produced with PlotSpectra
cmp_Ha_Hb.png (124.74 KiB) Viewed 4037 times


Velocity view (Balmer - logarithmic):
sub_and_velo.png
graphs produced with PlotSpectra
sub_and_velo.png (95.52 KiB) Viewed 4037 times

Beware, colors not maching across graphs! (noticed later)
All intensities are relative, no flux.

Next switching to 2400/mm grating (allows H-alpha @ R~13000, or H-beta @ R~8500 with wider coverage).
Being on vacation next week + weather looks promising, so planning repeats on workdays.

Cheers,
Peter
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Re: V694 Mon

Postby Peter Somogyi » Tue Oct 22, 2019 12:08 pm

Fresh spectra from this morning, having switched to 2400/mm grating:
- 4 x 20 min. H-alpha (R ~ 15000, 6500 - 6610A)
- 5 x 10 min. H-beta (R ~ 9000, 4817 - 4961A), includes Fe I emissions + He I 4922 absorption

Velocity plot (the H-alpha is comparative to half year before):
v694Mon_velocities.png
generated via PlotSpectra + Paint (cut & paste screen capture)


Cheers,
Peter
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Re: V694 Mon

Postby Forrest Sims » Tue Oct 22, 2019 12:33 pm

I also just acquired this fresh spectrum of V694 Mon with my LISA. This is 22 120sec exposures. I am still taking more exposures up until daylight. Also I have simultaneous VBand data for that last nearly two hours.

Woody
Attachments
v694mon_20191022_452_Forrest Sims.png
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Re: V694 Mon

Postby Terry Bohlsen » Thu Oct 24, 2019 9:00 am

I also succeeded in taking spectra of this star last night.
Similar to Forrest's data.
Cheers
Terry
v694mon_20191023_667_TBohlsen.png
Terry Bohlsen
Armidale NSW
Australia
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