Symbiotic recurrent nova RS Oph in ourburst !!!

[Christophe Boussin]

Hello all,

Finally a clear sky to follow the evolution of the RS Oph outburst !!

Here is my contribution with a spectrum of the Halpha line at high resolution obtained on August 11 at 22 h 26 TU (resolution of 18696, JJ = 2459438.435) with my LHIRES III (grating of 2400 lines / mm, acquisition time of 30 min (3 x 600s)).

Halpha line of RS Oph on August 11th 2021

Halpha line of RS Oph on August 11th 2021 (zoom)

More than ever, clear skies to all !!

Christophe BOUSSIN

[Dubreuil Pierre]

Bonjour à tous

Un peu de ciel hier soir après des orages dans la journée.

Spectre réalisé avec le spectrographe UVEX(4) G600 750nm RC8 Slit 23µ ...
détails autour de O I 8446
François, si tu à quelques infos sur ce profil ?

Rs Oph proche IR

_nocacas2021_20210812_811_Pierre Dubreuil.png (9.23 KiB) Viewed 9718 times

Et avec H-Alpha

Rs Oph H-alpha + IR

Rs Oph 20210812_860_Pierre Dubreuil.png (9 KiB) Viewed 9601 times

j'envois le spectre FIT

Pierre

[Alun Halsey]

Having both my Alpy 600 and Lhires III attached to C9.25 via flip mirror I managed to acquire lo and hi res spectra last night (12th). Acquisition time for Alpy working at f/6,90 seconds (9x10sec) and
acquisition time for Lhires 21 minutes (7x180sec) both instruments with 23 micron slit.

rs oph_20210812T212639.png (26.93 KiB) Viewed 9709 times

_rsoph_20210812_926_alun halsey.png (7.12 KiB) Viewed 9709 times

Alun

[Joan Guarro Flo]

Hello,

You can see the general evolution of RS Oph.

J.Guarro.

[David Boyd]

Continuum flux level dropping as the magnitude fades, V=4.88, 5.44, 6.24 for the 3 spectra below.

H-alpha now less sharply peaked, line flux has increased 3 times, peak velocity relative to rest wavelength increased from ~+30 km/s to +120 km/s
H-beta narrower, line flux unchanged, peak velocity relative to rest wavelength increased from ~+160 km/s to +320 km/s
H-gamma narrower, line flux reduced by factor 0.4, peak velocity relative to rest wavelength steady at ~+360 km/s

David

rsoph_20210809_931_D_Boyd.png (45.9 KiB) Viewed 9676 times

RS Oph H-alpha.png (23.44 KiB) Viewed 9676 times

RS Oph H-beta.png (24.17 KiB) Viewed 9676 times

RS Oph H-gamma.png (23.14 KiB) Viewed 9676 times

[Robin Leadbeater]

Hi Alun,

Having both my Alpy 600 and Lhires III attached to C9.25 via flip mirror I managed to acquire lo and hi res spectra last night (12th).

That is an interesting setup. Do you have a photo? I considered doing the same with my C11 and even bought a 2nd hand 2 inch flip mirror but never got round to trying it so just have the two spectrographs ready wired up and swap them over onto the scope. How well does the EQ6 pro cope? I guess you need some counterweights on the scope to balance it.

Cheers
Robin

[Alun Halsey]

Hi Robin,

Rather than hijack this thread I will post a few photos of my setup in the "Spectroscopes and Software" section later today. I will add though that there is a lot of weight with the combined spectroscopes/cameras and because of that I prefer to use the CEM60 rather than the EQ6.

Cheers
Alun

[Christian Buil]

Three RS Oph observations night by using Star'Ex at the direct f/5 focus of a a 200 mm Newton (8-inch).

11.84 / 08 / 2021 : infrared by using a 600 lines/mm 750 nm blaze grating (R=1750) (note evolution of OI 8446 line relative to continuum):




12.89 / 08 / 2021 : H-alpha region by using a 2400 lines/mm grating (R=17000, very similar to Lhires III)):




13.84 / 08 / 2021 : UV by using a 2400 l/mm grating (R=6000 near 4000 A):



Note the detection of an emission on the H & K Ca II core lines:



For info, the UV spectrum of Vega by using the same setup:



Christian Buil

[Rainer Ehlert]

Hi,

Having read a lot about RS Oph I told myself maybe I try it. Maybe, because to the South my neighbour has a Palm tree and that one covers up the whole South

OK, I was lucky to get RS Oph between two branches

I took some images on August 10 as well as on August 12. See attached image.

Now I have a question. I guess comparing images with different exposure times is not a good idea, or ? August 10 I used 60 seconds and August 12 I used 120 seconds.

Telescope is a TOA 130 with a 0.6>X reducer with a LISA @25 µm slit and CCD camera QSI520i in binning 1x3.

Thanks in advance for your comments

Rainer

RS_Oph_20210810_palmera.jpg (198.97 KiB) Viewed 9557 times

[Christophe Boussin]

Hello all,

Here is my update for the monitoring of the outburst of RS Oph with a new spectrum obtained the 13th of August at 21 h 56 TU (resolution of 520, JJ = 2459440.4137) with my Alpy 600 and an acquisition time of 375 s (25 x 15 s) :

RS Oph on August 13th, 2021

_rsoph_20210813_914_Christophe Boussin_3700_7565.png (100.25 KiB) Viewed 9547 times

RS Oph on August 13th, 2021 (tentative identification of some lines from PlotSpectra)

Clear skies to all !!

Christophe BOUSSIN