RT Cru brightening - Spectra requested

RT Cru brightening - Spectra requested

Postby Francois Teyssier » Wed Jul 08, 2020 3:52 pm

Juan Luna - CONICET-Universidad de Buenos Aires, Instituto de Astronom´ıa y Fısica del Espacio (IAFE) - draws out attention on a brightening of the symbiotic star RT Cru:

I would like to call the ARAS observers attention and encourage them to follow spectroscopically RT Cru, given that it is recovering from the low state and we suspect that Halpha and other emission lines should appear now or soon.

Send spectra to francoismathieu.teyssier at bbox.fr for inclusion in the database:
http://www.astrosurf.com/aras/Aras_DataBase/Symbiotics/RTCru.htm

AAVSO lightcurve:
RTCru.PNG
RTCru.PNG (8.68 KiB) Viewed 607 times




Thanks
Francois Teyssier
 
Posts: 1345
Joined: Fri Sep 23, 2011 1:01 pm
Location: Rouen

Re: RT Cru brightening - Spectra requested

Postby Francois Teyssier » Sun Sep 06, 2020 8:28 am

Juan Luna is recalling his request of spectra of RT Cru.
RT Cru is now observable in the morning sky for southern observers.
It remains at high luminosity (~ 12.3) according to recent observations in AAVSO data:

RTCru.PNG
RTCru.PNG (9.2 KiB) Viewed 315 times


Comments from Juan:

During the last month or so, the Swift BAT flux has been steadily increasing and is coming out of the minimum that started about 1-2 years ago. Spectra now and for the next 6 months will be really useful as this is an opportunity that might happen again in ~10 years (if this is indeed periodic as we suspect).
We expect that the optical spectra should have strong Halpha and may be other emission lines.

Thanks for your help and best regards
-Juan



Thanks in advance for the spectra.
François
Francois Teyssier
 
Posts: 1345
Joined: Fri Sep 23, 2011 1:01 pm
Location: Rouen

Re: RT Cru brightening - Spectra requested

Postby Peter Velez » Tue Sep 08, 2020 4:41 am

This was a challenging task - I started imaging last night when the target was at around 33 degrees altitude and it dropped away from there. I was surprised that it didn't slip below the walls of the observatory. I shot 2 separate sets of images and have processed them separately.

Here are the results. Very ordinary spectral calibration and low SNR. But it does show Ha emission and a few other interesting emissions.

I will give it another go tonight - weather permitting.

Pete
Attachments
rt_cru_20200907_370_Peter Velez.png
Peter Velez
 
Posts: 69
Joined: Tue May 12, 2020 7:36 am

Re: RT Cru brightening - Spectra requested

Postby Francois Teyssier » Wed Sep 09, 2020 6:56 pm

That's excellent, Peter
I think you have also He I 5876 and probably [OIII]

Comments from Juan Luna:

Thanks a lot for taking this!, it is exactly what I was expecting!, Halpha emerged. Ideally we would love a weekly cadence, but I know it is difficult, so anything between once a week and once a month would be greatly appreciated.

All the best,

François
Francois Teyssier
 
Posts: 1345
Joined: Fri Sep 23, 2011 1:01 pm
Location: Rouen


Return to Symbiotic Stars

Who is online

Users browsing this forum: No registered users and 1 guest

cron

x