T CrB before its new nova event

Francois Teyssier · Post by **Francois Teyssier** » Sat May 25, 2024 2:03 pm

After a short "flare" (less than 10 days) T CrB returns to very activity with H alpha very faint.

H alpha lux from flux calibrated spectra:

http://www.astronomie-amateur.fr/Erupti ... a_2024.png

Link to the page: http://www.astronomie-amateur.fr/Erupti ... TCrB0.html

François Teyssier

Francois Teyssier · Post by **Francois Teyssier** » Fri Jun 14, 2024 7:19 pm

Faint enhancement of B and V mag
Current orbital cycle in black.
It will be interesting to see how Balmer lines reacts.

: TCrB_2024-06-14.PNG (112.17 KiB) Viewed 986 times

Joan Guarro Flo · Post by **Joan Guarro Flo** » Mon Jul 01, 2024 9:05 am

Hello at all,

T CrB continues showing its secrets, you can see here some aspects of some of its Hydrogen lines and its oxygen line on 5577 Angs.

These graphics were the outcomes of observations with the Piera Remote Observatory equipment.

Best regards, J.Guarro.

Joan Guarro Flo · Post by **Joan Guarro Flo** » Mon Jul 01, 2024 10:01 am

Hello everyone again,

Photometry is a very nice complementary tool to spectroscopy, in this way, I made some tests with different options, equipment, and software.

Nowadays, it seems that the best software for photometry is the AstroImageJ one, the procedure is to use one star as a comparison and one or two more as a check star.

I have been obtaining acceptable results with one old Comet Catcher, 140mm. diameter 500mm. focal length plus a Bessel V filter and an ATIK 460EX camera.

With this equipment, and meanwhile, I was taking spectroscopy to T CrB, I took advantage of taking photometry of this star too. You can see some pictures of it, if you need more information don't hesitate to contact me.

Best regards, J. Guarro.