spectro-aras.com

Recent spectrum

Active state with EW(H alpha) ~ 15 ans EW (He II) ~ 3.5.


TCrB_echelle.png

Note the complex profile of H beta and He I 5876 with 3 apparent peaks.

This spectrum is a textbook case showing that H alpha is far to be the best Balmer line for astrophysics studies : too much ...

Update with an altazimutal map for Northern observers at 00:00 UT - latitude = 0° (Southern will come very soon!)
The window opened with the hover gives the priority (from 0: very interesting to 3: poor interest) according to ARAS eruptive stars program.
It is of course partially subjective. Do not ...

The classical (eclipsing) symbiotic star V1413 Aql is in outburst: V = 10.4 on 05-05-2025

AAVSO B and V bands:

AAVSO_BV.png

The star is well placed for a monitoring of the decline of the outburst, until the next eclipse.

Spectrum secured in 2020 by Pavol Dubovsky during the last outburst ...

A new tool for observers:

List of symbiotic stars with the last observations from AAVSO database (V., Visible)

I hope it will help

https://aras-database.github.io/databas ... SySts.html

To do : add graphs

François Teyssier

Etienne,

Je vais sortir les transcriptions en français et en anglais

François

Pour ceux qui ne connaissent pas, un outil trés utile et convivial pour programmer ses observations:
airmass.org

A good spectrum, Robin

ATels:
An interesting one: https://www.astronomerstelegram.org/?read=17030
Showing a new increase of the activity od the system in January

ATel #17041 https://www.astronomerstelegram.org/?read=17041 quoted by Robin
is really problematic
The authors do not refer to previous ...

The RNAAS about the flare detected in November 2024:
T CrB: Detection of a Short Flare in 2024 November
(F. Teyssier, S. N. Shore, F. Sims, R. Leadbeater, J. Guarro Flo, K. Shank, E. Bertrand, and J. R. Foster)

A new flare is decribed in https://www.astronomerstelegram.org/?read=17030
It is ...

A research note about the 2024 November flare is under publication.

David Cujedo obtained a spectrum showing that the system is in a new excited state, with He II, He I.
The observation confirms that short ionized stages could be frequent but not detected due to the cadence of the monitoring ...

Excellent.
A lot of parameters are still unknown for this star.
A continuous monitoring (at least 1 spectrum by month) is suggested on at least an orbital period (unknown, probably 400 as an order or magnitude)