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#TCrB

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Regarding T CrB, the star behaves in the same manner as in recent months. So we have no real clue when its outburst will happen.
These are my most recent photometric observations of this recurrent nova star (Fig. 1).

I am complementing my observations with a comparison of the spectra with data from AAVSO’s observer PROI (Fig. 2).

The blue spectrum corresponds to when T CrB was close to its peak brightness at the end of March. The red spectrum was captured three days ago, when this star seemed less bright.

Les raies d'émission dans le spectre de #TCrB sont de plus en plus marquées, indiquant une augmentation de l'accretion dans le disque qui entoure la naine blanche. Bientôt le grand soir ? Peut-être...

Actuellement invisible à l'oeil, cette étoile le deviendra mais restera faible lors de la nova.

Tautenburger Astronomen melden "signifikante Änderungen im Spektrum von #TCrB. Die Emissionslinien im Spektrum sind sprunghaft angestiegen, was auf eine stark erhöhte Akkretionsrate hindeutet. Des Weiteren sind nun Emissionslinien zu sehen, die nur bei einer Temperatur von mindestens 40000 K entstehen können. [...] Dies könnten erste Anzeichen sein, dass die Nova in Kürze ausbrechen wird": tls-tautenburg.de/de/news/taut -> facebook.com/Cunolanghaar/post und astronomerstelegram.org/?read=

Pre-Outburst Observations of #TCrB with a Smart Telescope: iopscience.iop.org/article/10. -> "From 2024 April 2 to November 7, we obtained, through two Seestar S50 smart-telescopes, 8060 unfiltered photometric points. It was thus possible to calculate the orbital period of the binary system found to be 226.1 ± 3.8 days, lower than the officially recognized 227.5687 ± 0.0099 days but within the error bar. No outbursts were observed during this observation period."

iopscience.iop.orgRadware Bot Manager Captcha

Le site spaceweather.com/ indique que la nova T CrB à actuellement une magnitude de 5,9. Cela pourrait vouloir dire que l'étoile commence une éruption. Le site de l'AAVSO montre toutefois que ce chiffre est basé sur une seule observation et en visuel donc le risque de fausse alerte est important. Les précédentes obs apparaissent avec une mag. normale mais datent de ~16h.

Si vous avez la possibilité c'est le bon moment pour vérifier (chez moi c'est ☁️☁️☁️).

spaceweather.comSpaceWeather.com -- News and information about meteor showers, solar flares, auroras, and near-Earth asteroids
Replied to Daniel Fischer

@cosmos4u Referring to the paper seems that researchers see #TCrB flickering more like a normal variation causing deviations when analyzing #TCrB light curves. Perhaps some findings can be found afterwards. Anyway, it's interesting to amateur to follow #TCrB flickering activity during ongoing pre-eruption stage and then after primary eruption during secondary- and post-eruption states.
Here enclosed is a fresh graph of my last night observations, several flicker activities is again visible.

Replied to Daniel Fischer

@cosmos4u
I have observed #TCrB around 30 nights during June&July each about 4 hours period with 22 second resolution. However, although there has been some possible findings of trends in my observations I have not actually analyzed those.
There are many research papers of these Cataclysmic Variables (CVs) published, and seems that in #TCrB there are brightness flickering even inside 1 minute. I have reported my observations to #AAVSO database, which researchers are using actively.