spectro-aras.com

Peter, Robin, thank you for your interesting inputs. The subject is not easy. Pros and Cons. I raised the subject to Christopher Corbally ("Stellar Spectral Classification") Chris considers that HD 143807 should not be used as it is likely to be spectroscopically variable. Résumé of the di...

A great spectrum at Mag V ~ 10.6! The outburst is produced by an increase of the luminosity of the hot component (envelope of the white dwarf and/or accretion disk). The mechanism is not well known. At this state, it appears as a A-F giant/super-giant (to be precised by a detailed study of the absor...

Hi Rainer,

That's good!

Your spectra are welcome in the database if you want
(francoismathieu.teyssier at gmail.com)

All the best,
François

https://www.astronomerstelegram.org/?read=15528

AAVSO light curve :

Dear Rainer, Nice spectrum! Shepe of the spectrum and wavelength calib looks good. Id: you have also He II and He I. But you have very probably (almost certain) artifacts, for instance in the range 6000-6200. I would suggest you compare with a recent LISA Spectrum in the db: https://aras-database.gi...

T CrB belongs to the very small group of recurring novae (RN) and among them the symbiotic sub-group (SyRN). http://www.astronomie-amateur.fr/SymbioticStars/NovaeSymbiotiques.html Its first outburst was detected in 1866 during which Huggins obtained the first spectrum of a nova. The second outburst ...

Very interesting and accurate input from Jaroslav Merc. Once again, congratulations to Keith! And a thought: do not hesitate to dig in the symbiotic lists http://astronomy.science.upjs.sk/symbiotics/ and have a look to any MIII star in the sky. Surprises are possible! François Jaroslav Merc: There i...

Just accepted in MNRAS and published in arXiv https://ui.adsabs.harvard.edu/abs/2022arXiv220710473P/abstract BTW, the presentation of my talk at EAS 2022 annual meeting: http://www.astronomie-amateur.fr/Documents%20Symbiotic%20Stars/ROOM9_SS18b_1215_Teyssier.pdf And a publication (gamma-rays) in whi...

Remarquable!
Trés intéressant sujet qui ouvre de nouvelles perpectives, excellents résultats, belle page web, intructive et bien documentée.
Merci

François Teyssier

Our colleague Keith Shank got a spectrum of StHA 154 and put the finger on an interesting behavior. StHA 154 = 2MASS J18432793+1930053 in SIMBAD is a poorly studied symbiotic star with 4 references in Simbad. Keith obtained a spectrum of a red giant, spectral type M7-8 (from TiO1 index) with no emis...