Search found 1561 matches
- Thu Aug 04, 2022 9:13 am
- Forum: Novae
- Topic: Call for observations of the preoutburst phase of T CrB
- Replies: 17
- Views: 9083
Reference Star
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...
- Wed Aug 03, 2022 5:08 pm
- Forum: Symbiotic Stars
- Topic: V919 Sgr in outburst
- Replies: 11
- Views: 6840
Re: V919 Sgr in outburst
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...
- Tue Aug 02, 2022 7:24 am
- Forum: Novae
- Topic: Call for observations of the preoutburst phase of T CrB
- Replies: 17
- Views: 9083
Re: Call for observations of the preoutburst phase of T CrB
Hi Rainer,
That's good!
Your spectra are welcome in the database if you want
(francoismathieu.teyssier at gmail.com)
All the best,
François
That's good!
Your spectra are welcome in the database if you want
(francoismathieu.teyssier at gmail.com)
All the best,
François
- Tue Aug 02, 2022 6:48 am
- Forum: Symbiotic Stars
- Topic: V919 Sgr in outburst
- Replies: 11
- Views: 6840
- Mon Aug 01, 2022 8:07 am
- Forum: Novae
- Topic: Call for observations of the preoutburst phase of T CrB
- Replies: 17
- Views: 9083
Re: Call for observations of the preoutburst phase of T CrB
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...
- Sat Jul 23, 2022 6:01 pm
- Forum: Novae
- Topic: Call for observations of the preoutburst phase of T CrB
- Replies: 17
- Views: 9083
Call for observations of the preoutburst phase of T CrB
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 ...
- Fri Jul 22, 2022 3:55 pm
- Forum: Symbiotic Stars
- Topic: The case StHA 154
- Replies: 3
- Views: 3549
Re: The case StHA 154
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...
- Fri Jul 22, 2022 7:40 am
- Forum: Astrophysics, Theory, Publications ...
- Topic: RS Oph : New publication using asdb spectra
- Replies: 0
- Views: 3453
RS Oph : New publication using asdb spectra
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...
- Sat Jul 16, 2022 3:32 pm
- Forum: Spectra, results, information on activity ...
- Topic: Spectropolarimetry experience with a small refracor
- Replies: 2
- Views: 4131
Re: Spectropolarimetry experience with a small refracor
Remarquable!
Trés intéressant sujet qui ouvre de nouvelles perpectives, excellents résultats, belle page web, intructive et bien documentée.
Merci
François Teyssier
Trés intéressant sujet qui ouvre de nouvelles perpectives, excellents résultats, belle page web, intructive et bien documentée.
Merci
François Teyssier
- Sat Jul 16, 2022 3:21 pm
- Forum: Symbiotic Stars
- Topic: The case StHA 154
- Replies: 3
- Views: 3549
The case StHA 154
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...