BF Cygni : strong jets
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BF Cygni : strong jets
Last spectrum of BF Cygni shows strong jets at +/- 300 km/s
About the discovery of jets in BF Cyg, see Augustin Skopal's publication :
http://adsabs.harvard.edu/abs/2013A%26A...551L..10S
Of course, a coverage of BF Cyg for the next weeks is recommended :
- high resolution
- low res, flux calibrated
François Teyssier
About the discovery of jets in BF Cyg, see Augustin Skopal's publication :
http://adsabs.harvard.edu/abs/2013A%26A...551L..10S
Of course, a coverage of BF Cyg for the next weeks is recommended :
- high resolution
- low res, flux calibrated
François Teyssier
François Teyssier
http://www.astronomie-amateur.fr
http://www.astronomie-amateur.fr
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Re: BF Cygni : strong jets
François, thank you for the alert!
I observe yesterday this target. Full profile:
Heliocentric radial velocity of h-alpha line:
Paolo
I observe yesterday this target. Full profile:
Heliocentric radial velocity of h-alpha line:
Paolo
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Re: BF Cygni : strong jets
Nice, Paolo !
The satellite bumps are clearly seen at R = 5000
Here's a comparison (13 and 16th of July) Observation scheduled tonight
A high cadency coverage should be great
François
PS : 31°C in Normandy at Midnight ... CCD Cooler at 0°C
The satellite bumps are clearly seen at R = 5000
Here's a comparison (13 and 16th of July) Observation scheduled tonight
A high cadency coverage should be great
François
PS : 31°C in Normandy at Midnight ... CCD Cooler at 0°C
François Teyssier
http://www.astronomie-amateur.fr
http://www.astronomie-amateur.fr
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Re: BF Cygni : strong jets
My latest spectra for July 20th at Hbeta (R = 6400) compared to my last result on May 23rd
Tim
Tim
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Re: BF Cygni : strong jets
Hi :
Vission of BF Cyg in low resolution.
Regards, Joan.
Vission of BF Cyg in low resolution.
Regards, Joan.
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Re: BF Cygni : strong jets
Nice resolution, Joan !
Tim : very interesting. The outflows appears before June.
All the best,
François
Tim : very interesting. The outflows appears before June.
All the best,
François
François Teyssier
http://www.astronomie-amateur.fr
http://www.astronomie-amateur.fr
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Re: BF Cygni : strong jets
Excel·lent resultat, Joan,
Here is my contribution from last night. Not as good as Joan's one, but I am happy with the result.
Greetings
Fran
Here is my contribution from last night. Not as good as Joan's one, but I am happy with the result.
Greetings
Fran
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Re: BF Cygni : strong jets
Moltes gràcies Fran:
You're getting all the juice to DADOS. You could indicate on the charts, the type of telescope, the number of integrations and the exposure time?
Amicalment, joan.
You're getting all the juice to DADOS. You could indicate on the charts, the type of telescope, the number of integrations and the exposure time?
Amicalment, joan.
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Re: BF Cygni : strong jets
Last night, I could take a spectrum of BF Cyg .
Emission lines of HeI have emerged since my last spectrum taken in September 2015
Emission lines of HeI have emerged since my last spectrum taken in September 2015
LHIRES III #5, LISA, e-Shel, C14, RC400 Astrosib, AP1600
http://o.garde.free.fr/astro/Spectro1/Bienvenue.html
http://o.garde.free.fr/astro/Spectro1/Bienvenue.html
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Re: BF Cygni : strong jets
Bien vu, Olivier
BF Cygni is a symbiotic of low excitation
The temperature of the hot component is 'only' 60 000 K at quiescence.
[OIII] and He II can be observed, faint
During a classical symbiotic outburst, the envelop of the hot star expands and cools
Here's the maxwellian distribution of energy for a temperture of, say, 40 000 K
according to the energy in eV
There's only a few photons emitted by the pseudophotosphere above 24.6 eV : He remains neutral, so no emission lines of He I (or very faint)
He I appears essentially in absorption, probing the strong (stratified) wind from the hot star (about 450 km/s)
Note Na I in faint emission and the complex shape of the absorption, combination of interstellar and symbiotic nebula
François
BF Cygni is a symbiotic of low excitation
The temperature of the hot component is 'only' 60 000 K at quiescence.
[OIII] and He II can be observed, faint
During a classical symbiotic outburst, the envelop of the hot star expands and cools
Here's the maxwellian distribution of energy for a temperture of, say, 40 000 K
according to the energy in eV
There's only a few photons emitted by the pseudophotosphere above 24.6 eV : He remains neutral, so no emission lines of He I (or very faint)
He I appears essentially in absorption, probing the strong (stratified) wind from the hot star (about 450 km/s)
Note Na I in faint emission and the complex shape of the absorption, combination of interstellar and symbiotic nebula
François
François Teyssier
http://www.astronomie-amateur.fr
http://www.astronomie-amateur.fr