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BF Cygni : strong jets
Posted: Sat Jul 16, 2016 3:38 pm
by Francois Teyssier
Last spectrum of BF Cygni shows strong jets at +/- 300 km/s
- Hb_BFCyg.PNG (7.31 KiB) Viewed 10111 times
- Balmer_BFCyg.PNG (12.78 KiB) Viewed 10111 times
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
Re: BF Cygni : strong jets
Posted: Mon Jul 18, 2016 11:05 pm
by Paolo Berardi
François, thank you for the alert!
I observe yesterday this target. Full profile:
Heliocentric radial velocity of h-alpha line:
Paolo
Re: BF Cygni : strong jets
Posted: Tue Jul 19, 2016 9:12 pm
by Francois Teyssier
Nice, Paolo !
The satellite bumps are clearly seen at R = 5000
Here's a comparison (13 and 16th of July)
- _bfcyg_20160716_951_full_H alpha_1.png (13.52 KiB) Viewed 10053 times
- _bfcyg_20160716_951_full_H beta_1.png (13.69 KiB) Viewed 10054 times
Observation scheduled tonight
A high cadency coverage should be great
François
PS : 31°C in Normandy at Midnight ... CCD Cooler at 0°C
Re: BF Cygni : strong jets
Posted: Thu Jul 21, 2016 3:17 am
by Tim Lester
My latest spectra for July 20th at Hbeta (R = 6400) compared to my last result on May 23rd
- bfcyg_ 20160720_95_Hb_tlester.png (21.05 KiB) Viewed 10010 times
Tim
Re: BF Cygni : strong jets
Posted: Thu Jul 21, 2016 3:15 pm
by Joan Guarro Flo
Hi :
Vission of BF Cyg in low resolution.
Regards, Joan.
Re: BF Cygni : strong jets
Posted: Thu Jul 21, 2016 4:54 pm
by Francois Teyssier
Nice resolution, Joan !
Tim : very interesting. The outflows appears before June.
All the best,
François
Re: BF Cygni : strong jets
Posted: Sun Jul 24, 2016 6:12 pm
by Francisco Campos
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
- _bfcyg_20160723_923.png (11.91 KiB) Viewed 9974 times
Re: BF Cygni : strong jets
Posted: Mon Jul 25, 2016 4:59 pm
by Joan Guarro Flo
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.
Re: BF Cygni : strong jets
Posted: Fri Jul 29, 2016 2:43 pm
by Olivier GARDE
Re: BF Cygni : strong jets
Posted: Sun Jul 31, 2016 8:05 am
by Francois Teyssier
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
- Maxwell_40000.PNG (7.24 KiB) Viewed 9860 times
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)
- BFCyg_HeI_2015-04.PNG (15.09 KiB) Viewed 9860 times
Note Na I in faint emission and the complex shape of the absorption, combination of interstellar and symbiotic nebula
François
