Ax Per Temperature estimation
Posted: Sun Nov 02, 2014 7:01 pm
Hello all,
My purpose is to get temperature of the Ax Per hot component.
So i start from Ax Per spectrum
Then i substract the continuum
I found the colour exces E(B-V) = 0.27
http://www.astronomie-amateur.fr/feuill ... AXPer.html
I could deredden the spectrum with the Isis dereddening tool
The i could measure relative flux of HeI HeII and Hbeta lines with Fityk.
HeI : 4471A -> 18.71
HeII : 4686A -> 206.55
Hbeta : 4861A -> 524.13
Temperature can be computed by the formulas found on François's web site
http://www.astronomie-amateur.fr/feuill ... Cyg_2.html
http://articles.adsabs.harvard.edu/full ... .116..210I Iijima, T. 1982 p 214
T [K] = 10000*(19.37 * racine(K) + 5.13)
with K = 2.22 * F(HeII 4686)/(4.16 * F(Hb 4861) + 9.94 * F(He I 4471))
I found the temperature value : 136567 K ~ 136600 K.
Do you think that the method and value are correct ?
Thanks a lot for your advices
Best regards,
My purpose is to get temperature of the Ax Per hot component.
So i start from Ax Per spectrum
Then i substract the continuum
I found the colour exces E(B-V) = 0.27
http://www.astronomie-amateur.fr/feuill ... AXPer.html
I could deredden the spectrum with the Isis dereddening tool
The i could measure relative flux of HeI HeII and Hbeta lines with Fityk.
HeI : 4471A -> 18.71
HeII : 4686A -> 206.55
Hbeta : 4861A -> 524.13
Temperature can be computed by the formulas found on François's web site
http://www.astronomie-amateur.fr/feuill ... Cyg_2.html
http://articles.adsabs.harvard.edu/full ... .116..210I Iijima, T. 1982 p 214
T [K] = 10000*(19.37 * racine(K) + 5.13)
with K = 2.22 * F(HeII 4686)/(4.16 * F(Hb 4861) + 9.94 * F(He I 4471))
I found the temperature value : 136567 K ~ 136600 K.
Do you think that the method and value are correct ?
Thanks a lot for your advices
Best regards,