AstroBin saves small pieces of text information (cookies) on your device in order to deliver better content and for statistical purposes. You can disable the usage of cookies by changing the settings of your browser. By browsing AstroBin without changing the browser settings, you grant us permission to store that information on your device.
I agreeImaging telescope or lens:SkyWatcher Newton 150-750
Imaging camera:Atik 314L+
Mount:Sky-Watcher HEQ5
Guiding telescope or lens:SkyWatcher Newton 150-750
Guiding camera:ZWO Optical ASI120MM
Software:Astrobodger Bass v1.8.2
Filter:Shelyak Instruments Alpy 600
Resolution: 1400x500
Dates:Aug. 12, 2016
Frames: 15x120"
Integration: 0.5 hours
Avg. Moon age: 8.95 days
Avg. Moon phase: 66.40%
Astrometry.net job: 1320394
Locations: OHP, Observatoire de Haute Provence, Haute Provence, France
Encore une Wolf Rayet à la collection...
J'adore les WR.. bref..
Donc voici un spectre d'une étoile massive, chaude, lumineuse sur le point de finir en supernova..
Le système de classification de Smith (1968) nous donne :
C II λ4267, C III λ5696, C III/C IV λ4650, C IV λλ5801–12, and
O V λλ5572–98.
--> Type WC
C III > CIV
C II 4267, absent or weak, O V weak
--> Type WC 8
En conséquence de quoi la température de l'étoile est estimée à 70 000 K
Les mesures de FWHM sur les raies C III et C IV donnent ici des vitesses de vent stellaire de 1393 à 1900 Km/s
Comme d'habitude avec les WR c'est violent, rapide et les pertes de masse sont colossales.
L'utilisation d'un modèle , le PoWr (Postdam Wolf Rayet Model)
permet d'affiner la température à 63 000 K,
Un rayon de 3,6 rayons solaires
Une masse de 11 masses solaires.
La correspondance du spectre synthétique avec le spectre observé étant la seule méthode pour obtenir ces paramètres.
Voir :
The Galactic WC stars
Stellar parameters from spectral analyses indicate a new evolutionary
sequence .A. Sander, W.-R. Hamann, and H. Todt . https://arxiv.org/abs/1201.6354
Et
The PoWr model may be used from : http://www.astro.physik.uni-potsdam.de/~wrh/PoWR/powrgrid1.html
____________________________________________________________________________________________
This is star WR 135 spectra, a hot massive star.
Classification , according to the Smith system
C II λ4267, C III λ5696, C III/C IV λ4650, C IV λλ5801–12, and
O V λλ5572–98.
--> Type WC
C III > CIV
C II 4267, absent or weak, O V weak
--> Type WC 8
Then star (surface) temperature is between 60 to 70 000 K
The stellar wind speed from C III and C IV FWHM line measurements give speeds from 1300 to 1900 km/s.
Using the PoWr stellar model (Postdam Wolf Rayet model), gives :
Mass = 11 sun
Radius = 3,66 sun
Further details on this WR 135 spectra may be found in :
The Galactic WC stars
Stellar parameters from spectral analyses indicate a new evolutionary
sequence .A. Sander, W.-R. Hamann, and H. Todt . https://arxiv.org/abs/1201.6354
The PoWr model may be used from : http://www.astro.physik.uni-potsdam.de/~wrh/PoWR/powrgrid1.html
You have no new notifications. |
This page or operation is not available at the moment, because AstroBin is in READ ONLY mode. For more information, please check out our Twitter feed: https://twitter.com/AstroBin_com
If this image is the result of your processing of a public data pool, you can send it the pool so it's displayed there.
Use this form to select an existing public data pool.
If this image is the result of your processing of a private shared folder, you can send it the folder so it's displayed there.
Such limitation improves the website as a whole by discouraging people from creating fake accounts to like their own images. Thank you for understanding!
Currently, your AstroBin index is 0.00.
Comments