Spectre de Sheliak 6 mai 2024 (Luc Caron)

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Spectre de Sheliak 6 mai 2024

Sheliak est une étoile double à éclipse semi-détachée, ce qui signifie qu'il y a échange de matière entre les deux étoiles qui gravitent l'une autour de l'autre. Cela donne un spectre très complexe avec de nombreuses raies d'émission pour les éléments tel que l'hydrogène et l'hélium I mais aussi pour l'azote II. Dépendamment du cycle de rotation on peut mesurer sur le spectre des effets doppler. Par exemple, la raie d'émission en Ha se dédouble lorsque les étoiles se déplacent à leur vitesse maximum par rapport à nous. Vous avez la région Ha et He 6678 sur la photo, sur cette portion du graphique on voit clairement le dédoublement de la raie He I. Pour celle de Ha on devine un léger épaulement de la raie d'émission. Ce qui indique que le 6 mai les étoiles n'étaient pas à leur vitesse maximale par rapport à nous. À suivre.

Sheliak is a semi-detached eclipsing double star, which means that there is an exchange of material between the two stars as they orbit each other. This gives a very complex spectrum with numerous emission lines for elements such as hydrogen and helium I but also for nitrogen II. Depending on the rotation cycle, Doppler effects can be measured on the spectrum. For example, the Ha emission line splits when stars move at their maximum speed relative to us. You have the Ha and He 6678 region on the photo, on this portion of the graph we can clearly see the splitting of the He I line. For that of Ha we can guess a slight shoulder of the emission line. Which indicates that on May 6 the stars were not at their maximum speed relative to us. To be continued.

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	Distinct awarded users	Total awarded images
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This table shows the distribution of awards per subject type, compared to the popularity of images of that subject type.
	Image of the day	Top pick	Top pick nominations	Total submitted
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	Image of the day	Top pick	Top pick nominations	Total submitted
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Amateur hosting facility
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Professional, scientific grade data
Mix of multiple sources
Other
Unknown

The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

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Views by Submitters (available since September 19th, 2023) Every image is assigned to 50% of available Submitters. In the event that at least 80% of them don't view the image before its time in the IOTD/TP process expires, it's assigned to the other 50% of Submitters and the process begins anew.
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Spectre de Sheliak 6 mai 2024

Spectre de Sheliak 6 mai 2024

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Image Index:

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Spectre de Sheliak 6 mai 2024

Spectre de Sheliak 6 mai 2024

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