Spectre de Bet2 Cygne ou Albiréo B (Luc Caron)

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Spectre de Bet2 Cygne ou Albiréo B

Link: https://groupecoamnd.wixsite.com/website

Spectre de Bet2 Cygne ou Albiréo B

Link: https://groupecoamnd.wixsite.com/website

J'ai été surpris d'apprendre que la composante bleue de la double visuelle Albiréo est une étoile de type Be. En fait, cette étoile tourne tellement vite sur elle-même qu'elle éjecte de la matière formant un anneau qui émet en Ha sur mon spectre. Avec une meilleure résolution on devrait voir deux pics d'émission permettant de calculer la vitesse de rotation de cet anneau. Toutefois, en agrandissant mon spectre (et de l'imagination ;-)), je distingue un léger épaulement vers 6561 A ce qui donnerait une vitesse de rotation d'environ 100 km/s.... La prochaine fois que vous observerez cette belle double pensez-y, la bleue émet en Ha.

I was surprised to learn that the blue component of the Albireo visual double is a Be-type star. In fact, this star spins so fast on itself that it ejects matter forming a ring which emits in Ha on my spectrum. With a better resolution we should see two emission peaks allowing to calculate the rotation speed of this ring. However, by enlarging my spectrum (and with faith ;-)), I can see a slight shoulder around 6561 A which would give a rotational speed of around 100 km/....The next time you will observe this beautiful double think about it, the blue emits in Ha.

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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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Spectre de Bet2 Cygne ou Albiréo B

Spectre de Bet2 Cygne ou Albiréo B

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