Spectre HD127617 (Be star) (Luc Caron)

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Spectre HD127617 (Be star)

L'étoile qui m'intéressait le soir du 26 avril était HD 127617 (pas très loin d'Arcturus) puisqu'elle est de classe Be (B5e). On voit bien la raie d'émission en Ha. Cependant, tout près il y a une étoile de même intensité HD127667 (qui n'est pas liée à HD127617). Au spectroscope, pour un tel doublet, il n'est pas évident d'être sûr que c'est la bonne étoile qui est dans la fente. Alors, pour pas prendre de chance j'ai fait le spectre des deux. HD127667 est de classe F8 un spectre facile à identifier en raison de la présence de la G band et des raies du CA II. HD127667 est de couleur jaunâtre tandis que HD127617 est bleutée. Un beau doublet!

The star that interested me on the evening of April 26 was HD 127617 (not very far from Arcturus) since it is class Be (B5e). We can clearly see the emission line in Ha. However, nearby there is a star of the same intensity HD127667 (which is not related to HD127617). In the spectroscope, for such a doublet, it is not easy to be sure that it is the correct star which is in the slit. So, to avoid taking any chances, I made the spectrum of both. HD127667 is class F8, a spectrum easy to identify due to the presence of the G band and two CA II lines. HD127667 is yellowish while HD127617 is bluish. A beautiful doublet!

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