A&A 408, 689-692 (2003)
A WN4 companion to BD +62°2296 in Cas OB5I. Negueruela1, 2
1 Dpto. de Física, Ing. de Sistemas y Teoría de la Señal, Universidad de Alicante, Apdo. 99, 03080 Alicante, Spain
2 Observatoire de Strasbourg, 11 rue de l'Université, 67000 Strasbourg, France
(Received 19 March 2003 / Accepted 7 July 2003)
I report observations of the triple system showing that all its components are early-type stars, most likely physically related. The faintest component is a hitherto uncatalogued Wolf-Rayet star. The brightest component, star A, is shown to be a seemingly normal B2.5Ia supergiant. Long-slit spectroscopy of BD +62°2296B shows it to be a narrow-lined WN4 star. Given the spatial separation, the two objects are unlikely to form a physical binary. Spectra of the third visual component, BD +62°2296C , allow its classification as a B0III star. Such concentration of massive stars strongly suggests that BD +62°2296 is in reality a very compact young open cluster in the area of the OB association Cas OB5.
Key words: stars: early-type -- stars: distances -- stars: Wolf-Rayet -- stars: individual: BD +62°2296 -- stars: binaries: close -- stars: binaries: spectroscopic
© ESO 2003