On the visual binary Upsilon Carinae

MANDRINI, C.H.; NIEMELA, V.S.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY

WILEY-BLACKWELL PUBLISHING, INC

Lugar: Londres; Año: 1986 vol. 223 p. 79 - 85

0035-8711

A spectral- and radial-velocity study of the components of the close visual binary system upsilo Carinae is presented. The data show that the fainter star of this system is an early B star of spectral type B3 - 4 IV, and that both components are located at a common distance of 400 pc, having a common age of 1.2×107yr. Slightly different radial-velocity values are determined for the members of the system, indicating an eccentric orbit. The authors also find evidence that the supergiant A8 Ib component has an outward expanding atmosphere.