Journal
ASTRONOMY & ASTROPHYSICS
Volume 425, Issue 3, Pages L45-L48Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:200400062
Keywords
stars : individual : Atlas; stars : distances; stars : fundamental parameters; Galaxy : open clusters and associations : individual : Pleiades
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We present radial velocity and new interferometric measurements of the double star Atlas, which permit, with the addition of published interferometric data, to precisely derive the orbital parameters of the binary system and the masses of the components. The derived semi-major axis, compared with its measured angular size, allows to determine a distance to Atlas of 132+/-4 pc in a purely geometrical way. Under the assumption that the location of Atlas is representative of the average distance of the cluster, we confirm the distance value generally obtained through main sequence fitting, in contradiction with the early Hipparcos result (118.3+/-3.5 pc).
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