Volume 398, Number 3, February II 2003
|Page(s)||L25 - L28|
|Published online||28 January 2003|
Letter to the Editor
The origin of Scorpius X-1
Service d'Astrophysique / CEA-Saclay, 91191 Gif-sur-Yvette, France
2 Instituto de Astronomía y Física del Espacio/Conicet, Argentina
Corresponding author: I. F. Mirabel, email@example.com
Accepted: 1 December 2002
We have used multi-wavelength observations of high precision to derive the space velocity and compute the orbit around the Galactic Centre of the prototype X-ray binary Scorpius X-1. An origin in the local spiral arm of the Milky Way is ruled out. The galactocentric kinematics of Scorpius X-1 is similar to that of the most ancient stars and globular clusters of the inner Galactic halo. Most probably, this low-mass X-ray binary was formed by a close encounter in a globular cluster. However, it cannot be ruled out that a natal supernova explosion launched Scorpius X-1 into an orbit like this from a birth place in the galactic bulge. In any case, the Galactocentric orbit indicates that Scorpius X-1 was formed more than 30 Myrs ago.
Key words: stars: individual: Scorpius X-1 / X-rays: binaries / astrometry
© ESO, 2003
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