info:eu-repo/semantics/article
The runaway binary LP 400-22 is leaving the Galaxy
Fecha
2013-08Registro en:
Kilic, Mukremin; Gianninnas, A.; Brown, Warren R.; Harris, Hugh C.; Dahn, Conard C; et al.; The runaway binary LP 400-22 is leaving the Galaxy; Oxford University Press; Monthly Notices of the Royal Astronomical Society; 434; 4; 8-2013; 3582-3589
0035-8711
CONICET Digital
CONICET
Autor
Kilic, Mukremin
Gianninnas, A.
Brown, Warren R.
Harris, Hugh C.
Dahn, Conard C
Agüeros, M. A.
Heinke, Craig O.
Kenyon, S. J.
Panei, Jorge Alejandro
Camilo, Fernando
Resumen
We present optical spectroscopy, astrometry, radio and X-ray observations of the runaway binary LP 400-22. We refine the orbital parameters of the system based on our new radial velocity observations. Our parallax data indicate that LP 400-22 is significantly more distant (3σ lower limit of 840 pc) than initially predicted. LP 400-22 has a tangential velocity in excess of 830 km s-1; it is unbound to the Galaxy. Our radio and X-ray observations fail to detect a recycled millisecond pulsar companion, indicating that LP 400-22 is a double white dwarf system. This essentially rules out a supernova runaway ejection mechanism. Based on its orbit, a Galactic Centre origin is also unlikely. However, its orbit intersects the locations of several globular clusters; dynamical interactions between LP 400-22 and other binary stars or a central black hole in a dense cluster could explain the origin of this unusual binary.