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- W3103034188 abstract "We have used a set of dedicated astrometric data from the Hubble Space Telescope to measure the parallax and proper motion of the nearby neutron star RX J0720.4-3125. At each of eight epochs over 2 years, we used the High Resolution Camera of the Advanced Camera for Surveys to measure the position of the B = 26.6 target to a precision of ~2 mas (~0.07 pixels) relative to 22 other stars. From these data we measure a parallax of π = 2.8 ± 0.9 mas (for a distance of 360 pc) and a proper motion of μ = 107.8 ± 1.2 mas yr-1. Exhaustive testing of every stage of our analysis suggests that it is robust, with a maximum systematic uncertainty on the parallax of 0.4 mas. The distance is compatible with earlier estimates made from scaling the optical emission of RX J0720.4-3125 relative to the even closer neutron star RX J1856.5-3754. The distance and proper motion imply a transverse velocity of 180 km s-1, comparable to velocities observed for radio pulsars. The speed and direction suggest an origin for RX J0720.4-3125 in the Trumpler 10 OB association ~0.7 Myr ago, with a possible range of 0.5-1.0 Myr given by the uncertainty in the distance." @default.
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- W3103034188 date "2007-05-10" @default.
- W3103034188 modified "2023-10-18" @default.
- W3103034188 title "The Distance to the Isolated Neutron Star RX J0720.4−3125" @default.
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- W3103034188 doi "https://doi.org/10.1086/513309" @default.
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