SIMBAD references

2007ApJ...660.1428K - Astrophys. J., 660, 1428-1443 (2007/May-2)

The distance to the isolated neutron star RX J0720.4-3125.


Abstract (from CDS):

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+170–90pc) and a proper motion of µ=107.8±1.2 mas/yr. 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+90–40 km/s, 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.

Abstract Copyright:

Journal keyword(s): Astrometry - Stars: Individual: Alphanumeric: RX J0720.4-3125 - Stars: Neutron - X-rays: individual (RX J0720.4-3125)

VizieR on-line data: <Available at CDS (J/ApJ/660/1428): table4.dat table7.dat table9.dat>

Nomenclature: Table 2: [KVA2007] NNN (Nos 101-124).

Status at CDS : All or part of tables of objects will not be ingested in SIMBAD.

CDS comments: Table 2: Objects X, A, B = [KVA2007] 101, 102, 103.

Simbad objects: 10

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