A&A 457, 619-622 (2006)
DOI: 10.1051/0004-6361:20065419

The proper motion of the isolated neutron star RX J1605.3+3249

S. Zane¹, A. De Luca², R. P. Mignani¹ and R. Turolla<sup>3

1</sup>  Mullard Space Science Laboratory, Holmbury St. Mary, Dorking - Surrey, RH5 6NT, UK
    e-mail: [sz;rm]@mssl.ucl.ac.uk
²  Istituto di Astrofisica Spaziale e Fisica Cosmica, via Bassini 15, 20133 Milan, Italy
    e-mail: deluca@iasf-milano.inaf.it
³  Universitá di Padova, Dipartimento di Fisica, via Marzolo 8, 35131 Padova, Italy
    e-mail: roberto.turolla@pd.infn.it

(Received 12 April 2006 / Accepted 29 June 2006 )

Abstract
Aims.We present a new optical observation of the X-ray dim isolated neutron star RX J1605.3+3249, performed in 2005 with the Wide Field Channel (WFC) of the Advanced Camera for Surveys (ACS) on board Hubble Space Telescope, aimed at measuring the neutron star proper motion.
Methods.We have compared the target position with the one measured in a previous HST image of the field obtained in 2001.
Results.We infer a proper motion of   3.1 mas/yr, corresponding to a star velocity  km s^-1 at 100 pc distance. Our measurement refines the result recently reported by Motch et al. (2005, A&A, 429, 257), and confirms the optical source as the counterpart of the neutron star.

Key words: stars: neutron -- ultraviolet: stars

© ESO 2006

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