期刊
ASTRONOMY & ASTROPHYSICS
卷 408, 期 1, 页码 323-330出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20030802
关键词
stars : newton; X-rays : individual : RX J0720.4-3125
ESO 4 m class telescope and VLT deep imaging of the isolated neutron star RXJ0720.4 - 3125 reveals a proper motion of mu = 97 +/- 12 mas/yr and a blue U - B color index. We show that a neutron star atmosphere model modified to account for a limited amount of hydrogen on the star's surface can well represent both the optical and X-ray data without invoking any additional thermal component. The large proper motion almost completely excludes the possibility that accretion from the interstellar medium is the powering mechanism of the X-ray emission. It also implies that the proposed spin down is entirely due to magnetic dipole losses. RXJ0720.4 - 3125 is thus very likely a middle aged cooling neutron star. Its overall properties are quite similar to some of the long period radio pulsars recently discovered, giving further support to the idea that RXJ0720.4 - 3125 may be a pulsar whose narrow radio beam does not cross the Earth.
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