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VLBI astrometry of two millisecond pulsars

Published online by Cambridge University Press:  20 March 2013

Zhen Yan ,
Zhi-qiang Shen ,
Jian-ping Yuan ,
Na Wang ,
Helge Rottmann  and
Walter Alef
Zhen Yan
Affiliation:
Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China email: yanzhen@shao.ac.cn University of Chinese Academy of Sciences, Beijing 100039, China Key Laboratory of Radio Astronomy, Chinese Academy of Sciences, China
Zhi-qiang Shen
Affiliation:
Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China email: yanzhen@shao.ac.cn Key Laboratory of Radio Astronomy, Chinese Academy of Sciences, China
Jian-ping Yuan
Affiliation:
Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi 830011, China Key Laboratory of Radio Astronomy, Chinese Academy of Sciences, China
Na Wang
Affiliation:
Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi 830011, China Key Laboratory of Radio Astronomy, Chinese Academy of Sciences, China
Helge Rottmann
Affiliation:
Max Planck Institute for Radio Astronomy, Bonn 53121, Germany
Walter Alef
Affiliation:
Max Planck Institute for Radio Astronomy, Bonn 53121, Germany
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Abstract

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We present astrometric results on two millisecond pulsars, PSR B1257+12 and PSR J1022+1001, as carried out through VLBI. For PSR B1257+12, a model-independent distance of 710−38+43 pc and proper motion of (μα = 46.44 ± 0.08 mas/yr, μδ=−84.87 ± 0.32 mas/yr) were obtained from 5 epochs of VLBA and 4 epochs of EVN observations, spanning about 2 years. The two dimensional proper motion of PSR J1022+1001 (μα~−10.13 mas/yr, μδ~16.89 mas/yr) was also estimated, using 3 epochs of EVN observations. Based on our results, the X-ray efficiency of PSR B1257+12 should be in the same range as other millisecond pulsars, and not as low as previously thought.

Keywords

(stars:) pulsars: general
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S291: Neutron Stars and Pulsars: Challenges and Opportunities after 80 years , August 2012 , pp. 562 - 564
Copyright
Copyright © International Astronomical Union 2013

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