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What can VLBI astrometry tell us about AR Sco?

Published online by Cambridge University Press:  08 August 2017

Lang Cui ,
Jun Yang ,
Hongli Ma ,
Jun Liu  and
Wen Chen
Lang Cui*
Affiliation:
Xinjiang Astronomical Observatory, Chinese Academy of Sciences, 150 Science 1-Street, Urumqi, 830011, China Key Laboratory of Radio Astronomy, Chinese Academy of Sciences, 150 Science 1-Street, Urumqi, 830011, China
Jun Yang
Affiliation:
Onsala Space Observatory, Chalmers University of Technology, SE-439 92 Onsala, Sweden email: [email protected]
Hongli Ma
Affiliation:
Xinjiang Astronomical Observatory, Chinese Academy of Sciences, 150 Science 1-Street, Urumqi, 830011, China
Jun Liu
Affiliation:
Xinjiang Astronomical Observatory, Chinese Academy of Sciences, 150 Science 1-Street, Urumqi, 830011, China Key Laboratory of Radio Astronomy, Chinese Academy of Sciences, 150 Science 1-Street, Urumqi, 830011, China
Wen Chen
Affiliation:
Yunnan Observatories, Chinese Academy of Sciences, P.O. Box 110, Kunming 650011, Yunnan, China email: [email protected]
*
email: [email protected]
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Abstract

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We proposed to carry out high precision very long baseline interferometry (VLBI) observations of AR Sco, a pulsing white dwarf (WD) - M dwarf (MD) binary, to provide a direct distance measurement with the e-EVN (European VLBI Network) at 5 GHz. By the proposed parallax measurement on AR Sco, not only the precise distance will be determined, but also some physical parameters, such as the luminosity, the mass and the magnetic field will be significantly tightened accordingly, even the gravitational wave amplitude from this unique binary system can be tightly constrained. In addition, the EVN observations will allow us to answer that whether there is an extended emission structure associated with AR Sco, which will help us to explain the stable continuum radio emission observed during the pulse-off state.

Keywords

VLBIAR ScoBinary
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S323: Planetary Nebulae: Multi-Wavelength Probes of Stellar and Galactic Evolution , October 2016 , pp. 376 - 377
Copyright
Copyright © International Astronomical Union 2017 

References

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