MG13 - Talk detail |
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Participant |
Desvignes, Gregory | |||||||
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Institution |
Max-Planck-Institut für Radioastronomie - Auf dem Hügel 69 - Bonn - -Select- - Germany | |||||||
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Session |
EG3 |
Accepted |
Yes |
Order |
3 |
Time |
15:10 - 15:40 | |
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Talk |
Oral abstract |
Title |
Geometry and beam model of the binary pulsar J1906+0746 from measurement of relativistic spin precession | |||||
| Co-authors | Michael Kramer, Ismael Cognard, Andrew Lyne, Ben Stappers, Gilles Theureau | |||||||
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Abstract |
PSR J1906+0746 is a young relativistic pulsar (discovered by the Pulsar-ALFA survey in 2005) in a 4-hr orbit around a massive white dwarf or neutron star. Here we report the measurement of relativistic spin precession, an effect known to occur when the pulsar spin axis is misaligned with respect to the orbital angular momentum vector, that makes our line of sight cut different part of the radio beam. Using observations from the Nancay Radio Telescope from mid-2005 to early-2009, we detected severe pulse profile variations. Modeling the polarimetric data to the Rotating Vector Model (RVM), we determined the geometry of the system and found that our line of sight is indeed moving away from the pulsar's magnetic pole. A global RVM fit for all epochs allowed us to measure the misalignment along with the precession phase. Fitting the pulse profiles to the derived geometry, we constructed a tentative model for the beam shape. |
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