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Issue A&A
Volume 429, Number 3, January III 2005
Page(s) 999 - 1006
Section Stellar structure and evolution
DOI http://dx.doi.org/10.1051/0004-6361:20041442



A&A 429, 999-1006 (2005)
DOI: 10.1051/0004-6361:20041442

PSR B0809+74: Understanding its perplexing subpulse-separation (P $_\mathsf{2}$) variations

Joanna M. Rankin1, R. Ramachandran2 and Svetlana A. Suleymanova3, 4

1  Sterrenkundig Instituut "Anton Pannekoek", 1098 SJ Amsterdam, The Netherlands
    e-mail: jrankin@astro.uva.nl; joanna.rankin@uvm.edu
2  Department of Astronomy, University of California, Berkeley, CA 94720, USA
    e-mail: ramach@astron.berkeley.edu
3  Pushchino Radioastronomy Observatory of the Lebedev Physical Institute, 142290, Russia
    e-mail: suleym@prao.psn.ru
4  Isaac Newton Institute of Chile, Pushchino Branch

(Received 9 June 2004 / Accepted 28 August 2004)

Abstract
The longitude separation between adjacent drifting subpulses, P2, is roughly constant for many pulsars. It was then perplexing when pulsar B0809+74 was found to exhibit substantial variations in this measure, both with wavelength and with longitude position within the pulse window. We analyze these variations between 40 and 1400 MHz, and we show that they stem primarily from the incoherent superposition of the two orthogonal modes of polarization.


Key words: stars: pulsars: general -- polarisation -- radiation machanisms: non-thermal

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© ESO 2005


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