Is PSR B1931+24 the golden source for the accretion regimes testing?

Details Is PSR B1931+24 the golden source for the accretion regimes testing? Is PSR B1931+24 the golden source for the accretion regimes testing?

Sep 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005cxo..prop.2081r&link_type=abstract

Chandra Proposal ID #07408249

Astronomy and Astrophysics

Astronomy

Chandra Proposal Id #07408249

Scientific paper

Very recently the discovery of an intermittent radio pulsar was reported on Science (Kramer et al.2006,astro-ph/0604605). PSR B1931+24 has the surprising peculiarity of being a 813ms radio-pulsar for ~5d and being radio quiet for the following 25-35d, periodically. The pulsar spin slows down 50% faster when the pulsar is on than when is off. The ~30d periodicity and the weird spin-down behaviour of this radio activity remind what is expected for a pulsar in a binary system spinning near the equilibrium period in an eccentric ~30d orbit: at the apastron the low wind accretion rate allows the radio pulsar regime, while at the periastron the neutron star is radio-quiet because accreting and emitting in the X-rays. This might be the linking object between the X-ray binaries and the radio pulsar binaries, a golden source for finally testing the accretion regimes.

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