Volume 531, July 2011
|Number of page(s)||4|
|Section||Stellar structure and evolution|
|Published online||28 June 2011|
A search for radio pulsations from neutron star companions of four subdwarf B stars
Astronomical Institute “Anton Pannekoek”, University of Amsterdam, PO Box 94249, 1090 GE Amsterdam, The Netherlands
2 Stichting ASTRON, PO Box 2, 7990 AA Dwingeloo, The Netherlands
3 Dept. of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, B.C., V6T 1Z1, Canada
Received: 8 November 2010
Accepted: 29 May 2011
We searched for radio pulsations from the potential neutron star binary companions to subdwarf B stars HE 0532-4503, HE 0929-0424, TON S 183 and PG 1232-136. Optical spectroscopy of these subdwarfs has indicated they orbit a companion in the neutron star mass range. These companions are thought to play an important role in the poorly understood formation of subdwarf B stars. Using the Green Bank Telescope we searched down to mean flux densities as low as 0.2 mJy, but no pulsed emission was found. We discuss the implications for each system.
Key words: stars: neutron / pulsars: general / subdwarfs
© ESO, 2011
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