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Letter to the Editor
A follow-up optical investigation of the binary pulsar PSR J1811-1736
Received 3 May 2000 / Accepted 15 May 2000
PSR J1811-1736 (P = 104 ms) is a binary pulsar in a highly eccentric orbit (= 18.8 d) around an unidentified companion. Here, an optical follow-up investigation of the pulsar field, performed using photographic plates from the UK-SERC Equatorial red survey, is reported. No object is detected at the pulsar position down to . At the pulsar distance of 6 kpc, this implies, for a likely value of (), an absolute magnitude for the companion star. Although the present upper limit is deep enough to rule out a red giant, it still leaves open the possibility of a main sequence star or a red dwarf companion. Deeper optical observations are thus required to investigate the presence of white dwarf or a neutron star.
Key words: stars: pulsars: individual: PSR J1811-1736 stars: binaries: general
© European Southern Observatory (ESO) 2000
Online publication: June 8, 2000