X-ray properties of the transient pulsar 3A 0535+262 in quiescence
Department of Astronomy and Astrophysics, Tata Institute of Fundamental Research, Homi Bhabha Road, 400 005 Colaba, Mumbai, India e-mail: [uddipan;bpaul]@tifr.res.in
Accepted: 27 October 2004
We present the timing and spectral properties of the transient Be/X-ray binary pulsar 3A 0535+262 during quiescence using three observations with the narrow field imaging instruments (NFI) of BeppoSAX. Assuming a distance of 2 kpc for this system, the 2–10 keV X-ray luminosities measured from the three observations are in the range of 1.5–4.0 1033 erg s-1, indicating a very low rate of accretion. We report the detection of pulsations at a very low luminosity of 2 1033 erg s-1 during one of the three observations, though at this accretion rate the system is expected to be in the centrifugally inhibited regime. The X-ray spectra for the unpulsed observations are best modeled as power law type while a combined model of power law and black-body is required to fit the pulsed spectrum.
Key words: stars: pulsars: individual: 3A 0535+262 / stars: neutron / stars: circumstellar matter / X-rays: general / X-rays: stars
© ESO, 2005