| Issue |
A&A
Volume 431, Number 2, February IV 2005
|
|
|---|---|---|
| Page(s) | 667 - 672 | |
| Section | Stellar structure and evolution | |
| DOI | https://doi.org/10.1051/0004-6361:20041665 | |
| Published online | 04 February 2005 | |
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
Received:
15
July
2004
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
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