EDP Sciences
Free Access
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


A&A 431, 667-672 (2005)
DOI: 10.1051/0004-6361:20041665

X-ray properties of the transient pulsar 3A 0535+262 in quiescence

U. Mukherjee and B. Paul

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)

Abstract
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 $\times$ 10 33 erg s -1, indicating a very low rate of accretion. We report the detection of pulsations at a very low luminosity of 2 $\times$ 10 33 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

SIMBAD Objects



© ESO 2005

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.