Journal Article

Near-infrared/optical identification of five low-luminosity X-ray pulsators*

Ramanpreet Kaur, Rudy Wijnands, Biswajit Paul, Alessandro Patruno and Nathalie Degenaar

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 402, issue 4, pages 2388-2396
Published in print March 2010 | ISSN: 0035-8711
Published online March 2010 | e-ISSN: 1365-2966 | DOI:
Near-infrared/optical identification of five low-luminosity X-ray pulsators*

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We present the identification of the most likely near-infrared (NIR)/optical counterparts of five low-luminosity X-ray pulsators (AX J1700.1−4157, AX J1740.1−2847, AX J1749.2−2725, AX J1820.5−1434 and AX J1832.3−0840) which have long pulse periods (>150 s). The X-ray properties of these systems suggest that they are likely members of persistent high-mass X-ray binaries or intermediate polars (IPs). Using our Chandra observations, we detected the most likely counterparts of three sources (excluding AX J1820.5−1434 and AX J1832.3−0840) in their European Southern Observatory-New Technology Telescope (ESO-NTT) NIR observations, and a possible counterpart for AX J1820.5−1434 and AX J1832.3−0840 in the Two Micron All Sky Survey and Digitized Sky Survey observations, respectively. We also performed the X-ray timing and spectral analysis for all the sources using our XMM–Newton observations, which further helped us to constrain the nature of these systems. Our multiwavelength observations suggest that AX J1749.2−2725 and AX J1820.5−1434 most likely harbour accreting neutron stars, while AX J1700.1−4157, AX J1740.1−2847 and AX J1832.3−0840 could be IPs.

Keywords: binaries: close; stars: neutron; novae, cataclysmic variables; pulsars: general; white dwarfs; X-rays: binaries

Journal Article.  5378 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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