Volume 440, Number 1, September II 2005
|Page(s)||287 - 293|
|Section||Stellar structure and evolution|
|Published online||19 August 2005|
On the nature of two low- X-ray bursters: 1RXS J170854.4–321857 and 1RXS J171824.2–402934
SRON National Institute for Space Research, Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands
2 Astronomical Institute, Utrecht University, PO Box 80000, 3508 TA Utrecht, The Netherlands
3 Department of Physics and Astronomy, University of Southampton, Hampshire SO17 1BJ, UK
Accepted: 10 May 2005
We carried out Chandra observations of two low-luminosity low-mass X-ray binaries, 1RXS J170854.4–321857 and 1RXS J171824.2–402934, for which previously single X-ray bursts were detected with the Wide Field Cameras (WFCs) on board BeppoSAX. Both were detected in our Chandra observations in an actively accreting state three to eight years after the X-ray bursts, with 0.5–10 keV luminosities between and erg s-1. The apparently persistent nature is remarkable for 1RXS J171824.2–402934 given its low luminosity of 10-3 LEdd. The persistence of both sources also distinguishes them from 5 other low-L bursters, which have also been seen during bursts with the WFCs but were not detected during Chandra observations above a luminosity of 1033 erg s-1. Those are probably transient rather than persistent sources.
Key words: X-rays: binaries / X-rays: bursts / X-rays: individual: 1RXS J170854.4–321857 = 4U 1705–32 = 1M 1704–321 = 1H 1659–317; 1RXS J171824.2–402934 = RX J1718.4–4029
© 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.