EDP Sciences Journals List
Advanced Search
Subscriber Authentication Point
Home All issues Volume 434/3 Article
Free access article

Issue A&A
Volume 434, Number 3, May II 2005
Page(s) L9 - L12
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:200500103



A&A 434, L9-L12 (2005)
DOI: 10.1051/0004-6361:200500103

Letter

XMM-Newton observations of two transient millisecond X-ray pulsars in quiescence

S. Campana1, N. Ferrari1, 2, L. Stella3 and G. L. Israel3

1  INAF - Osservatorio Astronomico di Brera, via Bianchi 46, 23807 Merate (Lc), Italy
    e-mail: campana@merate.mi.astro.it
2  Università degli Studi di Milano, via Celoria 16, 20133 Milano, Italy
3  INAF - Osservatorio Astronomico di Roma, via Frascati 33, 00040 Monteporzio Catone (Roma), Italy

(Received 28 December 2004 / Accepted 22 March 2005 )

Abstract
We report on XMM-Newton observations of two X-ray transient millisecond pulsars (XRTMSPs). We detected XTE J0929-314 with an unabsorbed luminosity of ${\sim} 7\times 10^{31}\rm\ erg \; s^{-1}$ (0.5-10 keV) at a fiducial distance of 10 kpc. The quiescent spectrum is consistent with a simple power law spectrum. The upper limit on the flux from a cooling neutron star atmosphere is about $20\%$ of the total flux. XTE J1807-294 instead was not detected. We can put an upper limit on the source quiescent 0.5-10 keV unabsorbed luminosity ${\la} 4\times10^{31}\rm\ erg \; s^{-1}$ at 8 kpc. These observations strenghten the idea that XRTMSPs have quiescent luminosities significantly lower than classical neutron star transients.


Key words: accretion, accretion disks -- binaries: close -- stars: individual: XTE J0929-314, XTE J1807-294 -- stars: neutron

SIMBAD Objects



© ESO 2005


What is OpenURL?

The OpenURL standard is a protocol for transmission of metadata describing the resource that you wish to access. An OpenURL link contains article metadata and directs it to the OpenURL server of your choice. The OpenURL server can provide access to the resource and also offer complementary services (specific search engine, export of references...). The OpenURL link can be generated by different means.
  • If your librarian has set up your subscription with an OpenURL resolver, OpenURL links appear automatically on the abstract pages.
  • You can define your own OpenURL resolver with your EDPS Account. In this case your choice will be given priority over that of your library.
  • You can use an add-on for your browser (Firefox or I.E.) to display OpenURL links on a page (see http://www.openly.com/openurlref/). You should disable this module if you wish to use the OpenURL server that you or your library have defined.