| Issue |
A&A
Volume 504, Number 1, September II 2009
|
|
|---|---|---|
| Page(s) | 181 - 184 | |
| Section | Stellar structure and evolution | |
| DOI | https://doi.org/10.1051/0004-6361/200911944 | |
| Published online | 09 July 2009 | |
A low luminosity state in the massive X-ray binary SAX J0635+0533
INAF, Istituto di Astrofisica Spaziale e Fisica Cosmica Milano, via E. Bassini 15, 20133 Milano, Italy e-mail: sandro@iasf-milano.inaf.it
Received:
25
February
2009
Accepted:
2
June
2009
The X-ray pulsar SAX J0635+0533 was repeatedly observed with
the XMM-Newton satellite in 2003–2004. The precise localization
provided by these observations confirms the association of SAX J0635+0533 with a Be star. The source was found, for the first time, in a
low-intensity state, a factor ~30 lower than that seen in
all previous observations. The spectrum, well fitted by an
absorbed power law with photon index ~1.7 and 
cm-2, was compatible with that of the
high state. The low flux did not allow the detection of the
pulsations at 33.8 ms seen in BeppoSAX and RXTE data. In view of the
low luminosity observed in 2003–2004, we reconsider the
peculiarities of this source in both the accretion and
rotation-powered scenarios.
Key words: X-rays: individuals: SAX J0635+0533 / X-rays: binaries
© ESO, 2009
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