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To: stefano@bicar.it
From: atel@astronomerstelegram.org
Subject: ATel  17204
Message-Id: <20250525070623.143222880792@server.astronomerstelegram.org>
Date: Sun, 25 May 2025 03:06:23 -0400 (EDT)

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Posted: Within the last 24 hours
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ATEL #17204							     ATEL #17204

Title:	Detection of mHZ QPOs in BeXRB pulsar XTE J0111.2-731 (SXP
		31.0) in SMC
Author:	Kinjal Roy (RRI), Rahul Sharma (IUCAA), Hemanth Manikantan
		(INAF), Biswajit Paul (RRI)
Queries:	kinjal@rrimail.rri.res.in
Posted:	24 May 2025; 09:53 UT
Subjects:X-ray, Binary, Neutron Star, Transient, Pulsar

The Be/X-ray Binary system XTE J0111.2-7317 or SXP 31.0 has been detected
by Swift (ATel: #17147) and SRG/ART-XC (ATel: #17163) during its latest
outburst. NuSTAR made a TOO observation of the source between 2nd and 3rd
May 2025 (MJD: 60797-60798). The source was detected with NuSTAR with a
count rate of about 7 counts/s in FPMA and FPMB modules. Assuming the distance
to the SMC to be 60 kpc, we estimated the luminosity of the source to be
2x10^38 erg/s in the 3-79 keV energy band. Pulsations were present in
the entire lightcurve with a period of about 30.4497(1) sec, consistent
with the ASCA observation of the 1998 outburst (Yokogawa et al. 2000).
A quasi-periodic oscillation (QPO) was discovered in the source at 1.27
Hz with RXTE/PCA data during the declining phase of the 1998 outburst (Kaur
et al. 2007).

In the current NuSTAR data, the 1.27 Hz QPO was not detected; instead,
a low-frequency QPO was detected at 0.8 +/- 0.1 mHz. The quasi-periodic
oscillation has a Q factor of about 2.7. The QPO was visible in the NuSTAR
light curve. The durations of successive QPO cycles showed gradual changes
and not a stochastic behavior, indicating some physical processes driving
the cycle durations.

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