[vsnet-alert 8943] QX Nor optical outburst (ATEL)
Taichi Kato
tkato at kusastro.kyoto-u.ac.jp
Tue Jul 11 10:12:25 JST 2006
According to ATEL, the X-ray nova QX Nor is undergoing an optical
outburst.
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The Astronomer's Telegram http://www.astronomerstelegram.org
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Posted: Sun Jul 9 01:30:01 EDT 2006 -- Mon Jul 10 01:30:01 EDT 2006
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ATEL #855 ATEL #855
Title: optical outburst of 4u 1608-522 (=QX Nor)
Author: Charles D Bailyn (Yale)
Queries: charles.bailyn at yale.edu
Posted: 9 Jul 2006; 16:04 UT
Subjects: Optical, Binaries, Neutron Stars, Transients
SMARTS consortium observations with the 1.3m telescope at CTIO + ANDICAM
instrument show that QX Normae, the optical counterpart of 4U 1608-522,
is in outburst (see Markwardt et al. ATEL 851 for a description of the
current high energy outburst). We obtained a 12m I-band image starting
at UT=2:01 July 9 2006 that showed the optical counterpart to be comparable
in magnitude to comparison star #7 (I=18.7) from Wachter 1997 (ApJ 485,
839). Precise measurements were hard to obtain from this image due to
bad conditions and scattered light, but QX Nor is clearly well above
its quiescent brightness of I>21 (Wachter et al. 2002 568, 901), and
within the range of the "Low Intensity State" described by Wachter et
al.
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