[vsnet-alert 7207] XTE J1650-500 large-amplitude oscillations

[Taichi Kato <tkato@kusastro.kyoto-u.ac.jp>]

XTE J1650-500 large-amplitude oscillations

   According to IAUC 7837, Tomsick et al. report that this blackhole candidate
X-ray transient is exhibiting large-amplitude variations with a period
of 13.5-14.0 d.  They suggested that the period may correspond to the
disk-precession as seen in HZ Her (Her X-1).  See IAUC 7837 for further
detailed information.  This finding may suggest the presence of superhump-type
variation (not necessarily close to 13.5-14.0 d, but likely much shorter)
in optical wavelangths.  Time-series observations are strong encouraged.
(cf. XTE J1118+480 = KV UMa, the best-observed example of superhumps and
precession in a blackhole transient).

   Position of the object:

   According to IAUC 7707, the following variable object (possible optical
counterpart) has been identified with the new X-ray transient (reported by
Castro-Tirado et al.).

   16h 50m 01s.0
   -49o 57' 45"
    (J2000.0, error=2")

   The preliminary magnitude is reported as B=17.  Given the likely large
interstellar reddening, the object could be observable with a CCD.

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