[vsnet-alert 3672] XTE J1859+226 hump period

[Makoto Uemura <uemura@kusastro.kyoto-u.ac.jp>]

XTE J1859+226 hump period

We submit the following article to IAUC 7303.

>XTE J1859+226
>     M. Uemura and T. Kato, Kyoto University; and E. Pavlenko,  S.
>Shugarov, and M. Mitskevich, Crimean Astrophysical Observatory,
>communicate:  "CCD photometry of the optical counterpart of XTE
>J1859+226 (IAUC 7274, 7276) with the 0.25-m and 0.38-m telescopes
>at Kyoto and Crimea revealed likely orbital modulations with a
>period of 0.2806 day and an amplitude of 0.10 mag.  The variations
>were present on Oct. 20-26, and possibly on Oct. 17, which makes
>this the earliest detection of such signals among x-ray novae (cf.
>IAUC 5259, 5692)."

More observations are urged to clarify the nature of the optical 
counterpart of XTE J1859+226.

Regards, 
M. Uemura, T. Kato, E. Pavlenko, S.Shugarov, and M. Mitskevich,

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