[vsnet-chat 291] Re: CH Cyg

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

Gary Poyner wrote in [vsnet-chat 236]:

> Although the light variations of CH Cyg are well reported on VSNET, little
> is said about eclipses in this system.  As a visual observer I would be 
> very interested to know if anyone has observed these visually in the past,
> and our chances of monitoring them in the future!

    According to Hinkle et al. 1993 (AJ 105, 1074), the spectroscopic
conjunction of the suggested 756-day binary (inner binary) occurs

    JDconj = 2446643.655 + 756.0 * E

(red giant in front).

    The conjunction times correspond to the following epochs.

      JD
   24446644    1986 Jul. - Aug.
      47400    1988 Aug.
      48156    1990 Sep.
      48912    1992 Oct.
      49667    1994 Nov.
      50423    1996 Dec.

    Looking back through visual observations from the AFOEV and VSOLJ
records, I could only find possible hints of fadings in the latest two
moments.  CH Cyg showed a shallow minimum between 1994 Nov. and 1995
Jan.; in 1996 the star showed its historical minimum around July.  The
association of these visual fadings with eclipses still needs to be
verified.

Regards,
Taichi Kato

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