[vsnet-alert 7031] Re: More on IM Nor

[Hitoshi YAMAOKA <yamaoka@rc.kyushu-u.ac.jp>]

Re: More on IM Nor

>   I have just confirmed the field on available materials.  It is now
>clear that both candidates in Wyckoff and Wehinger (1979) PASP 91, 173
>and in Duerbeck (1987) Space Sci. Rev. 45, 1 are incorrect quiescent
>counterparts.  It seems most likely the eastern component (the brightest
>of the three) of the successive three stars drawn just north of the stars
>a and b in Wyckoff and Wehinger (1979) is the correct quiescent counterpart.

  Though Wyckoff and Wehinger (1979) draw this star as the brightest
of the three, it is somewhat dimmer than other two on DSS2 R or I
images.  This figure is based on the TV viewing of the AAT, which is
presumably near to the B band.  It is quite agreeable that the
precurser is blueish object.  Indeed, it appears the brightest of
three on DSS1 Bj image taken on 1975 July 7.

  On the other DSS1 Bj image taken on 1987 Apr. 25, this star is less
impressive than other two.  It might be possible that this object is
variable at the quiescent, like as CI Aql (eclipsing binary).

  On DSS2 R image, it appears at the same brightness as other stars
having USNO-A2.0 rmag \sim 17.0 around it.  On DSS1 Bj 1975 image,
USNO-A2.0 bmag \sim 18.0.  

Sincerely Yours,
Hitoshi Yamaoka, Kyushu Univ., Japan
yamaoka@rc.kyushu-u.ac.jp

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