[vsnet-chat 3466] Re: peculiar variable(?) from MACHO survey

[Seiichi Yoshida <comet@aerith.net>]

Dear colleagues,

> Subject: [vsnet-chat 3454] peculiar variable(?) from MACHO survey

>    According to recent AASVO discussion message, Doug Welch and Geoff
> Clayton reports an interesting variable, linearly declining from V=15.1
> (JD 2449800) to V=16.9 (JD 2451400), which may resemble the late stage of
> a nova.  The object is not present in PSS 1.  Does anyone have photographs
> or images around this period?
> 
>    18h 01m 56s.3  (J2000.0)
>    -27o 22' 56"
>          ?
>      15.1-16.9V

In the MISAO Project database, six unfiltered CCD images on three
nights (1999 Apr. 8, Sept. 23, 2000 Feb. 24) taken by KenIchi Kadota
contain this position. But it is just at the edge of the two on one
night (1999 Apr. 8). The thumbnail image on 1999 Sept. 23 and 2000
Feb. 24 is available at:

  http://vsnet.aerith.net/pub/MACHO_var.gif

No star brighter than 15 mag is found at the position. However, the
star about three pixels (about 20 arcsec) east of the position,
pointed by the triangular mark on the image above, may be fading on
this image. So I wonder the star is that pointed by the MACHO team.

Please note that the star is too faint to say it is variable or not on
the Kadota's images. But I can say that the MACHO variable star is not 
a red variable star, if so, it must be bright enough to be found on
the Kadota's unfiltered CCD images.

Best regards,

--
Seiichi Yoshida
comet@aerith.net
http://vsnet.aerith.net/

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