[vsnet-chat 5589] Re: [AAVSO-DIS] Re: V 4742 Sgr

["Stan Walker" <astroman@xtra.co.nz>]

Brian and Arne,

Thanks for the comments. I'll wait until I've made some changes to the
filter equipment (adding the I filter and a clear filter for monitoring CVs
without needing to change the focus) before doing any more calibration
checks. I'll also contact Doug directly. SRs are interesting stars but best
left to the visual people. I'll sort out a sequence here from what I've
measured.

Regards,
Stan


----- Original Message -----
From: "Brian Skiff" <Brian.Skiff@lowell.edu>
To: <DWest61506@aol.com>
Cc: <aavso-discussion@informer2.cis.McMaster.CA>;
<vsnet-chat@ooruri.kusastro.kyoto-u.ac.jp>
Sent: Monday, October 21, 2002 8:15 AM
Subject: [vsnet-chat 5584] Re: [AAVSO-DIS] Re: V 4742 Sgr


> >>  Any guesses on the type of variable star?  Maybe a Mira or SRB??
>
>      Probably not a Mira, since usually the large amplitudes involved
> would mean it would have already been discovered.  Probably a
garden-variety
> semiregular, amplitude likely to be something like half a magnitude with
> a cycle-length of 3 or 4 months.
>
> >>  ...our differences in V magnitudes are due to different comparison
stars and
> >>  their assigned magnitudes.
>
>      Could be that or the extent to which both of you can calibrate your
> color terms for such a red star.  You both might do well to hit a couple
> of the "very red" stars from that list I prepared as well as more ordinary
> Landolt and Cousins E-region standards.
>
> http://ftp.lowell.edu/pub/bas/starcats/ubvri.red
>
>
> \Brian

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