[vsnet-chat 3741] Re: Nightly averaged magnitude of Mira

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

Hi All,

I was interested in TK's data presentation for Mira. Obviously this is a
rather faint maximum - which tend to be a bit broader than the brighter
kind. The analysis tends to support my contention - if you're trying to
establish the epoch of maximum of a Mira star it's better to ignore the top
10% of the light curve and fit the remaining data to a standard light curve.
This way the optimists and the pessimists don't affect the conclusions too
much.

Perhaps Mira is not a good example. At this brightness level it is being
compared with B and A type stars in most cases and being a late rising
equatorial object extinction will make a difference of several tenths of a
magnitude to evening observations. It should be fainter in the morning when
it's closer to the meridian. I'm not sure about alpha Ceti - it's spectral
type suggests low amplitude variations but that shouldn't affect the present
measures. But to us southerners it's just another example of altitude making
the northern star appear brighter than its southern counterpart, beta, which
in reality is considerably brighter.

I'm almost tempted to make a visual measure myself. Tonight, perhaps, if the
present fine weather persists.

Regards,
Stan

----- Original Message -----
From: Taichi Kato <tkato@kusastro.kyoto-u.ac.jp>
To: <vsnet-chat@kusastro.kyoto-u.ac.jp>;
<vsnet-computing@kusastro.kyoto-u.ac.jp>; <vsnet-lpv@kusastro.kyoto-u.ac.jp>
Sent: Monday, October 23, 2000 5:23 AM
Subject: [vsnet-chat 3740] Nightly averaged magnitude of Mira

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