[vsnet-be 29] Re: [vsnet-chat 3481] Re: Delta Sco

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

Hi,

The present discussion on delta Scorpii as a Be or gamma Cas star prompts me
to ask about the latter. Quite a number of blue stars seem listed as gamma
Cas variables yet they don't do anything much. Some we've used as UBV
comparisons for decades without seeing any variation greater than 1%. Now
I'm not querying delta Sco - a good effort by Sebastian and my
congratulations - but I wonder how these others receive their
classifications. Is this from spectral measures, or what? And I wonder how
many blue stars are classed as low amplitude variables purely because of
poor extinction corrections or transformations to the standard UBV system.

Regards,
Stan

----- Original Message -----
From: Taichi Kato <tkato@kusastro.kyoto-u.ac.jp>
To: <vsnet-be@kusastro.kyoto-u.ac.jp>; <vsnet-chat@kusastro.kyoto-u.ac.jp>

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