[vsnet-chat 3791] Re: Delta Cep period analysis of visual observations

[aah@nofs.navy.mil]

  Delta Cep (HD213306) is on our parallax program; amazing to use
a 1.55-m telescope to look at such a bright star.  I think
we can probably extract a reasonable R-band photometric
light curve one of these days.
  However, Polaris (HD8890) really *is* too bright for us.
Don Fernie followed this star for a number of years after
it 'stopped pulsating'.  The last paper I saw from the
Toronto group (AJ 116, 936, 1998) indicated the pulsational
full amplitude was around V=0.03mag, with the period undergoing
some change from its original 3.97 days.
  The theory is that Polaris was originally a first overtone
pulsator, and is now evolving into a fundamental mode pulsator
and will end up with a period around 5.6 days.  It is an
interesting star that bears watching; ideal for the
'telephoto' CCD wide-angle systems.
Arne

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