[vsnet-chat 3850] Re: NSV4721 Vel - A Large Amplitude Semi Regular Variable

["Peter F Williams" <pfwilliams@onaustralia.com.au>]

Hi Brian,

The prospect of mode switching did come to mind and is mentioned in the
paper soon to be submitted to the VSS RASNZ, though I do not pretend to
understand such things.  Tim Bedding of the University of Sydney has an
interest in stars which show similar behaviour, such as R Doradus (Bedding,
T.R. et al.: 1998, MNRAS, 301, 1073).  A copy of my data was sent to him
about two weeks ago for running through his wavelet software but I have not
heard back yet.  Tim did mention the need for more frequent observations so
that may answer the question.

Stan Walker has also offered to search the data for periods and a copy of
the data has also been sent to him.

NSV4721 certainly appears to deserve more attention.

Tks and Regards

Peter Williams

----------
From: Brian Skiff <bas@lowell.edu>
To: pfwilliams@onaustralia.com.au
Cc: vsnet-chat@kusastro.kyoto-u.ac.jp
Subject: [vsnet-chat 3843] Re: NSV4721 Vel - A Large Amplitude Semi Regular
Variable
Date: Monday, December 04, 2000 7:36

     I wonder whether you have enough data to show that this could be an
overtone pulsator or that the star does some sort of mode-switching between
longer and shorter periods.  The varying amplitudes/cycle-lengths certainly
indicate more than one period is present.

\Brian

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