[vsnet-chat 3037] RE: EsB 365 observations and comments

[Sebasti若n Otero <varsao@fullzero.com.ar>]

Hi, Stan and friends:
                                   As a southern observer the RCB star I
observe the most is V854 Cen and it displays this cepheid-like pulsation
clearly. The visual estimates I posted recently for the period 1998 - 2000
are in perfect agreement with the ephemeris and period proposed in Lawson
et. al, 1999. and show that the star is in the third pulsation cycle since
the last recovery. The star is very active so we have to observe it closely
if we want to catch the next decline from the beginning. Based on the 43.23
day period, the fading could begin at  2451723.43; 2451766.66, or could have
just begun at 2451680.2 . Last cycles I observed the star varying between
7.1 and 7.3 , so if the star gets fainter than 7.3 we should pay attention.
                                    This, again , is one of the reason I
don't think EsB 365 is an RCB star: the fluctuations seem to be completely
irregular.
Clear skies to all,
Sebasti睹.

From: William S G Walker <astroman@voyager.co.nz>
To: Sebasti睹 Otero <varsao@fullzero.com.ar>; Fraser Farrell
<fraserf@dove.net.au>
Cc: <vsnet-chat@kusastro.kyoto-u.ac.jp>
Sent: Wednesday, June 07, 2000 2:30 PM
Subject: [vsnet-chat 3033] Re: EsB 365 observations and comments


> Hi Sebastian and Fraser,
>
> I've been reading the comments on R CrBs over the past few weeks. We used
> to make UBV measures of these from Auckland, both to check the colours
> during the fades and the short term periodicities. The latter are
> interesting - stars such as RY Sagittarii have a fairly periodic
modulation
> similar to the longer period Cepheids such as l Carinae. Others, such as
UW
> Centauri have a much less regular period, very reminiscent of RV Tauri
> stars. I gather the latter can appear to have triple maxima at times - and
> UW Cen seems to mix double and treble maxima, at least when we were
> measuring in the 70s and 80s.
>
> Regards,
> Stan
>
> ----------
> > From: Sebasti睹 Otero <varsao@fullzero.com.ar>
> > To: Fraser Farrell <fraserf@dove.net.au>
> > Cc: vsnet-chat@kusastro.kyoto-u.ac.jp
> > Subject: [vsnet-chat 3030] RE: EsB 365 observations and comments
> > Date: Monday, June 05, 2000 12:24 PM
>

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