[vsnet-rvtau 82] (fwd) Re: [vsnet-campaign-rvtau 1] U Mon, interchange of primary minima

[Taichi Kato <tkato@kusastro.kyoto-u.ac.jp>]

From: "Stan Walker" <astroman@xtra.co.nz>
Date: Wed, 20 Mar 2002 15:49:26 +1200
Subject: [vsnet-chat 5253] Re: [vsnet-campaign-rvtau 1] U Mon, interchange of primary minima

Hi Sebastian,

A long time ago I did some UBV measures of U Mon. In this context we made
some measures of UW Centauri which behaves like an RV Tauri star at maximum
but often with an apparently triple maximum. It differs greatly from RY
Sagittarii which has a more regular single-peaked Cepheid-like pulsation at
maximum (although the rise and fall is rather symmetrical). In discussing
this with someone - Karen Pollard I think - the comment was made that RV
Tauri stars are fairly unstable and that the classical descriptions are
fairly imaginitive. So don't be surprised at erratic behabviour.

Regards,
Stan


----- Original Message -----
From: Sebastian Otero <varsao@fullzero.com.ar>
To: <vsnet-campaign-rvtau@kusastro.kyoto-u.ac.jp>; vsnet-chat
<vsnet-chat@kusastro.kyoto-u.ac.jp>; <vsnet-image@kusastro.kyoto-u.ac.jp>
Sent: Wednesday, March 20, 2002 3:11 PM
Subject: [vsnet-chat 5251] Re: [vsnet-campaign-rvtau 1] U Mon, interchange
of primary minima


>
> Subject: [vsnet-campaign-rvtau 1] U Mon, interchange of primary minima
>
> I have found that it happened three times between 2000 and 2002, but only
> this time I was able to record it and see both consecutive minima I.
> A lightcurve of the recent cycles and a detail of the times of minima at:
> http://ar.geocities.com/varsao/Curva_U_Mon.htm
>
> I want to ask you about this phenomenon:
> Does it happen only with minima I or is it possible that there are two
> consecutive minima II ?
> Why does it happen?
>
> Thanks.
>
> Regards,
> Sebastian.
>
>
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