[vsnet-chat 3435] Re: Permanent Superhumpers...

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

Hi All,

For years we called these brighter outbursts supermaxima and it's hard to
change - the GCVS still uses that term. But I've always wondered why the SU
UMa group came to be called after that star when most of the original
research was done on VW Hydri and other southern stars. I remember looking
at superoutbursts of VW Hyi in 1972 and wondering why the periods at minimum
didn't match the periods in the superoutbursts. And we had superhumps on Z
Cha even earlier and didn't realise what these were. I note that apart from
S Dor and PK Tel stars almost every variable star type name after a star is
from a morthern or equatprial constellation. Such parochialism!

But on the topic of permanent superhumpers - if the superhumps are caused by
an eccentric disc why does this stay eccentric and keep precessing? I was
thinking about this a few days ago in respect of V803 Cen which seems to
have long-lasting humps which Joe Patterson associates with superhumps. I
think they were present in the data I got on July 9 but I haven't fully
checked this as yet.

Incidentally I like the idea of a separate area for sequences.

Regards,
Stan


----- Original Message -----
From: Taichi Kato <tkato@kusastro.kyoto-u.ac.jp>
To: <vsnet-chat@kusastro.kyoto-u.ac.jp>
Sent: Thursday, July 13, 2000 1:31 PM
Subject: [vsnet-chat 3424] Re: Permanent Superhumpers...


> Re: [vsnet-chat 3422] Re: Permanent Superhumpers...
>
>     Stan is probably right in the origin of the term "superhump", then
what
> about "superoutburst" or "SU UMa-type" ?  Because of the presence of
> the northern protype, some of these terms may have been US coined.
>
>     Regarding "permanent superhumpers", I thought that the term was first
> used by Y. Osaki in his dwarf nova unification theory.  [Am I correct?]
> By the way, "permanet superhumpers" are often abbreviated as "PS", just
> as SU for SU UMa stars.  Some people is called to have invented a new
> interpretation of PS as "permanent student", from an analogy that CV
> represents curriculum vitae.
>
> Regards,
> Taichi Kato
>
>

VSNET Home Page

Return to Daisaku Nogami

---

vsnet-adm@kusastro.kyoto-u.ac.jp