[vsnet-chat 393] Re: re question for symbiotic star

["Giuseppe 'Pippo' Bianco, ASI/CGS, Matera, Italy" <bianco@asimt0.mt.asi.it>]

Fraser Farrell wrote:
> 
> G'day all,
> 
>    >Symbiotic stars must not be binary systems. Even nowadays some
>    >astronomers still insist their single star models, e.g. a red type
>    >giant with very strong stellar corona, or a planetary nebula now is
>    >born from a red giant. But today we know that most (I want to say
>    >"all") of the symbiotic stars are binary systems consisting of a
>    >red giant and a hot component, the latter could be a main-sequence
> 
> I am confused.  Are they binary or not?
> 
> cheers,
> Fraser Farrell
> 
> http://vsnet.dove.net.au/~fraserf/   email: fraserf@dove.net.au
> traditional: PO Box 332, Christies Beach, SA  5165, Australia

Hello all

the term "symbiotic" by itself implies a close interactions between
different individuals. 
So the definition of a symbiotic "star" implies the concept of a binary
system with mass exchange between the components.
Some stars with extended gas envelopes may mimic some features of a
symbiotic system, but not all of them (double continuum, for example).

Best regards

Giuseppe Bianco

-- 
****************************************
Dr. Giuseppe Bianco
Agenzia Spaziale Italiana
Centro di Geodesia Spaziale "G. Colombo"
75100 Matera (MT), Italy
phone: +39-835-377209
fax:   +39-835-339005
e-mail: bianco@asimt0.mt.asi.it
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