[vsnet-chat 312] Re: The star with the largest angular diameter

[munari@astras.pd.astro.it (FAX +39 424 600023, TEL. 600033)]

Quoted diameter for R Dor is quite big, however it may not be a true record.
With M.Lattanzi (Torino) and P.A.Whitelock and M.W.Feast (Cape Town) we 
have used HST to measure in interferometric mode with the onboard FGS the 
diameters of two O-rich Miras, R Leo and W Hya. At visual wavelengths
(objects like these present a strong dependence of diameter on lambda)
the two stars present marked elipticity and mean diameters of 74 mas (+/-2)
and 84 mas (+/-2). Details and analysis in coming ApJ august I issue.

Regards.   
          Ulisse Munari, Padova-Asiago Observatories

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