U-band and U-B

From: Ariel Goobar (ariel@physto.se)
Date: Fri Apr 11 2003 - 08:06:14 PDT

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    Hi,
    some brief update on the U-band lightcurve template. Vallery has
    now looked at the Jha U-data and fitted it with the Rob's template
    and it looks very good, except for epochs earleir than -7. In fact,
    the fitted magnitudes with his "best" U-template (based on Jha only) is
    totally consistent with what he gets with Rob's template. Stretch U and
    B are consistent, i.e. it seems that Rob is doing the right thing!

    As for my comments in yesterday's telecon:
    it turned out that it wasn't Rob's template that was used in
    an earlier comparison (it was Peter's!), which showed systematic
    deviations.

    Serena has started to look at the U-B intrinsic color dispersion
    in the Jha data, but the host galaxy reddening corrections are still not
    worked out. Without correcting for that (nor stretch) she is finding a
    scatter at maximum of 0.18 mag.

    Bon week-end,
                  Ariel 

    -- 
___________________________________________________________________
Ariel Goobar (www.physto.se/~ariel)
Department of Physics, Stockholm University
AlbaNova University Center, SE-106 91 Stockholm, SWEDEN
tel: +46 8 55378659 fax: +46 8 55378601

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