From: Vitaliy Fadeyev (VAFadeyev@lbl.gov)
Date: Thu Dec 16 2004 - 22:02:10 PST
Dear Serena,
thanks for your reply and considerations.
Regarding the TWiki registration, it would be best to concact
our administrator with a description of the problem. His address is
Vladimir Eberman <eberman@mh1.lbl.gov>.
For now, I just posted your email to the page
http://supernova.lbl.gov:8080/twiki/bin/view/Albinoni/EmailFromSerena
Hope this is ok.
In response to your questions I posted some text and plots to the
following link
http://supernova.lbl.gov:8080/twiki/bin/view/Albinoni/JhaSneTruncated
Cheers,
vitaliy
Serena Nobili wrote:
>Dear Vitaliy,
>
>as you know I am also working on my own on this issue and I can probably
>help in messing up even more this complicated topic. I want to stress,
>however, once again I am using the *real* data to compute the colours and
>not the results of a lightcurve fit (the same as in Nobili et al 2003), as
>I believe is the case of all the plots you put in the wiki. Moreover, I
>am fitting a linear relation of colours with the B-band stretch. My
>finding, however, is similar to yours:
>
> (U-B)_tBmax = -0.47 for s(B)=1
>
>The attached plot shows the result of my fit in a time bin of -1<t<1 days.
>The fit is actually done on the whole time and stretch together,
>e.g. without binning the data. The plot has been made only for comparison
>with yours. Also, as I said above, the points plotted are the real data,
>only for SN which were observed both in U and B at the same epoch (the two
>points at the same stretch value are the same SN observed twice in this
>time interval).
>
>I have some questions and comments about your plots, in particular U-B vs
>S(U). First, the exponential function you fit on the plot is mainly
>determined by the point at very low stretch (s ~ 0.6) which I believe is
>sn1997cn. Is this correct? If you take that point away, a linear relation
>would work quite well to fit the data. I am personally not including this
>SN in the analysis, also due to the difference of 0.15 mag , also
>discussed by Jha in the thesis, with the U-band published by Turatto et
>al. for the same SN.
>
>On the same line, there is another object, SN1997bp, whose U-band was
>published by Altavilla et al 2004 (same group as Turatto), for which the
>discrepancy with Jha is ~0.2-0.3 mag. So, it might be dangerous to include
>this SN in your fit. Other 2 SNe, SN1997br and SN1999aa, also observed in
>U-band by Altavilla et al. are quite in agreement with Jha's
>measurements.
>
>I hope I helped the discussion.
>Cheers,
>
> Serena
>
>PS. I apology for sending the file instead of adding it in the TWiki
>page. I tried to register, but it does not like my name so I was unable to
>do so (although I did use SerenaNobili). Can someone help me with that?
>
>
>On Wed, 15 Dec 2004, Vitaliy Fadeyev wrote:
>
>
>
>>Dear SCPers,
>>
>>the following TWiki page describes a color treatment for Albinoni analysis.
>>Since the topic is relevant for other on-going analyses, and also
>>because there
>>is a difference with the color assumed in Knop 03 paper, we call your
>>attention
>>to the issue, and solicit feedback.
>>
>>Direct link to TWiki page:
>>http://supernova.lbl.gov:8080/twiki/bin/view/Albinoni/ANoteOnColor
>>
>>Instruction on how to access the SCP TWiki are here:
>>http://supernova.lbl.gov/collab/
>>
>>Cheers,
>>vitaliy
>>
>>
>>
>>
>>
>>
>>
>
>
>
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