E(B-V) vs stretch

From: Greg Aldering (aldering@panisse.lbl.gov)
Date: Fri May 16 2003 - 13:20:04 PDT

  • Next message: Robert A. Knop Jr.: "Re: E(B-V) vs stretch"

    Hi Rob,

    Ok, grabbed b-v_snelist.lis from your webpage, and plotted the
    residuals (which I assumed were in the last column) vs stretch for SNe
    within 3 stretch-corrected days of max. What I see is that the
    residuals of the ridgeline of points misses zero by about 0.02-0.03 mag.
    There may be some higher-order effect as well, but that is harder
    to say with confidence.

    It appears that your fitting technique is not really finding the
    ridgeline. Your plot "Without omitted" in the B-V entry seems to show
    this effect, and suggests that you are fitting a bit too blue. I guess
    this might to be the old problem that you had before, in that if you
    fit redder, the Hamuy SNe come out too blue.

    If you don't get to it first, I'll try to plot-up the colors for the E/S0
    hosted SNe.

    - Greg

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