SN 1972E Ia in NGC 5253

OBJ:  SN 1972E Ia in NGC 5253 (S? according to Leda) which in 
         Leda is 
         Leda:  NGC 5253.
DISCOVERY:  1972may? UT by Kowal (1972). 
MAX:  1972may11.5 (JD 2441449) in B according to a private communication long ago from Bruno Leibundgut.
           I've used Bruno's old value, but {krisciunas2000} give JD 2441447.5 +/- 1.0.
           Darn. 
           Since the observations began post-Bmax, this is somewhat uncertain.
           See the US Navy Observatory 
           Julian Date Converter.
           Sometimes USNO is unavailable:  try 
           OnlineConversion.com:  Julian Converter
           which is a modified version of USNO.
           This day 132 of the year recalling that 1972 was
           a leap year.
SUPERNOVA of the YEAR:  M = 5.
           Those were the good old days when there were only 10 to 20 SNe per year and we never
           ran out of the alphabet. 

COMMENT:   This is a core normal SN Ia I guess. 
    

         Spectrum               Date                  Phase relative to Bmax    Observed Wavelength Range
         kirshner1973b          1972may15.5             4.                      3247.06--10644.78
         kirshner1973b          1972may16.5             5.                      3290.231--10659.75741
         kirshner1973b          1972may17.5             6.                      3282.95--10616.63
         kirshner1973b          1972may20.5             9.                      3281.47--10686.21
         kirshner1973b          1972may22.5            11.                      3402.255--9994.62 
         kirshner1973b          1972may23.5            12.                      3423.316--10011.3086
         kirshner1973b          1972may27.5            16.                      6070.831--9981.905 
         kirshner1973b          1972may31.5            20.                      3306.50--10565.328
         kirshner1973b          1972jun03.5            23.                      3401.008--9947.868
         kirshner1973b          1972jun06.5            26.                      3301.75--10785.15
         kirshner1973b          1972jul30.5            80.                      3636.34000--10718.6220

REF:
       CfA List of Supernovae
       where SN 1972E is noted.

       CfA Supernova Archive
       This has 0 SN 1972E spectra.  How could Bob Kirshner forget his early achievements.

       \citet{conley2006} General value
         of 19.4 days for Ia rise time in B.

       \citet{kirshner1973a} They
       give early photometry and narrow band photometry that approximates spectra. 

       \citet{kirshner1973b} They 
       give spectra from day +4 to day +235 relative to B max. 

       \citet{kirshner1975} They 
       give spectra from day +235 to day +714 relative to B max. 

       \citet{krisciunas2000} They
       give a new B maximum which is probably better than the old Bruno one. 

       SUSPECT Index.

       SUSPECT Index:  SN 1972E Ia.
       There are 0 SN 1972E spectra.  But there is a good picture of 
       Fritz Zwicky (Wikipedia).


HEADER: Header Common header information for this supernovae.
        The common header may (or may not) be updated relative to the header information above
        (D. J. Jeffery (2007jan01)).

REP:  F_lambda (erg/cm2/s/A) vs. lambda (ang)  (iformat = 1)
COR:  not deredshifted (heliocentric velocity 409 +/- 2 km/s from  
         Leda:  NGC 5253
      not dereddened (Galactic foreground 0.24/4=.06 reddening from  
         Leda:  NGC 5253
        but derived from
     Schlegel et al. (1998)
      not smoothed ????, not photometric ????
      Derived bolometric maximum is ??? (see above).
OBS: One of
     {kirshner1973b}
     {kirshner1975}
     But I seem to have scarfed all these SN 1972E spectra from Mark Philips's 
     anonymous ftp pub site when I was just poking around looking for goodies.
     That must have been about 1997sep07:  at least that is the date on the files.
     I think Mark must have just scanned them from {kirshner1973b} and {kirshner1975}.
     They arn't at the
     CfA Supernova Archive,
     and so Bob Kirshner may have lost track of his versions. 
     That was 1997sep07 or so when I was in Oak Ridge, Tennessee.


Date: 1972 with 1972may11.5 (JD 2441449) for B maximum gives:
      day =  - 2441449 = 



&specnamelist
   aname='sn1972e Ia 1972_05_'
   ebv=.06         ! 
   epoch=          ! This parameter needs to updated for the particular spectrum.
   idifmake=0
   iformat=1       ! Not deredshifted as far as I know, but that's not very far.
   ismooth=0
   itick=2
   itickln=4
   t_rise=19.4d0   ! \citep{conley2006}, Just an average rise time. 
   v_helio=409.
   ymin2=.3d-13
   ymax2=3.d-12
   ymin3=.3
   ymax3=3.
   wlammin1=
   wlammax1=
   wlammin2=
   wlammax2=
   wlammin3=
   wlammax3=
/




      

Postscript plot of the spectrum.




      

Postscript plot of the spectrum with local normalization.



Information from somewhere: