SN 1991M Ia in IC1151 (SBc)

OBJECT:  SN 1991M Ia in IC1151 (SBc).  In Leda it is
         IC1151 (Leda).
DISCOVERY:  1991mar12 by Pennypaker et al. 
            CfA List of Supernovae
MAXIMUM:  1991mar17.3 (JD 2448332.8) in B just from subracting 2 days off of Vmax which was the old rule.
          1991mar19.3 (JD 2448334.8 +/- 2.0) in V (ford1993).  
          See the US Navy Observatory Julian Date Converter.
          This day of the year 78.
SUPERNOVA of the YEAR:  13.

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

COMMENTS:  A broad line (BL) SN Ia.

SPECTRUM LOG:

     JD times for the SN 1991M spectra of gomez1996

     Bmax 1991mar17.3 (JD 2448332.8) estimated from ford1993

     The spectra probably are all deredshifted since that was
     what gomez1996 tended to do.

     JD Bmax  Heliocentric velocity (Leda, 2007jul04)
     8332.8   2169.
 
 
     Heliocentric velocity     Z redshift
           2169.0000000000   0.0072350052
 
     Index     JD of some kind Observer phase     Rest phase
 
         1     8337.7400000000   4.9400000000   4.9045158025     ! gomez1996       1991mar22.24  3479.11--9739.735 (rest)
         2     8362.7200000000  29.9200000000  29.7050835652     ! gomez1996       1991apr16.22
         3     8415.0800000000  82.2800000000  81.6889798043     ! gomez1996       1991jun08.08  3585.37--9699.7795 (rest)


REFERENCES:

       CfA List of Supernovae
       where SN 1991M is noted. 

       CfA Supernova Archive
       For SN 1991M, this has 0 spectra and 0 photometry.

       conley2006 General value
       of 19.4 days for Ia rise time in B.

       ford1993 VRI photometry of SN 1991M
       with Vmax on JD 2448334.8 +/- 2 which is 1991mar19.3. 

       gomez1996 
       No discussion of 91M, but there is data in Table 1 for the 3 spectra with phases. 

       gomez1998 
       There are 4 spectra of 91M shown, but only one clearly from gomez1996.

       gomez1998b 
       Shows some of the ealier reported 91M spectra.

       paturel2003 (Leda) Leda refererence.

       SUSPECT Index.

       SUSPECT Index:  SN 1991M Ia.
       There are 3 SN 1991M spectra all from gomez1996. 

CORRECTIONS:  Heliocentric velocity 2169 +/- 3 km/s (2007jul04) from 
              IC1151 (Leda).
              Galactic foreground reddening .16/4=.04
              IC1151 (Leda).



COMMENTS:

OBSERVATIONS:  From (1)
               1) SUSPECT where the gomez1996 spectra are all that are available.

PHASE:

       For consistency we always use rest phase and for explicitness to more digits than are significant.

       observer phase =
       rest phase =
      

&specnamelist
   aname='sn1991m Ia 1991_03_'
   ebv=.04
   epoch=              ! This parameter needs to updated for the particular spectrum.
   idifmake=0
   iformat=-1          ! This has to be checked for every spectrum.   gomez1996 actually
                       !   do deredshift their spectra as I recall.
   ismooth=0    ! Smoothing?
   itick=2
   itickln=4
   t_rise=19.4d0       ! conley2006:  just an average rise time.
   v_helio=2169.
   ymin2=1.e-15
   ymax2=7.e-14
   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. 

FITS: Fits format information from the observers if there is any.

END: