SN 1994I Ic in M51 (NGC 5194, the Whirlpool Galaxy, Sbc)

OBJ:  SN 1994I Ic in M51 (NGC 5194, the Whirlpool Galaxy, Sbc).  See 
          Leda:  M51.
DISCOVERY:  1994apr02.17 UT by Puckett & Armstrong {sasaki1994} 
MAX:  1994apr10  UT in some band (probably B or V) from {clocchiatti1996}. 
           This day of the year 100.
SUPERNOVA of the YEAR:  9.

HEADER:  D. J. Jeffery (2006jan01).

REF:
       {clocchiatti1996}
\bibitem[Clocchiatti et al.(1996)]{clocchiatti1996}
        Clocchiatti, A., Wheeler, J. C., Brotherton, M. S., Cochran, A. L.,
       Wills, D., Barker, E. S., \&~Turatto, M. 1996, \apj, 462, 462
%
        % ADS Reference
        % SN 1994I: Disentangling He i Lines in Type IC Supernovae.
        % We present spectroscopic observations of the Type Ic supernova SN 1994I
        % and analyze the evidence for helium in the optical portion of the spectrum.
        % The development of high-velocity He I {lambda}5876 starting approximately
        % 1 week after maximum light provides a pattern of evolution that can be used
        % to discriminate He I lines in other Type Ic supernovae. We show that,
        % contrary to earlier interpretation, SN 1987M displayed He I lines. The He
        % abundance is, however, probably consistent with previously derived upper
        % limits. We also identify He in SN 1988L. We conclude that most, and probably
        % all, Type Ic supernovae show evidence for He I lines in the optical
        % region of the spectra, which implies small amounts of high-velocity
        % helium in the outer portions of the ejecta. The implications of this
        % result for the progenitor stars are discussed.
        % Maximum light on April 10 in some band which the authors choose not to disclose.

     {iwamoto1994}
\bibitem[Iwamoto et al.(1994)]{iwamoto1994}
    Iwamoto, K., Nomoto, K., H\"oflich, P., Yamaoka, H., Kumagai, S., \&~Shigeyama, T.  1994, \apj, 437, L115 

% ADS reference.
     % Theoretical light curves for the type IC supernova SN 1994I (in M51).
     % They don't give the dates of maxima! 

     {sasaki1994}
\bibitem[Sasaki et al.(1994)]{sasaki1994}
    Sasaki, M., Kosugi, G., Ishigaki, T., Maemura, H., Aoki, K., \& Ohtani, H.  1994, PASJ, 46, L187 

% ADS reference.
     % Optical spectra of the supernova 1994I in M51 around the maximum light phase.
     % They say V maximum is around April 9.


REP:  F_lambda (erg/cm2/s/A) ??? vs. lambda (ang)  (iformat = 1)
COR:  not deredshifted ??? (heliocentric velocity 463 +/- 3 and 
        v_hel corrected for CMB radiation 640 km/s from
Leda:  M51
      not dereddened ??? (Galactic foreground .15/4... =.0375
     Schlegel et al. (1998)
      not smoothed ????, not photometric ????
      Derived maximum in some band is 2002apr10 (see above).

OBS:  ????

Date: 1994 () with 1994apr10 (100) for B maximum gives:
      day =  - 100 =  



&specnamelist
   aname='sn1994I Ic 1994_'
   ebv=.0375
   epoch=          ! This parameter needs to updated for the particular spectrum.
   iformat=1
   itick=2
   itickln=4
   t_rise=20.d0      ! default 
   v_helio=463.
   ymin2=1.d-17
   ymax2=1.d-12
   ymin3=.3
   ymax3=3.
   wlammin1=3800.d0
   wlammax1=
   wlammin2=3800.d0
   wlammax2=
   wlammin3=3800.d0
   wlammax3=
/




      

Postscript plot of the spectrum.




      

Postscript plot of the spectrum with local normalization.




Information from somewhere. 


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