SN 1954a Ib in NGC 4214 (Irr)

OBJ:  SN 1954a Ib in NGC 4214 (Irr).  See
          Leda:   NGC 4214 (Irr).
DISCOVERY:  ?
MAX:  1954apr19 in pg from \citet{casebeer2000}.
           This day of the year 110.  Recall 1954 was a leap year.
SUPERNOVA of the YEAR:  1.  Those were the good old days
           when the 1st supernova of the year didn't happen until April.

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

REF:


       
\bibitem[Blaylock et al.(2000)]{blaylock2000}
        Blaylock, M., Branch, D., Casebeer, D., Milliard, J., Baron, E., Richardson, D., \&~ Acheta, C.
        2000, PASP, 112, 1439
%
        % ADS Reference
        % Mount Wilson and Palomar Photographic Supernova Spectra
        % This includes SN 1954A Ib.

       
\bibitem[Branch(1972)]{branch1972} Branch, D.  1972, A\&A, 16, 247
%
%       ADS reference
        %  The spectrum of the type I supernova of 1954 in NGC 4214.
        % David confirms He I lines in SN 1954A Ib.
        % McLaughlin identified them in 1963.

       
\bibitem[Casebeer et al.(2000)]{casebeer2000}
        Casebeer, D., Branch, D., Blaylock, M., Milliard, J., Baron, E., Richardson, D., \&~ Acheta, C.
        2000, PASP, 112, 1433
%
        % ADS Reference
        % Lick Observatory Photographic Supernova Spectra
        % This includes SN 1954A Ib with pg maximum estimated as 1954_04_19.


\bibitem[McLaughlin(1963)]{mclaughlin1963} McLaughlin, D. B.  1963, PASP, 75, 133
%
%       ADS reference
        %  The spectrum of the type I supernova of 1954 in NGC 4214.
        % McLaughlin identified them in 1963.
        % This is Dean B. McLaughlin:  a much older namesake of
        % unrelated astronomer Dean E. McLaughlin.



REP:  Flux in some weird sense vs. lambda (ang)  (iformat = 1)
COR:  deredshifted ??? (heliocentric velocity 292 +/- 2 and
        v_hel corrected for CMB radiation 549 km/s from
  Leda:   NGC 4214 (Irr).
      not dereddened (Galactic foreground .09/4... =.0225
     Schlegel et al. (1998)
      not smoothed, very not photometric,
        This are digitized microphotometer transmission tracings of photographic plates.
      Estimated pg maximum is 2002feb07 (see above).

OBS:  ????

This is a combined spectrum made up from  sn1954a_1954_06_06.b.html scaled up by 1.55/1.16 and
  sn1954a_1954_06_06.r.html.  The scaling was needed to not create an artificial line feature
  at the joining point which was 5200.4 A.  I used ./trans.f to do the scaling.

Date: 1954jun06 (158) with 1954apr19 (110) for pg maximum gives:
      day = 158 - 110 = 48



&specnamelist
   aname='sn1954ap Ib  1954_06_06'
   ebv=.0225
   epoch=  48        ! This parameter needs to updated for the particular spectrum.
   iformat=1
   itick=4
   itickln=4
   t_rise=20.d0      ! default
   v_helio=0.        ! 292 km/s, but I think these have already been dereddshifted.  It's pretty small in any case.
   ymin2=1.
   ymax2=2.
   ymin3=.85
   ymax3=1.15
   wlammin1=3355.9
   wlammax1=7096.865
   wlammin2=3355.9
   wlammax2=7096.865
   wlammin3=3750.
   wlammax3=6600.
   xx_cont=.075d0      ! The default value is .15d+0, but the microphotometer transmission tracings need something smaller.
/




      

Postscript plot of the spectrum.




      

Postscript plot of the spectrum with local normalization.



FITS: Fits format information from the compilers.

For the blue region.

SIMPLE = T
BITPIX = -32
NAXIS = 1
NAXIS1 = 2999
CRVAL1 = 3355.9
CDELT1 = 0.67
CTYPE1 = 'LINEAR '
OBJECT = '1954A '
SNTYPE = 'Ib '
TYPECITE= 'Blaylock et al. 2000'
MAXDATE = '1954-04-19'
MAXBAND = 'pg '
MAXCITE = 'Blaylock et al. 2000'
DATE-OBS= '1954-06-06'
HOSTGAL = 'NGC4214 '
HELVEL = 291.
HVELCITE= 'Blaylock et al. 2000'
OBSERVER= 'unknown '
OBSAFFIL= 'unknown '
END

For the red region.

SIMPLE = T
BITPIX = -32
NAXIS = 1
NAXIS1 = 4942
CRVAL1 = 4947.53
CDELT1 = 0.435
CTYPE1 = 'LINEAR '
OBJECT = '1954A '
SNTYPE = 'Ib '
TYPECITE= 'Blaylock et al. 2000'
MAXDATE = '1954-04-19'
MAXBAND = 'pg '
MAXCITE = 'Blaylock et al. 2000'
DATE-OBS= '1954-06-06'
HOSTGAL = 'NGC4214 '
HELVEL = 291.
HVELCITE= 'Blaylock et al. 2000'
OBSERVER= 'unknown '
OBSAFFIL= 'unknown '
END

END: