SN 1998aq Ia in NGC 3982

OBJECT:  SN 1998aq Ia in NGC 3982 (SABb galaxy) which in Leda is
         NGC 3982.  
DISCOVERY:  1998apr13 UT by Hurst et al. 
MAXIMUM:  1998apr27.35 (JD 2450930.85 +/- 0.10) in B (riess2005, p. 602).
          See the US Navy Observatory Julian Date Converter.
          This day of the year 117.
SUPERNOVA of the YEAR:  M = 43.

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 (2006jan01)).


COMMENTS:  This is a core normal (CN) SN Ia.


REFERENCES:

       branch2003b Specifically on SN 1998aq.

       CfA List of Supernovae
       where SN 1998aq is noted.

       CfA Supernova Archive
       This has 29 SN 1998aq spectra and riess2005 photometry.
       These must be the ones reported in branch2003b and they must 
       be the same ones as on SUSPECT, but with different wavelengths.  Which is better?
       Probably both sets are equally good.  The finer wavelengths on SUSPECT may have no
       extra information in them.  But I wish someone would give a definitive good representation.

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

       riess2005 On SN 1998aq photometry.

       SUSPECT Index.

       SUSPECT Index:  SN 1998aq Ia.
       There are 11 SN 1998aq spectra.

CORRECTIONS:  Heliocentric velocity 1146 +/- 26 km/s (2007jul11) from
              Leda.
              Galactic foreground reddening 0.06/4=.015 reddening from
              Leda.
              This dervied derived from
              Schlegel et al. (1998)

OBSERVATIONS:  From
               1) SUSPECT:  but these spectra are probably all in the CfA supernova archive. 
               2) CfA supernova archive.
               3) David Branch /home/branch/synow/98aq:  These seem to be all CfA supernova 
                  archive spectra
               4) Eddie Baron:  no 98aq spectra.

SPECTRUM LOG:

     JD times for the SN 1998aq spectra of branch2003b.
     Bmax from riess2005 1998apr27.35 (JD 2450930.85 +/- 0.10).

     The branch2003b spectra from SUSPECT all not deredshifted?

     JD Bmax   Heliocentric velocity (Leda, 2007jul01)
     0930.85   1146
 
 
     Heliocentric velocity     Z redshift
           1146.0000000000   0.0038226445
 
     Index     JD of some kind Observer phase     Rest phase
 
         1      921.7800000000  -9.0700000000  -9.0354606458     ! branch2003b  1998apr18.28  3720--7418.25
         2      922.7600000000  -8.0900000000  -8.0591925716     ! branch2003b  1998apr19.26  3499.5--7139.25
         3      930.7900000000  -0.0600000000  -0.0597715147     ! branch2003b  1998apr27.29  3720--7499.25
         4      937.7600000000   6.9100000000   6.8836861149     ! branch2003b  1998may04.26  3720--7511.25
         5      951.7000000000  20.8500000000  20.7706013743     ! branch2003b  1998may18.20  3720--7539.75
         6     1021.6700000000  90.8200000000  90.4741494873     ! branch2003b  1998jul27.17  3720--7539.75

&specnamelist
   aname='sn1998aq Ia 1998_04_'
   ebv=.015         ! 
   epoch=          ! This parameter needs to updated for the particular spectrum.
   idifmake=0
   iformat=1      
   ismooth=0
   itick=2
   itickln=4
   t_rise=19.4d0   ! conley2006:  just an average rise time. 
   v_helio=1146.
   ymin2=.1
   ymax2=100.
   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 and someone: