SN 1997cn Ia in NGC 5490
OBJECT: SN 1997cn Ia in NGC 5490 (E galaxy) which in
Leda is
NGC 5490 (Leda).
DISCOVERY: 1997may14.6 UT by Li et al. (1997)
MAXIMUM: Bmax 1997may15.4 UT (JD 2450583.9) (jha2006, p. 549).
1997may19.5 +/- 1 UT (JD 2450588) (turatto1998, p. 2434).
All the photometry was postmax and jha2006's was post-10-postmax and from after
about may27.
turatto1998 had some from earlier from may23.
If jha2006 was using all the data, I'd have to trust them.
But since they are only using their own and it starts a little later, it's
a toss-up.
To be consistent with David Branch, I'll stick with turatto1998.
See the US Navy Observatory
Julian Date Converter.
This day of the year 139.
SUPERNOVA of the YEAR: M = 92.
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)).
COMMENT: This an extreme cool SN Ia like SN 1991bg.
Spectrum Date Phase relative to Bmax Observed Wavelength Range
turatto1998 2002may22 2.6 3543.04--7411.4399514618
REFERENCES:
CfA List of Supernovae
where SN 1998cn is noted.
CfA Supernova Archive
For SN 1997cn, there are 0 spectra and some photometry in jha2006.
conley2006 General value
of 19.4 days for Ia rise time in B.
jha2006 Gives
SN 1997cn Bmax date of JD 2450583.9 and these guys are also light curve experts.
But their data is all well postmax.
paturel2003 (Leda) Leda refererence.
SUSPECT Index.
SUSPECT Index: SN 1997cn Ia.
There are 3 spectra from turatto1998.
turatto1998
Specifically on SN 1997cn.
CORRECTIONS: Heliocentric velocity 4855 +/- 24 km/s (2007jul17) from
NGC 5490 (Leda).
Galactic foreground reddening 0.12/4=.03 from
NGC 5490 (Leda).
This is derived from
Schlegel et al. (1998)
Note that turatto1998 assumed 0. reddening.
OBSERVATIONS: From (1).
1) SUSPECT: all turatto1998 spectra.
2) Eddie Baron: none.
3) David Branch /home/branch/synow/97cn: only the turatto1998 spectra from
SUSPECT.
SPECTRUM LOG:
JD times for the SN 1997cn spectra of turatto1998.
Bmax 1997may15.4 UT (JD 2450583.9) (jha2006, p. 549).
1997may19.5 +/- 1 UT (JD 2450588) (turatto1998, p. 2434).
Since turatto1998 have some earlier data and it is all postmax,
we will trust turatto1998 for now.
Are the turratto wavelengths are observed or rest?
Very, very few clues.
JD Bmax Heliocentric velocity (Leda, 2007jul01)
0588. 4855.
Heliocentric velocity Z redshift
4855.0000000000 0.0161945368
Index JD of some kind Observer phase Rest phase
1 590.6200000000 2.6200000000 2.5782464922 ! turatto1998 1997may22.12 3543.0400000000--7411.4399514618
2 614.8500000000 26.8500000000 26.4221062278 ! turatto1998 1997jun15.35
3 665.5200000000 77.5200000000 76.2846061370 ! turatto1998 1997aug05.02
&specnamelist
aname='sn1997cn Ia 1997_05_'
ebv=.03 !
epoch= ! This parameter needs to updated for the particular spectrum.
idifmake=0
iformat=1
ismooth=0 ! Smoothing?
itick=2
itickln=4
t_rise=19.4d0 ! conley2006: just an average rise time.
v_helio=4855.
ymin2=0.1d0
ymax2=1.d0
ymin3=.3
ymax3=3.
wlammin1=
wlammax1=
wlammin2=
wlammax2=
wlammin3=
wlammax3=
/
Postscript plot of the spectrum.
Note the G_END labels mark the good ends of the spectrum.
These are the places where local normalization cuts off for the good region.
The blueward and redward bad regions are from a full spectrum local normalization,
and so there may be obvious discontinuities at the G_END points.
If the G_END points are NOT present, the figure is old and hasn't been redrawn
for the new version of the locally normalized spectrum.
That spectrum is the one in the dif directory though.
Postscript plot of the spectrum with local normalization.
