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<h1> SN 1990N Ia in NGC 4639 (Sbc) </h1>
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<a href="../../../../../writer/chaucer/chaucer_astrolabe.png">
<img src="../../../../../writer/chaucer/chaucer_astrolabe_thumb.png" align=right width=20%
alt="Geoffrey Chaucer with an astrolabe."> </a>
<pre>
OBJECT: SN 1990N Ia in NGC 4639 (Sbc). In <a href="http://leda.univ-lyon1.fr/">Leda</a> it is
<a href="http://leda.univ-lyon1.fr/ledacat.cgi?NGC%204639&ob=ra">NGC 4639 (Leda)</a>.
DISCOVERY: 1990jun23 by Thouvenot
<a href="http://cfa-www.harvard.edu/cfa/ps/lists/Supernovae.html">CfA List of Supernovae</a>.
MAXIMUM: Bmax: 1990jul09.40 +/- 0.14 UT (JD 2448081.90 +/- 0.14) (riess2005).
1990jul10.2 +/- 0.5 UT (JD 2448082.7) in B (lira1998).
1990jul10.5 +/- 1 UT (JD 2448083.0) in B (leibundgut1991).
I have to go with latest Bmax value.
See the US Navy Observatory <a href="http://aa.usno.navy.mil/data/docs/JulianDate.html">Julian Date Converter</a>.
This day of the year <a href="../../listdata/days.html">191</a>.
SUPERNOVA of the YEAR: <a href="../../listdata/desig.html#desig_of_year">14</a>.
HEADER: <a href="./header">Header</a> Common header information for this supernovae.
The common header may (or may not) be updated relative to the header information given here
(<a href="http://www.nhn.ou.edu/~jeffery/">D. J. Jeffery (2007jan01)</a>).
COMMENTS: A core normal SN Ia.
REFERENCES:
<a href="http://www.cfa.harvard.edu/iau/lists/Supernovae.html">CfA List of Supernovae</a>
where SN 1999N is noted.
<a href="http://www.cfa.harvard.edu/oir/Research/supernova/SNarchive.html">CfA Supernova Archive</a>
This has 13 SN 1990N spectra which probably are some of the ones I have, but in different versions.
Mostly though they are nebular spectra from 1991 and 1992.
<a href="../../../../../aalib/aastex/ref.html#conley2006">conley2006</a> General value
of 19.4 days for Ia rise time in B.
<a href="../../../../../aalib/aastex/ref.html#filippenko1992c">filippenko1992c</a>
Mostly on 91T, but there are 2 new 90N spectra.
<a href="../../../../../aalib/aastex/ref.html#gomez1996">gomez1996</a>
Some 90N spectra among many others.
<a href="../../../../../aalib/aastex/ref.html#ines2000">ines2000</a> The final IUE archive will
have he best versions of the 90N IUE UV spectra. These should supercede the old versions I have.
<a href="../../../../../aalib/aastex/ref.html#jeffery1992">jeffery1992</a> On early 90N spectra.
<a href="../../../../../aalib/aastex/ref.html#leibundgut1991">leibundgut1991</a> On early 90N spectra and photometry.
<a href="../../../../../aalib/aastex/ref.html#lira1998">lira1998</a> Improved 90N and 91T photometry.
<a href="../../../../../aalib/aastex/ref.html#mazzali1993b">mazzali1993</a> On early 90N spectra and photometry.
<a href="../../../../../aalib/aastex/ref.html#paturel2003">paturel2003 (Leda)</a> Leda refererence.
<a href="../../../../../aalib/aastex/ref.html#riess2005">riess2005</a> Updated Bmax.
<a href="http://bruford.nhn.ou.edu/~suspect/cgi-bin/snindex.cgi">SUSPECT Index</a>.
<a href="http://bruford.nhn.ou.edu/~suspect/cgi-bin/search.cgi?spec=yes&OBJECT=1990N">SUSPECT Index: SN 1990N Ia</a>.
There are only 6 spectra: 1 from mazzali1993 and 5 from gomez1996.
<a href="../../../../../aalib/aastex/ref.html#turatto1995">turatto1995</a> A private communication
of the 1990jun28 Asiago 90N spectrum.
CORRECTIONS: Heliocentric velocity 982 +/- 8 km/s (2007jul04) from
<a href="http://leda.univ-lyon1.fr/ledacat.cgi?NGC%204639&ob=ra">NGC 4639 (Leda)</a>.
Galactic foreground reddening .11/4=.0275
<a href="http://leda.univ-lyon1.fr/ledacat.cgi?NGC%204639&ob=ra">NGC 4639 (Leda)</a>.
This comes from
<a href="../../../../../aalib/aastex/ref.html#schlegel1998">Schlegel et al. (1998)</a>.
<hr>
OBSERVATIONS: From
1) David Jeffery's old catalog:
2) David Branch:
3) Eddie Baron:
4) SUSPECT:
5) CfA Supernova Archive:
SPECTRUM LOG:
JD times for the SN 1990N spectra of various observers.
Bmax: 1990jul09.40 +/- 0.14 UT (JD 2448081.90 +/- 0.14) (riess2005).
1990jul10.2 +/- 0.5 (JD 2448082.7) B (lira1998).
Some of the spectra are observer frame and some are rest frame.
In some cases, we have had to estimate the JD.
JD Bmax Heliocentric velocity (Leda, 2007jul04)
8081.90 982.
Heliocentric velocity Z redshift
982.0000000000 0.0032755994
Index JD of some kind Observer phase Rest phase
1 8068.6600000000 -13.2400000000 -13.1967726592 ! leibundgut1991 1990jun26.16 3200.--8399.99991 (observed)
2 0.0000000000****************************** ! Precise JD from CfA FITS header.
3 8071.3000000000 -10.6000000000 -10.5653920081 ! turatto1995 1990jun28.8 3823.--8047. (observed)
4 0.0000000000****************************** ! Crude estimate of JD: -.8/+.2
5 8075.4900000000 -6.4100000000 -6.3890719596 ! leibundgut1991 1990jun02.99 980.582--7723.596376 (observed)
6 0.0000000000****************************** ! Precise JD from CfA FITS header.
7 8084.5000000000 2.6000000000 2.5915112473 ! mazzali1993 1990jul12.0 3750.--8049. (observed)
8 0.0000000000****************************** ! The FITS JD may be rounded.
9 8089.8000000000 7.9000000000 7.8742072513 ! leibundgut1991 1990jul17.3 3915.--9880. (observed)
10 0.0000000000****************************** ! .3 based on Lick Obs. time.
11 8099.6500000000 17.7500000000 17.6920479381 ! CfA SN Archive 1990jul27.15 3187.743--7486.774614
12 0.0000000000****************************** ! Precise JD from CfA FITS header.
13 8103.8000000000 21.9000000000 21.8284985828 ! filippenko1992c 1990jul31.3 3885.--9880. (observed?)
14 0.0000000000****************************** ! .3 based on Lick Obs. time.
15 8132.8000000000 50.9000000000 50.7338163409 ! filippenko1992c 1990aug29.3 3885.--9900. (observed?)
16 0.0000000000****************************** ! .3 based on Lick Obs. time.
17 8268.6500000000 186.7500000000 186.1402790110 ! gomez1996 1991jan12.15 3410.--9787. (rest)
18 8309.7300000000 227.8300000000 227.0861567179 ! gomez1996 1991feb22.23 3402.79--9778.7197 (rest)
&specnamelist
aname='sn1990n Ia 1990_07_'
ebv=.0275
epoch= ! This parameter needs to updated for the particular spectrum.
idifmake=0
iformat=1 ! This has to be checked for every spectrum.
ismooth=1 ! Smoothing?
itick=2
itickln=4
t_rise=19.4d0 ! conley2006: just an average rise time.
v_helio=982.
ymin2=1.e-15
ymax2=7.e-14
ymin3=.3
ymax3=3.
wlammin1=
wlammax1=
wlammin2=
wlammax2=
wlammin3=
wlammax3=
/
<hr>
<a href="./figure/sn1990n_1990_07_.gif">
<img src="./figure/sn1990n_1990_07_.gif" align=middle width=80%
alt="./figure/sn1990n_1990_07_.gif"> </a>
<a href="./figure/sn1990n_1990_07_.ps">Postscript plot of the spectrum.</a>
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<a href="./figure/sn1990n_1990_07_.dif.gif">
<img src="./figure/sn1990n_1990_07_.dif.gif" align=middle width=80%
alt="./figure/sn1990n_1990_07_.dif.gif"> </a>
<a href="./figure/sn1990n_1990_07_.dif.ps">Postscript plot of the spectrum</a> with local normalization.
<hr>
Information from somewhere.
FITS: Fits format information from the observers if there is any.
END: