SN 1984A Ia in NGC 4419 (Sa) in the Virgo cluster
OBJECT: SN 1984A Ia in NGC 4419 (Sa) in the Virgo cluster. In Leda it is
NGC 4419 (Leda).
DISCOVERY: 1984jan6 UT by Kimeridze (1984)
CfA List of Supernovae.
MAXIMUM: 1984jan17.0 +/- 1 (JD 2445716.5) in B according (barbon1989).
See the US Navy Observatory Julian Date Converter.
This day of the year 17.
SUPERNOVA of the YEAR: 1.
HEADER: Header Common header information for this supernovae.
The common header may (or may not) be updated relative to the header information above
(D. J. Jeffery (2007jan01)).
COMMENTS: A broad line (BL) SN Ia.
SPECTRUM LOG:
JD times for the SN 1984a spectra of wegner1987 and barbon1989.
Bmax JD 2445716.5 (barbon1989) with probably +/-1 uncertainty.
I believe all the spectra are observer frame. But it's bloody
hard to tell with such a small heliocentric velocity and no
telluric lines in the spectra.
For what it is worth, barbon1989 plot the observer-frame spectra,
and so those may be the ones Enrico Cappellaro passed on to me
in 1997. wegner1987 makes no comment on deredshifting any
of his spectra, and so maybe it didn't do that.
The best guess is that the spectra are observer frame.
The wegner1987 time is an estimate since wegner1987 only
give the day as 1984jan10 (and I assume it is a UT date).
There is nothing in the IAU Circulars about the wegner1987 spectrum
either. Now midnight at Kit Peak (where the spectrum was taken)
is about 0.3 days UT, and so the spectrum must have been taken
within about .3 days of .3 UT. It was near the winter solstice
and so the nights were long.
For what it is worth, it may also have been the case that
the best observing time in Asiago (near midnight local time
which is only an hour off UT time) is about midnight UT.
Thus midnight may have been generally about the best observing
time, and therefore one might guess that is when wegner1987
observed.
JD Bmax Heliocentric velocity (Leda, 2007jul03)
5716.5 -277.
Heliocentric velocity Z redshift
-277.0000000000 -0.0009239725
Index JD of some kind Observer phase Rest phase
1 5709.5200000000 -6.9800000000 -6.9864552929 ! barbon1989 1984jan10.02 4100.--6800. and supposedly it is
2 0.0000000000****************************** ! the jan10.2. spectrum.
3 5709.8000000000 -6.7000000000 -6.7061963413 ! wegner1987 1984jan10.3 +/- 0.3 3.2408e+03--6.6992e+03
4 5710.5500000000 -5.9500000000 -5.9555027210 ! barbon1989 1984jan11.05 3905.--6798. (observed) is the one
5 0.0000000000****************************** ! I use, but I don't know
6 5710.7100000000 -5.7900000000 -5.7953547487 ! barbon1989 1984jan11.21 which jan11 spectrum is which.
7 5711.5900000000 -4.9100000000 -4.9145409009 ! barbon1989 1984jan12.09 3900.--6800. is the one I use, but
8 0.0000000000****************************** ! I don't know which of the jan12
9 5711.6700000000 -4.8300000000 -4.8344669147 ! barbon1989 1984jan12.17 is which.
10 5713.6600000000 -2.8400000000 -2.8426265088 ! barbon1989 1984jan14.16 3961.--6799.
11 5724.6000000000 8.1000000000 8.1074910992 ! barbon1989 1984jan25.10 3950.--6799.
12 5733.5400000000 17.0400000000 17.0557590531 ! barbon1989 1984feb03.04 4000.--6800.
13 5735.5400000000 19.0400000000 19.0576087072 ! barbon1989 1984feb05.04 4250.--6760.
14 5742.6400000000 26.1400000000 26.1641749793 ! barbon1989 1984feb12.14 4200.--6799.
15 5771.3900000000 54.8900000000 54.9407637572 ! barbon1989 1984mar11.89 4000.--6799.
REFERENCES:
barbon1989 SN 1984A photometry and spectra.
branch1987 A synow analysis of the day -7 premax
spectrum of wegner1987.
CfA List of Supernovae
where SN 1984A is noted.
CfA Supernova Archive
For SN 1984A, this has 0 spectra and 0 photometry.
conley2006 General value
of 19.4 days for Ia rise time in B.
paturel2003 (Leda) Leda refererence.
wegner1987 A day -7 spectrum.
SUSPECT Index.
SUSPECT Index: SN 1984A Ia.
There are 0 spectra.
There is a great picture of
Fritz Zwicky (Wikipedia).
Just say Fritz Zwicky aloud and you can tell he's an up-to-date person.
CORRECTIONS: Heliocentric velocity -277 +/- 8 km/s (2007jul03) and
NGC 4419 (Leda).
Galactic foreground reddening .14/4=.035
NGC 4419 (Leda).
This is derived from
Schlegel et al. (1998).
OBSERVATIONS: From ?
1) David Jeffery: the Asiago spectra I got from Enrico Cappellaro directly.
The wegner1987 spectrum, I got from David Branch and it may have filtered back
to him. I think it is just a scan of wegner1987's figure.
2) David Branch: I think he mostly just has the 84A spectra that he got from me and
these are in directory /home/branch/synow/84A.
There may be some spectra from Matheson, but file is weird.
3) Eddie Baron: his spectra look like they filtered through me too.
DATE: 1984jan (JD ) with 1984jan17.0 (JD 2445716.5) for B maximum gives:
day = - =
For consistency we always use rest phase and for explicitness to more digits than are significant.
observer phase =
rest phase =
&specnamelist
aname='sn1984a Ia 1984_01_'
ebv=.035 ! This is foreground.
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
! scale_flux=1.d-14
t_rise=19.4d0 ! conley2006: just an average rise time.
v_helio=-277.
ymin2=.1
ymax2=5.
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:
From enrico@athena.pd.astro.it Wed Mar 5 04:13 EST 1997
dear David,
you can retrieve the spectra of SN84A from the address
http://athena.pd.astro.it/~enrico/scra/
I converted them in ASCII format. There is also a file sn84a.doc (see below)
where the spectra are identified.
Concerning nebular spectra of other SN~Ia, the only objects which
we already have published are 91bg and 91t. These are available
without restrictions
let me know if we have problems with the files
ciao
Enrico
No. plate Julian Date Phase Real Phase Telescope Instrument Observer date JD
____________________________________________________________________
A1 3280 -7 11 Asiago 182 B&C+Varo jan10.02 2445709.52
A2 3288 -6 12 Asiago 182 B&C+Varo jan11.05 2445710.55
A3 15704 -6 12 Asiago 122 AVI + S20 jan11.21 2445710.71
A4 3293 -5 13 Asiago 182 B&C+Varo jan12.09 2445711.59
A5 15715 -5 13 Asiago 122 AVI + S20 jan12.17 2445711.67
A6 15719 -3 15 Asiago 122 AVI + S20 jan14.16 2445713.66
A7 15734 +8 26 Asiago 122 AVI + S20 jan25.10 2445724.60
A8 3313 +17 35 Asiago 182 B&C+Varo feb03.04 2445733.54
A9 3316 +19 37 Asiago 182 B&C+Varo feb05.04 2445735.54
A10 15757 +26 44 Asiago 122 AVI + S20 feb12.14 2445742.64
A11 15800 +53 71 Asiago 122 AVI + S20 mar11.89 2445771.39
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Flux unist 10^-14 erg/cm**2/s/A (absolute scale calibrated to V photometry)
Phase is relative to B maximum.
