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From: alex%bkyim.hepnet@Lbl.Gov (ALEX FILIPPENKO, UC BERKELEY, 510-642-1813)
Date: Tue, 18 May 93 18:39:54 PDT
Subject: SN 1993J update
5-18-93
Dear SN 1993J freaks:
I'm sorry it has been a while since my last update, but things have
been pretty well covered in the IAU Circulars. One of the more exciting
events of the past few weeks has been the beginning of the transformation
of SN 1993J into a Type Ib supernova --- thus, SN 1993J is actually a
"Type IIb." This sort of behavior was predicted by theorists, and at least
a few papers have already been submitted to Nature.
Thursday morning I am leaving for the IAU Colloquium 145 (SNe and SNRs)
in Xian, China; I won't be back until June 5, right before the AAS meeting.
Thus, I won't be sending any updates for a while, and it will be virtually
impossible to contact me. It is very important to keep observing the SN,
especially since many of the normal observers will be away from telescopes
the next two weeks. As before, extra efforts should be made during the
upcoming dark run, when many telescopes will not be suitably equipped for
low-dispersion optical spectroscopy.
I will be organizing a special session on SN 1993J at the Xian meeting.
Tentative speakers include Schuyler Van Dyk (radio), Ed Baron (early-time
spectral synthesis), Ken Nomoto (theoretical X-ray and optical light
curves), Alak Ray (theory), Stan Woosley and Ron Eastman (theory), Roger
Chevalier (interaction with circumstellar wind), and Tom Matheson and Alex
Filippenko (optical spectroscopy and photometry). If you would like to
present some results, send me an e-mail message by Wednesday afternoon
or talk to me when you arrive in China.
I am also organizing an informal discussion of SN 1993J at the
upcoming Berkeley AAS meeting. It will be held in room 145 Dwinelle,
Tuesday, June 8, 1993, 4-6 pm. There is no formal agenda at this point.
Perhaps I will make one when I return from China, after hearing from
others who might want to participate.
I expect that each of the presentations will be limited to about
5 minutes (just like the regular AAS talks). The difference is that
there will be plenty of time for discussion. Indeed, I hope we will
spend MOST of the time discussing the supernova. People should feel
free to stand up and show a viewgraph, etc. This applies regardless
of whether you are listed below.
Thus far, the following people are scheduled to speak (but not
necessarily in this order):
Susan Trammell et al. --- spectropolarimetry of SN 1993J
Nic Walton et al. --- optical spectroscopy and photometry of SN 1993J
Juliana Hsu et al. --- theoretical light curves of SN 1993J
Stan Woolsey et al. --- theory of SN 1993J
(I may have accidentally left someone out; if so, please notify me.)
In addition, to bring everyone up to date, there will be short
summaries of the results to be presented at the normal SN 1993J session
to be held Wednesday morning. These will be given by
Tom Matheson et al. --- SN 1993J optical spectroscopy
Young Paik et al. --- SN 1993J optical photometry
George Sonneborn et al. --- SN 1993 UV spectroscopy
If you want to present a short report at this special informal
session, please contact me by e-mail (but don't expect a reply until
June 6!); I imagine everyone can be accommodated.
Below are some notes from other astronomers.
Cheers,
Alex Filippenko
***********
>From G. de Vaucouleurs (gav@astro.as.utexas.edu) (5.15.93)
Note 3 on SN1993J compilations:
*********
From Taichi Kato (tkato@kusastro.kyoto-u.ac.jp)
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