[vsnet-alert 2001] (fwd) SN1998di (Schwartz)

[Taichi Kato <tkato>]

Forwarded message on SN1998di, by permission of Michael Schwartz (originally
posted to isn_chat):

Date: Tue, 04 Aug 1998 15:05:25 -0700
From: "M. Schwartz" <pfactors@ix.netcom.com>
Subject: No SN1998di


Hi -

I knew that this would happen sooner or later, but SN1998di
is a cataclysmic variable (CV) that comes from a dwarf star
that has ignited due to material taken off an unseen companion.
The only consolation is that they are more rare than supernovae.

So, let's erase this one from the record books and let the
CVers take over.  Statistically speaking, this is never supposed
to happen.  So this means that the odds of it happening to you
are astronomical (so to speak).

Good hunting!!!

Mike

> S. Jha, P. Garnavich, P. Challis and R. Kirshner, Center for Astrophysics,
> report that a spectrum of SN 1998di taken by P. Berlind on Aug 4.4 UT at
> the Whipple Observatory 1.5-m telescope (+ FAST spectrograph) exhibits a
> blue continuum with shallow absorption troughs shortward of 500 nm. The
> object appears 4" east and 4" north of an anonymous galaxy with a
> recession velocity of 10750 +/- 30 km/s. The shallow absorption features
> have widths of approximately 3000 km/s (FWHM) and correspond to He I
> absorption at zero radial velocity. The spectrum resembles that of CR Boo,
> a hydrogen-deficient dwarf nova, near maximum (Patterson et al., 1997,
> PASP, 109, 1100).  We conclude that SN 1998di is a Galactic dwarf nova
> discovered in outburst projected near the distant anonymous galaxy. 
 
-- 
Michael Schwartz, Director
Tenagra Observatories, Ltd.
Cottage Grove, OR  97424
(541) 942-0198
http://vsnet2.netcom.com/~pfactors/tenagra.html

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