(cba:news) [Fwd: HS 2219+1824 possible superoutburst]

Joe Patterson jop at astro.columbia.edu
Sun Oct 19 07:30:09 EDT 2008


Dear CBAers,

Patrick's note on HS 2219+1824 is well worth your attention.  This is a 
very interesting, fairly nearby CV with the white dwarf and secondary 
star both visible in the spectrum (quite a rarity).  Past observations 
in superoutburst have been kind of sketchy, and an October eruption is 
happily timed for long time series for northern observers.  At 12th 
magnitude, what's not to like?

Good for not-too-far-south australites, too.  Even fairly short runs at 
the off-longitudes (e.g. AU/NZ) sharpen up the power spectrum A LOT... 
and this gives access to information around the harmonics (which can be 
revealing of disk structure).

A nice paper to read, with a chart and many details, is Rodriguez-Gil et 
al. 2005, A&A, 431, 269.

As usual, good eruptive targets should supplant the nonerupters as 
campaign stars.  Plenty of time for the latter once the erupters have 
faded.  On the other hand, there's always a chance this is a *normal* 
outburst - which are basically featureless photometrically and 
spectroscopically.  In a day or two, we'll know.  And maybe you'll know 
- the detection of superhumps is the gold standard for superoutbursts.

joe


-------- Original Message --------
Subject: (cba:news) HS 2219+1824 possible superoutburst
Date: Sun, 19 Oct 2008 04:40:57 +0000 (GMT)
From: Patrick Schmeer <extpasc at yahoo.de>
Reply-To: cba-chat at cbastro.org
To: CBA News <cba-news at cbastro.org>

Visual magnitude estimates by P. Schmeer, Bischmisheim, Germany:
HS2219+1824 20081017.79 <135 SPK
HS2219+1824 20081018.787 120 SPK  bright (superoutburst?)

This is an excellent opportunity to study a bright outburst
of this relatively 'new' SU UMa-type dwarf nova from the
very beginning. Time-resolved photometry is strongly
recommended.

Precise coordinates (J2000.0):
R.A. 22h21m44.79s, Decl. +18o40'08.3"

Clear skies,
Patrick


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