[vsnet-alert 15527] Re: Next HST observations: PU CMa & IY UMa

[Rod Stubbings]

Hi Boris,

PU CMa is in outburst as of tonight at 11.2. At this brightness it could be 
a possible superoutburst.

Regards,
Rod.


Rod Stubbings,
Tetoora Road Observatory,
Victoria, Australia.
stubbo at sympac.com.au
http://rodstubbingsobservatory.wordpress.com/



----- Original Message ----- 
From: "Boris Gaensicke" <Boris.Gaensicke at warwick.ac.uk>
To: "Gary Poyner" <garypoyner at blueyonder.co.uk>; "Roger Pickard" 
<roger.pickard at sky.com>; "David Boyd" <davidboyd at orion.me.uk>; "Mike 
Simonsen" <mikesimonsen at aavso.org>; "Elizabeth Waagen" <eowaagen at aavso.org>; 
"Arne Henden" <arne at aavso.org>; "Arto Oksanen" <arto.oksanen at jklsirius.fi>; 
"Bart Staels" <staels.bart.bvba at pandora.be>; 
<vsnet-alert at ooruri.kusastro.kyoto-u.ac.jp>; "Stuart P Littlefair" 
<s.littlefair at sheffield.ac.uk>; "Rod Stubbings" <stubbo at sympac.com.au>; 
<cba-chat at cbastro.org>; "Joe Patterson" <jop at astro.columbia.edu>; "Fritz 
Osell" <Fritz.Osell at north-ok.edu>
Sent: Sunday, March 17, 2013 12:56 AM
Subject: Re: Next HST observations: PU CMa & IY UMa


> Dear All,
>
> well, that was an exciting week: V485 Cen went
> into outburst March 12th, with the HST observations
> scheduled for March 16th ... you can imagine that
> STScI were rather nervous, and it was a quite
> close call to get permission to go ahead with
> the HST observations. We got the ultraviolet
> spectrum, and as expected, it looks different from
> the other stars we observed so far, as the companion
> of V485 Cen is not a normal low-mass main-sequence
> star, but the left-over nuclear evolved core of a
> previously more massive star that got stripped of its
> envelope - the first one of this small class of stars
> where we managed to get a good spectrum.
>
> Your very intense monitoring of the star during
> and following the outburst was the key to obtain
> permission to go ahead with the HST observations,
> as it demonstrated that this was not a superoutburst,
> and that V485 Cen was back in quiescence in time
> for the HST observations.
>
> But, no time to rest: the next two targets on the
> HST schedule are:
>
> PU CMa: Mar 22, 2013 00:00:43 to Mar 22, 2013 02:36:08
>
> and
>
> IY UMa: Mar 29, 2013 23:43:52 to Mar 30, 2013 02:18:13
>
> Both are short-period SU UMa type dwarf novae, with
> superoutbursts occurring very roughly once a year, and
> normal outbursts every few months. IY UMa is
> eclipsing.
>
> Both will be dangerously bright during outburst,  thus,
> please keep a very close eye on them up until the scheduled
> time of the HST observations - this week just showed
> how important your monitoring is for this project!
>
> Best wishes,
>
> Boris
>
> -----------------------------------------------------------------------------------------------------
> For more information on this HST program, see
>
> http://deneb.astro.warwick.ac.uk/phsdaj/public_html/12870/
> http://deneb.astro.warwick.ac.uk/phsdaj/public_html/12870/Targets.html
>
>
>
> -----
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> Version: 2013.0.2904 / Virus Database: 2641/6183 - Release Date: 03/16/13
> 



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