[vsnet-alert 15528] Re: (cba:chat) Next HST observations: PU CMa & IY UMa

[Peter Nelson]

I can confirm Rod's observation:

PU CMa V=11.87  2013-03-18 09:42UT

Regards
Peter

On 18/03/2013, at 9:11 PM, Rod Stubbings <stubbo at sympac.com.au> wrote:

> 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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> 
> 
> 
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