[vsnet-alert 15529] Re: Next HST observations: PU CMa & IY UMa

[Boris Gaensicke]

Hi Rod,

thanks! Ah, this is not our lucky week, I guess, but it had
to happen sooner or later. Please keep monitoring...

Best wishes,

Boris


On 18 March 2013 10:11, 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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