(cba:news) HT Cas in let's-hope-super outburst

Joe Patterson jop at astro.columbia.edu
Sat Oct 24 16:50:43 EDT 2015


Hi Bill,

Yes, I'd say so - and thanks for asking!  The rarity of the outbursts, 
the deep eclipses, the brightness, the good timing of the season... it's 
too much to ignore.  Fire away!

BTW, SCRATCH V1294 Tau (Tau 2) from the CBA target list.  John 
Thorstensen has just verified Porb from radial-velocity observations. 
 From this, all our candidate periods from the 2002 observations fall 
into place.  We just can't improve on the 2002 findings, now that the 
basic confirmation comes from an independent source.  (We found that 
period too, but sandwiched between 2 others, which now declare 
themselves to be the positive and negative superhump.  A groovy binary

HT Cas - an old friend.  I attach the first paper written on it, also 
the place where the "QPO" and "DNO" terminology originated.  Some good 
light curves in there.  Its CV nature was discovered by Howard Bond (as 
usual!).

joe

Good for small scopes too, btw - as long as it stays bright.


On 10/24/2015 4:10 PM, Bill Stein wrote:
> Is this star of interest to CBA for observations?  I could observe it
> tonight.  I think last major super outburst was in November 2010.
>
> See: http://arxiv.org/abs/1312.5211
>
> Bill
>
> Las Cruces, NM
>
> *From:*cvnet-outburst at yahoogroups.com
> [mailto:cvnet-outburst at yahoogroups.com]
> *Sent:* Saturday, October 24, 2015 1:35 PM
> *To:* Cvnet Outburst
> *Cc:* Baavss Alert
> *Subject:* Re: [cvnet-outburst] FW: [vsnet-alert 19190] ASAS-SN data:
> bright outburst of HT Cas
>
> Correction. Magnitude should be 13.3 not 13.6. Apologies for any
> confusion.  I noted a comparison star magnitude rather than HT Cas in my
> last report.
>
> Gary
>
> On 24 October 2015 at 20:27, Gary Poyner <garypoyner at gmail.com
> <mailto:garypoyner at gmail.com>> wrote:
>
> HT Cas
>
> Oct 24.799     13.6 visual     Outburst
>
> There is an eclipse ephemeris here
> http://www.garypoyner.pwp.blueyonder.co.uk/HTCAS15.txt
>
> It's in need of updating for precise timings of minimum, but it will
> give a good idea as to when eclipses are due.
>
> I made some visual eclipse observations during the 1999 and 2002
> outbursts.  Eclipses are around 2 mags deep and last ~20 minutes when in
> outburst.
>
> Gary
>
> ------------------------------------------------------
>
> Gary Poyner FRAS
> garypoyner at gmail.com <mailto:garypoyner at gmail.com>
>
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>
>
>
> --
>
> ------------------------------------------------------
> Gary Poyner FRAS
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>
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>
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