From jop at astro.columbia.edu  Tue Nov  2 15:59:44 2010
From: jop at astro.columbia.edu (Joe Patterson)
Date: Tue, 02 Nov 2010 15:59:44 -0400
Subject: (cba:news) HT Cas, ES Cet, RX0704+26, BW Scl
Message-ID: <4CD06DB0.9010002@astro.columbia.edu>

Dear CBAers,

HT Cas just erupted.  We've been waiting for that for a very long time, 
and the brightness suggests a super.  For all northerners, this is the 
one to track - until it falls into a tree or something.

Papers with large CBA components have just been submitted on ES Cet 
(MNRAS), and in the next coupla days on RX0704+26 (probably PASP).  I 
attach a draft of the latter, with many CBA authors.  The former is only 
Bob Rea (so far).  Another paper, on BW Scl, is close to completion; 
this is: Rea, McCormick, Christie, Monard, Bolt, Liu.

Our publication rate has dropped recently, partly because I've been 
laboring to squeeze out a big paper on CV evolution (arXiv: 0903.1006).
But it's done now!... and I'll move quickly to convert our many 
observing programs to scientific papers.

ES Cet is a very, very desirable target to campaign on RIGHT NOW.  Cetus 
is available to everybody, the star transits near local midnight... and 
at V=16.5, it's a suitable target for the next coupla weeks, with 
minimal moonlight.  Good for all hemispheres, and try to get long runs 
so we can study possible effects on long timescales.  (This was not 
studied in the Copperwheat et al. paper.)  The orbital signal on this 
guy is just 9 minutes - one of the world's fastest binaries.

The CBA response to the DQ Her timing studies has been superb.  I've 
never gotten such abundant quality data!  We can now *retire* AO Psc and 
FO Aqr for the year, and *promote* the early-morning targets BG CMi, 
RX0704+26, Swift0732-13, and WX Pyx.  Tom Krajci has started up the 
year's campaign on V1062 Tau, and it would be great to get some European 
help on this one; the period's a touch long for reliance on 
single-longitude observation.

But make no mistake - HT Cas is the star du jour.  This eclipsing star 
has always been a touchstone star - but is strangely bashful about 
erupting when anyone's looking!

joe




-------- Original Message --------
Subject: 	Re: [cvnet-outburst] HT Cas possible outburst
Date: 	Tue, 02 Nov 2010 19:21:17 +0000
From: 	Pavol A. Dubovsky <var at kozmos.sk>
Reply-To: 	cvnet-outburst at yahoogroups.com
To: 	cvnet-outburst at yahoogroups.com



Confirmed!
HT CAS 2455503.3007 12.4 Y 12.3 12.5 2395AOK

Clear Skies!
Pavol A. Dubovsky & Binocular Somet 25x100; Binocular 12x60; Newton
Chermelin 300/1500 mm
Astronomical Observatory on Kolonica Saddle,
SLOVAKIA

mikesimonsen wrote:
  >
  >
  > According to Timothy Parsons, USA, the eclipsing UGSU, HT Cas, is in
  > outburst at 12.9v on November 02.4306.
  >
  > The last recorded outbursts were in January 2008 and March 2002.
  >
  > Confirmation of this outburst is requested, and if it is in outburst,
  > time series observations are encouraged.
  >
  > The orbital period is 106 minutes and the light curve should show
  > eclipses, making it both scientifically interesting and fun to observe!
  >
  > Mike Simonsen
  > AAVSO
  >
  >
  >
  >
  > ----------------------------------------------------------
  >
  >
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versi?n: 11/01/10 07:35:00
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From jop at astro.columbia.edu  Tue Nov  2 17:15:37 2010
From: jop at astro.columbia.edu (Joe Patterson)
Date: Tue, 02 Nov 2010 17:15:37 -0400
Subject: (cba:news) Fwd: [cvnet-discussion] AAVSO Special Notice #221
 Outburst of HT Cas
Message-ID: <4CD07F78.6090602@astro.columbia.edu>

Here's Mike's/Matt's formal announcement.  Truer words were never spake.

joe



AAVSO Special Notice #221

Outburst of the infrequently outburst dwarf nova HT Cas
November 2, 2010

As reported by Tim Parson (Circle Pines, Minnesota, USA) and confirmed
by Pavol Dubovsky (Kolonica, Slovakia), the infrequently-outbursting
dwarf nova HT Cas is in outburst.  Parson observed HT Cas in outburst at
m(vis)=12.9 on JD 2455502.93 (2010 November 2.43), and the outburst was
confirmed by Dubovsky at m(vis)=12.4 on JD 2455503.3 (2010 November
2.8).  The last confirmed well-observed outburst of this star occurred
on 2008 January 10.  Observations of this variable are strongly
encouraged at this time.  Both visual and CCD observations are
encouraged, and CCD time-series data are particularly encouraged if
possible.

HT Cas is classified as a UGSU-type dwarf nova with eclipses, having an
orbital period of approximately 0.0736 days (106 minutes).  We ask all
observers to contribute whatever observations they can throughout the
outburst.  CCD observers are asked to perform time series observations
if possible, keeping the best balance between short integration times
and good signal to noise.

HT Cas is located at the following (J2000) coordinates:

         RA: 01 10 12.96 , Dec: +60 04 36.3

Charts for HT Cas may be plotted using AAVSO VSP:

http://www.aavso.org/vsp

There is a m(vis)=13.9 comparison star approximately 30 arcseconds south
of this star, HT Cas is easily separated and the identification should
be clear.

Please promptly submit all observations to the AAVSO using the name "HT
CAS".

This AAVSO Special Notice was prepared by Matthew Templeton.
---------------------------------------------------

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From jop at astro.columbia.edu  Tue Nov  2 18:48:09 2010
From: jop at astro.columbia.edu (Joe Patterson)
Date: Tue, 02 Nov 2010 18:48:09 -0400
Subject: (cba:news) Fwd: (cba:chat) HT Cas
Message-ID: <4CD09529.3040902@astro.columbia.edu>

An earlier message on HT Cas (and other stars) got delayed slightly... 
but the upshot is, fire away on the mysterious HT Cas, a 100-minute deep 
eclipser, as long as you can!

joe

-------- Original Message --------
Subject: (cba:chat) HT Cas
Date: Tue, 2 Nov 2010 22:32:24 +0100
From: Enrique de Miguel Agustino <demiguel at uhu.es>
Reply-To: cba-chat at cbastro.org
To: cba-chat at cbastro.org

Dear all,

I started an all-night run on HT Cas about 90 min ago.
Coverage from other sites would certainly help in
having an almost continuous light curve.

Enrique de Miguel
____________________________________________________________
Center for Backyard Astrophysics (CBA) mailing lists
https://cbastro.org/communications/mailing-lists/



From jop at astro.columbia.edu  Sat Nov  6 07:43:25 2010
From: jop at astro.columbia.edu (Joe Patterson)
Date: Sat, 06 Nov 2010 07:43:25 -0400
Subject: (cba:news) HT Cas and the IPs
Message-ID: <4CD53F5D.8000209@astro.columbia.edu>

Dear CBAers,

Most of you know the story on HT Cas by now - bright, large superhumps, 
deep eclipses, well-placed for all borealites.  Just a great target for 
all northern CBAers.  For a change, *these* light curves are suitable 
for framing!

Hard to compete with that... but let me try.  We've also been getting 
good coverage on several DQ Hers (intermediate polars), and I've been 
scrambling to keep up with the analysis.  Here's a progress report:

* AO Psc, FO Aqr: done for the year
* RX0704+26: done for now, paper submitted; pick up again in Dec-Jan
* V2306 Cyg: done for the year - this star is complicated!
* V709 Cas:  definitely good for continuing this productive campaign
              (led by Enrique and Jim Jones); however, this year's signal
              is the first harmonic, at 156.5 s - so you must use good
              time resolution (40 s or better)
* IGR0023+61: yes, in season, strong pulse, absolutely a good target
               throughout the month.
* RX2133+51: great campaign (led by Enrique, Tut, David Boyd, and Bob
              Koff), but we're done; a few pulse timings in January
              would be nice, to nail down the long-term ephemeris
* XSS0056+46: now in mid-season - excellent for long time series from
               all longitudes
* V1062 Tau: Enrique and Tom have started up the campaign, and the
              periods are detected despite their length (1 and 10 hr).
              Good target, but only for *long* time series.
* RX0636+35: Tom has been getting steady and excellent coverage on this
              star.  Somewhat early in the season - but if his coverage
              could be complemented by long time series from Europe, we
              could nail the elusive long period, not just the short.
              Especially NOW, to connect up with Tom's streak.
* V2069 Cyg: (RX2123+42) Let's squeeze in some good time series of this
              star before the season's over!
* BG CMi, HT Cam, WX Pyx: time to start the season on these guys.

That's a first installment review of the DQs.  Clear skies!

I'll attach the time series to date for RX0636+35 (mostly Tom).  As you 
can see if you inspect it, it still suffers from zero European coverage.
Time series very soon would merge very well with this, and be very 
determinative!

joe

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From jop at astro.columbia.edu  Sun Nov 28 15:53:39 2010
From: jop at astro.columbia.edu (Joe Patterson)
Date: Sun, 28 Nov 2010 15:53:39 -0500
Subject: (cba:news) (cba:chat) V2069 Cyg/RX2123+42 - season over?
In-Reply-To: <4CF29EDB.1040602@tularosa.net>
References: <4CF29EDB.1040602@tularosa.net>
Message-ID: <4CF2C153.1030409@astro.columbia.edu>

Hi Tom et al.,

Yes, it's time to pull the plug on V2069 Cyg.  And I think on HT Cas as 
well (though I'm still studying that data, and might change my mind in a 
few days).  For an evening target, I strongly recommend XSS0056+4548, 
and I recommend it in BLUE or INFRARED light.  The star has two periods 
of about equal strength (0.03 mag), at 465 and 488 s.  It is *likely* 
that these signals have greatly different colors - and to test this, I 
recommend obtaining time series in B or I light (your choice).  Our past 
coverage in unfiltered ("pink") light is effectively about 6000 A - so 
either B or I light would give us some lever-arm on the color 
dependence.  We would like to go for 2-3 more weeks on this star until 
completing the season.  This paper is mostly finished, and just awaits 
that one result - a measure of the wavelength dependence of those two 
ocillations.

In the morning sky, I recommend picking up RX0704+26 ("Gem") again, now 
that we are nearing mid-season.  This paper is being refereed now, so in 
2-3 weeks we'll add in the new timings and send off the revision. 
Remember: it's a 480 s pulsation, and most of the power is at 240 s, so 
you'll need a cycle time of *not more than 60 s* to see the signal 
satisfactorily.  It's a 16th mag star, and you might think that's a 
stretch - but this is a VERY strong signal and really not difficult.

Time to end the campaign on V709 Cas too.

Finally, let's get going on Swift 0732.5-1331 (see Koji Mukai's website 
on intermediate polars for full information on this guy).  Exact 
position 07 32 37.64  -13 31 09; this is the NE star of a pair separated 
by 2" - it's fine if you include both stars.  The photometry's terrible, 
but the periodic signals jump right out!  (But a B filter might help.)

Joe


On 11/28/2010 1:26 PM, Tom Krajci wrote:
> Regarding V2069 Cyg/RX2123+42...is the season over?  I can get a little
> over two hours in the evening, but that will keep shrinking as the days
> pass.
>
> Thanks in advance,
> Tom Krajci
> Cloudcroft, NM
>



From jop at astro.columbia.edu  Tue Nov 30 10:55:37 2010
From: jop at astro.columbia.edu (Joe Patterson)
Date: Tue, 30 Nov 2010 10:55:37 -0500
Subject: (cba:news) OT_012059.59+325545.0 bright outbusrt
Message-ID: <4CF51E79.8020605@astro.columbia.edu>

Dear CBAers,

This looks like a mighty interesting star.  Reasonably well placed in
the sky, bright, and a candidate for a more-than-usually-interesting
dwarf nova.

It's somewhat surprising that a star this faint would have a high proper
motion, so the star still needs confirmation.  Give it a try - and then
fire away with time series if it looks legit.  Itagaki is plenty
experienced, so it's a probable.

joe

-------- Original Message --------
Subject: [vsnet-outburst 11854] OT_012059.59+325545.0 bright outbusrt
Date: Wed,  1 Dec 2010 00:26:32 +0900 (JST)
From: Hitoshi Yamaoka <yamaoka at ursa.phys.kyushu-u.ac.jp>
To: vsnet-alert at ooruri.kusastro.kyoto-u.ac.jp,
vsnet-outburst at ooruri.kusastro.kyoto-u.ac.jp,
vsnet-newvar at ooruri.kusastro.kyoto-u.ac.jp

Dear all,

Itagaki-san reported his detection of a bright outburst (mag about
12.3) of a star located at 01:20:59.59 +32:55:45, which is mag about
19-20 in quiscent and shows a relatively large proper motion.

OT_J012059.59+325545.0  20101130.50663 123C KIt

>C2010 11 30.50663 01 20 59.59 +32 55 45.0     12.3 ?D89

Confirmation and further follow-up observation is urgently needed.

Cheers,
Hitoshi Yamaoka, Kyushu Univ., Japan
yamaoka at phys.kyushu-u.ac.jp <- changed!