From jop at astro.columbia.edu  Thu May 12 05:48:36 2016
From: jop at astro.columbia.edu (Joe Patterson)
Date: Thu, 12 May 2016 05:48:36 -0400
Subject: (cba:news) OGLE-IV Pre-discovery Observations of MASTER OT
 J051032.58-692130.4 (ATel #9040)
In-Reply-To: <1226512896.941085.1462988571422.JavaMail.yahoo@mail.yahoo.com>
References: <1226512896.941085.1462988571422.JavaMail.yahoo@mail.yahoo.com>
Message-ID: <b74de450-88e6-4a0a-2f8f-f4ec42208bee@astro.columbia.edu>

This discovery of what appears to be a classical nova couldn't arrive at 
a worse time (LMC in May), but the reported eclipses and long P_orb make 
it an important star to know about.  Australites, see what you can learn 
about it!

I've completed preliminary analysis on two program stars - V1223 Sgr and 
LN UMa.  Both can be taken off the menu, though it would be nice to 
sneak in some V1223 observations *late* in the observing season 
(September).  V803 Cen remains a very good target.

joe


-------- Forwarded Message --------
Subject: [vsnet-alert 19818] OGLE-IV Pre-discovery Observations of 
MASTER OT  J051032.58-692130.4 (ATel #9040)
Date: Wed, 11 May 2016 17:42:51 +0000 (UTC)
From: Patrick Schmeer <pasc1312-aavso at yahoo.de>
Reply-To: Patrick Schmeer <pasc1312-aavso at yahoo.de>
To: vsnet-alert at ooruri.kusastro.kyoto-u.ac.jp, 
vsnet-outburst at ooruri.kusastro.kyoto-u.ac.jp, 
cvnet-outburst at yahoogroups.com, baavss-alert at yahoogroups.com

OGLE-IV Pre-discovery Observations of
MASTER OT J051032.58-6921

Excerpt:
"... The star was severely saturated in the image
acquired on 2016 April 28.97626 UT, meaning
it was brighter than I=11 mag. The last pre-
eruption image was taken eight nights earlier
(on April 21.00403 UT).
The progenitor was clearly visible in the OGLE
images ... and showed eclipsing-like variability
with a period of 2.6508 +/- 0.0002 d. ..."

Full text (ATel #9040):
http://www.astronomerstelegram.org/?read=9040

Regards,
Patrick


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From jop at astro.columbia.edu  Wed May 18 23:23:34 2016
From: jop at astro.columbia.edu (Joe Patterson)
Date: Wed, 18 May 2016 23:23:34 -0400
Subject: (cba:news) May-June stars
Message-ID: <0e1c7ea0-0081-928e-9cd4-4f2ee9c3b273@astro.columbia.edu>

Here's some recommendations and thoughts re targets...

I forgot to mention ES Dra.  I think we're ready to close that one for 
the year... but Enrique, could you comment?  With final exams etc., I've 
fallen behind in the analysis.

joe p
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From jop at astro.columbia.edu  Tue May 31 04:37:34 2016
From: jop at astro.columbia.edu (Joe Patterson)
Date: Tue, 31 May 2016 04:37:34 -0400
Subject: (cba:news) (cba:chat) DQ Her
In-Reply-To: <CAPvxGuW+3g4jQ20HFWZnpSicPJAkz9b1vhf0VdLxeT+MQj49=Q@mail.gmail.com>
References: <f8debfb68851ea36e868fa3714a7157b@newcastleobservatory.ca>
 <574CAD38.4080306@astro.columbia.edu>
 <CAPvxGuW+3g4jQ20HFWZnpSicPJAkz9b1vhf0VdLxeT+MQj49=Q@mail.gmail.com>
Message-ID: <574D4D4E.60202@astro.columbia.edu>

Yes, some CBAers might be able to resolve that signal, though you'd need 
a cycle time of less than 25 s to do so.  That would be tough for most 
people... so the main idea here is to explore for signals at or near the 
*orbital* frequency.  Like for UX UMa.

An aspect of this that is also somewhat demanding, but interesting, is 
the shape of the deep eclipse.  We know that it is slightly asymmetric, 
but have never understood exactly why.  (Of course there's a story - 
"the hot spot" - but it'd be nice to improve on that.)  Since it's a 
deep eclipse (to 17th mag), you need longish integrations to explore 
this.  A study of the variations of brightness AT MID_ECLIPSE could be 
fascinating, and has never been done for this famous star.

Finally, there's a contaminating star about 4 arcsec away.  Have a night 
of really good seeing? Know when the eclipses occur?  Then take quite 
long images near mid-eclipse, and measure the contribution of the 
contaminant.  Filtering isn't necessary or desirable; the key question 
is, how much of the flux detected by *your system* is from the 
contaminating star?

I wrote a paper on this star way back when:

http://articles.adsabs.harvard.edu/full/1979PASP...91..487P

Wrote it in longhand, too.  I think I wrote everything longhand then.

joe p




On 5/30/2016 6:26 PM, Lew Cook wrote:
> A reminder on DQ Her: It is pretty bright, and also has deep eclipses -
> but -- there are circumstances which 15 - 20 sec image times will show
> the rotation of the WD - 71 sec. I suppose you could vary the CCD
> sampling times to coincide with the brightness of the system to get both
> periods well.
>
> Lew
>
>
> On Mon, May 30, 2016 at 9:14 PM, Joe Patterson <jop at astro.columbia.edu
> <mailto:jop at astro.columbia.edu>> wrote:
>
>     I think LX Ser and V380 Oph are the prime evening+ northern stars -
>     both admittedly "fishing expeditions", but that's about half of what
>     we do. DQ Her also - far from a fishing expedition.  We'd like to
>     get coverage on it similar to what we got on UX UMa.
>
>     Lots of really good morning targets, and prime season for the south
>     with all those Sgr-Sco novae finally coming into view.
>
>     joe
>
>
>
>     On 5/30/2016 4:11 PM, Michael J. Cook, Newcastle Observatory wrote:
>
>         Any priority of the May/June stars on the target list?
>
>         --
>
>         Michael J. Cook
>
>         AAVSO: CMJA
>         CBA: Ontario
>         MPC: H61
>
>         *Web Site:* http://www.newcastleobservatory.ca
>         *Google+*: https://plus.google.com/u/0/104889693035082401323
>         *Twitter:* https://twitter.com/newcastleobserv
>         *FaceBook:* https://www.facebook.com/michael.cook.9406
>         *Skype:*  newcastleobservatory
>
>
>
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