From jop at astro.columbia.edu  Mon Sep 14 19:38:10 2020
From: jop at astro.columbia.edu (Joe Patterson)
Date: Mon, 14 Sep 2020 19:38:10 -0400
Subject: (cba:news) Fwd: (cba:chat) The Return of Maxie?... and some expired
 "suoersoft" stars
In-Reply-To: <CANSMr_LtP3x50sVUxoCD_kkDZ1QEriG9Ldos-HvGv3BSFZKjaA@mail.gmail.com>
References: <CANSMr_LtP3x50sVUxoCD_kkDZ1QEriG9Ldos-HvGv3BSFZKjaA@mail.gmail.com>
Message-ID: <06100de7-a8a2-8ceb-2a55-ac415d144ad3@astro.columbia.edu>

Thanks Joe for this important notification. Maxie has (ASASSN-18ey)still 
not reached its expiration date.  Long time series are no longer 
possible, but a 1-hour observation is just fine.

Our regular-journal paper is nearing completion.  One last outburst of 
any size would be a fitting send-off.

We also have finished with V617 Sgr, QR And, and CI Aql... which are 
bundled in with the paper on IM Nor and T Pyx.  All these stars are done 
for the year.  Around 15 of you, who have observed these stars, will be 
getting the first version of this very detailed paper shortly.

The main issue that the IM Nor et al. paper addresses is this: how much 
does a classical-nova event affect the basic structure of the binary, 
and how long does that disturbance persist?  (And the suggested answers 
are surprising: a lot, and for centuries, possibly millennia).  Sure has 
been fun writing it!

September-October menu coming in a day or so.

joe


-------- Forwarded Message --------
Subject: 	(cba:chat) The Return of Maxie?
Date: 	Mon, 14 Sep 2020 18:08:37 -0500
From: 	Joe Ulowetz <joe700a at gmail.com>
Reply-To: 	cba-chat at cbastro.org
To: 	cba-chat at cbastro.org



If ASASSN-18ey (Maxie) follows the pattern from the past couple of 
years, I expect another outburst sometime within the next few weeks.? I 
got some data last night through the West Coast smoke (and I'm in 
Chicago), and my data looks like mag 16.1 which is about 2 magnitudes 
brighter. Of course, this is a really tentative measurement but I should 
be able to check again tonight.

If you've been following Maxie as well, I encourage you to check as well 
to see if the next outburst has started.

Thanks,
-Joe U.

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From jop at astro.columbia.edu  Wed Sep 23 14:44:21 2020
From: jop at astro.columbia.edu (Joe Patterson)
Date: Wed, 23 Sep 2020 14:44:21 -0400
Subject: (cba:news) Sep-Oct-Nov stars
Message-ID: <8aed0ef0-c259-6128-fa0e-8b6239c11566@astro.columbia.edu>

Hi CBAers,

New stars for the new season.  I'll separate into northern and southern.

As usual, it's a good idea with one or two favorite targets.  (If 
there's gold in any of these stars, I'll send up a signal!)  But 
inevitably all Earthly campaigns have gaps, and if they're too big, then 
period studies become uncertain

NORTH
V392 Per.  Make this recent nova high priority.  So far, the star shows 
a pretty good 1.1 hour signal - a puzzler.  But on a few good nights, 
it's missing - so that's suspicious. Since it's far northern and the 
observing season is just starting, we should be able to do very well on 
it.  Mag 15.0 now.

V378 Peg.  We have some good data from past years - seemingly orbit + 
superhump.  2020 will nail everything down.

V1500 Cyg and BY Cam.  "Asynchronous polars".  The general idea here is:
orbital period stable and known, spin period unstable on some timescale, 
which isn't really known.  Not so hard to measure, though - you just 
need to construct an O-C curve WITHOUT MISCOUNTING CYCLES.  But that can 
be challenging if the orbital signal is not quite of known amplitude and 
phase.  So a really good job is needed - hence the desirablity of 
"crowd-sourcing".  V1500 might be quite faint.

V598 Peg.  A nice well-placed IP, and time for us to mount a big campaign.

SOUTH
CC Scl - A mighty interesting IP, one of the few at short Porb.  Let's 
mount a strong campaign.

AH Men - we haven't written anything on this guy since 1995, and have 
lots of data ready to roll if we can get one more season.

ES Cet - let's extend that the long-term study of timing.

Finally, one subject area I would really like to stress is ORBITAL LIGHT 
CURVES OF OLD NOVAE.  Old just meaning a few (or more) years after the 
nova eruption.  None strike me as being particularly seasonal right now, 
but you might find some that are well-placed and within your magnitude 
limit.  V959 Mon is a definite possibility, but still maybe too early in 
the season...

AAVSO virtual meeting coming up in November - abstracts due Sep 30, I think.

joe
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