From jop at astro.columbia.edu  Sat Jun  4 05:40:12 2016
From: jop at astro.columbia.edu (Joe Patterson)
Date: Sat, 4 Jun 2016 05:40:12 -0400
Subject: (cba:news) A W UMa joining the CV club?
In-Reply-To: <20160604070142.5DD4B16F8509@sedna.astro.columbia.edu>
References: <20160604070142.5DD4B16F8509@sedna.astro.columbia.edu>
Message-ID: <caee4411-2629-cc36-b0b2-2c71a62f5b18@astro.columbia.edu>

Definitely worth tracking with time-series photometry!  Right away, 
while the "outburst" (?) is ongoing.

joe


-------- Forwarded Message --------
Subject: ATel  9112
Date: Sat,  4 Jun 2016 03:01:42 -0400 (EDT)
From: atel at astronomerstelegram.org
To: jop at astro.columbia.edu

------------------------------------------------------------------------------ 
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The Astronomer's Telegram 
http://www.astronomerstelegram.org 
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Posted: Within the last 24 hours
==============================================================================
ATEL #9112							     ATEL #9112

Title:	CRTS discovery of an outburst from a short period binary system
Author:	A. J. Drake, S. G. Djorgovski, A. A. Mahabal, M. J. Graham,
		C. Donalek,  R. Williams (Caltech); M. Catelan (PUC Chile); E. 
Christensen,
		 S. M. Larson (LPL/UA)
Queries:	ajd at cacr.caltech.edu
Posted:	4 Jun 2016; 03:25 UT
Subjects:Optical, Request for Observations, Binary, Star, Transient,
		Variables

Here we report the discovery of an outburst from known short period binary
system 2MASS_J16211735+4412541. On 2016-06-03.45 UT, 2MASS_J162117 was 
detected
by CRTS as a transient event (<a 
href=http://nesssi.cacr.caltech.edu/catalina/20160603/1606031430654136549.html>
CSS160603:162117+441254</a>) with V_CSS=13.3. This system has  an 
average magnitude of V_CSS=15.0 and an amplitude of 0.5 mags based on
359 prior observations taken between 2005-05-17 to 2016-05-14. No prior 
outbursts
have been observed.
This system was previously identified as a contact eclipsing binary (WUMa)

by Palaversa et al. (2013, AJ, 146, 101), Lohr et al. (2013, A&A 549, 86)

and Drake et al. (2014a, ApJS, 213, 9) with a period of P=0.207852(1) days.

This period places the system is among the ~0.1% of ultra-short period
binary  systems known to have periods shorter than the 0.22 day contact 
binary
minimum (Rucinski 2007, MNRAS, 382, 393). Due to its unusual period the 
source
was  studied by Lohr et al. (2013) and Drake et al. (2014b, AJ, 790, 157).
2MASS_J162117 has SDSS magnitudes u =17.54, g=15.76, r=14.92, i=14.56 and
z=14.37, and GALEX mags FUV=20.5, NUV=20.2. The extinction corrected 
SDSS colors
are  consistent with a MS+MS (WUMa) binary. However, the object is near the
SDSS  saturation limit. The GALEX magnitudes are most consistent with a 
WD+MS
binary  system. Based on Drake et al. (2014b) we find that the shape of 
phase-folded

lightcurve is more consistent with the ellipsoidal (WD+MS) variables than
WUMa.
If this system is a MS+MS contact binary, the outburst could be the 
beginning

of a very rare binary merger event similar to V1309 Scorpii (Tylenda et
al. 2011,  A&A, 528, 114). However, based on the GALEX data and 
lightcurve shape,
we  suspect that the event is more likely an outburst from an unusual 
cataclysmic

variable system.
We request photometric and spectroscopic follow-up to determine the 
nature of the system and the outburst.
Archival photometry for this	source is public available from the <a 
href=http://nesssi.cacr.caltech.edu/DataRelease>CSDR2</a> pages. All 
CRTS transients are discovered within minutes of observation and openly

published. Links to all CRTS transients can be found at 
http://crts.caltech.edu/.

We are grateful to the all the observers involved in follow-up observations.

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Password Certification: Andrew J. Drake (ajd at cacr.caltech.edu)
http://www.astronomerstelegram.org/?read=9112
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From jop at astro.columbia.edu  Tue Jun 14 05:37:02 2016
From: jop at astro.columbia.edu (Joe Patterson)
Date: Tue, 14 Jun 2016 05:37:02 -0400
Subject: (cba:news) DQ Her, V1223 Sgr, RX1654-19, and the Hercules transient
Message-ID: <80fc333e-8d34-a729-83cc-4594b4d42cf3@astro.columbia.edu>

Hi CBAers,

A few notes concerning stars we're covering.

1. We have the long-term (6-year) spin and orbit ephemerides now for 
RX1654-19.  As usual, Berto has been the powerhouse for this one.  No 
need for further coverage this year,  In future years, we just need 
"maintenance" - a few runs per year.  BTW, it's a spin-up guy - spinning 
up on a timescale (P/Pdot) of 20 million years.

2. Ditto for V1223 Sgr.  We have now an ephemeris over 35 years, and it 
has been rapid spin-down throughout.  This is really puzzling. 
Astrophysical orthodoxy says that DQ Her stars should have episodes of 
spinup and spindown, alternating depending on accretion rate (spinning 
up when Mdot is high, because accretion torques are then high).  The 
alternations might well take centuries or millennia, so it's no shocker 
that we can't test this theory.  BUT by my reckoning, V1223 Sgr is the 
most intrinsically luminous (X-ray-UV-optical) of all the DQs, and it's 
the only one that is certifiably spinning down, not up.  Just the 
opposite of what we expect.  We'll want to keep a close eye on it in 
future years, and scratch our heads a lot in the meantime... but for 
observing, we can take it off the 2016 list.  This is another star which 
has succumbed to Berto's Boer ferocity.

3. The Hercules transient (1621+44). Wow. A photometric and 
spectroscopic gift to patrons of CVs.  And apparently within our ken to 
study at quiescence, too.  The coverage has been wonderful, and the star 
has been generous with its secrets and gracious with its timing - 
erupting in late May, when it transits near local midnight.  It's 
obviously gunning for publicity, and we'll oblige!  All hands on deck.

4. DQ Her.  Lots of very good data coming in, and even the 30-second 
data is proving quite adequate to time the 71-second oscillation - so 
much so that we don't particularly need that high time resolution any 
more (the spin ephemeris is nailed down).  But the light curve on 
orbital (4.6 hour) timescales is a different story.  That one looks 
promising but could really use more help from Europe.  Long runs in the 
European summer ate tough with the short nights... but try!  And for the 
norteamericanos, keep it up.

All for now*.  For both Enrique and me, summer has brought a respite 
from the job and the leisure to dive into these light curves.  We'll be 
able to supply more info on the analysis side.  (And feel free to write, 
too.)

joe p

*BTW, targets unmentioned doesn't mean "uninteresting" - just not yet 
fully digested.

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From jop at astro.columbia.edu  Wed Jun 15 04:42:31 2016
From: jop at astro.columbia.edu (Joe Patterson)
Date: Wed, 15 Jun 2016 04:42:31 -0400
Subject: (cba:news) ASASSN-16fy,
 a likely new dwarf nova of more-than-ordinary interest
In-Reply-To: <E1bAoeF-00039j-KE@ori.kusastro.kyoto-u.ac.jp>
References: <E1bAoeF-00039j-KE@ori.kusastro.kyoto-u.ac.jp>
Message-ID: <dfd9a99e-ea7d-75a6-dead-096396854474@astro.columbia.edu>


This one could be a very, very interesting star, and is still decently 
available in the northern evening sky.

j

-------- Forwarded Message --------
Subject: [vsnet-alert 19879] ASASSN-16fy
Date: Thu, 09 Jun 2016 10:20:39 +0900
From: Taichi Kato <tkato at kusastro.kyoto-u.ac.jp>
To: variable_star_forum at yahoogroups.com, 
vsnet-alert at ooruri.kusastro.kyoto-u.ac.jp, vsnet-alert at yahoogroups.com, 
vsnet-campaign-dn at ooruri.kusastro.kyoto-u.ac.jp, 
vsnet-newvar at ooruri.kusastro.kyoto-u.ac.jp, 
vsnet-newvar at yahoogroups.com, 
vsnet-outburst at ooruri.kusastro.kyoto-u.ac.jp, vsnet-outburst at yahoogroups.com

ASASSN-16fy

    Observations are strongly encouraged!

ASASSN-16fy 	--- 	------- 	14:2:3.07 	46:13:33.6 	2016-06-7.4 	13.21 
SDSS 	DSS 	VIZIER 	------- 	Bright CV candidate, matches to SDSS g=19.5 
and GALEX, no apparent outbursts in CRTS, V>18.2 on 2016-06-03.41, 
V=13.4 on 2016-06-07.40, V=13.1 on 2016-06-08.40.

ASASSN-16fy 20160603.41 <182V ASN
ASASSN-16fy 20160607.40 134V ASN
ASASSN-16fy 20160608.40 131V ASN


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From jop at astro.columbia.edu  Thu Jun 30 14:38:07 2016
From: jop at astro.columbia.edu (Joe Patterson)
Date: Thu, 30 Jun 2016 14:38:07 -0400
Subject: (cba:news) Fwd: [baavss-alert] UZ Boo
In-Reply-To: <CAOb0a76CAsU5LZ3vUEO7ainvo5affhYHdhMPXbWveXR8Xyt+3g@mail.gmail.com>
References: <CAOb0a76CAsU5LZ3vUEO7ainvo5affhYHdhMPXbWveXR8Xyt+3g@mail.gmail.com>
Message-ID: <b3123f41-43af-6af3-4ebb-77067ea34362@astro.columbia.edu>

Hi CBAers,

Late in the season for Boo, but very much worth covering, if indeed it 
stays bright... and especially if we can get European coverage too. 
Despite those "white nights".

joe p


-------- Forwarded Message --------
Subject: 	[baavss-alert] UZ Boo
Date: 	Thu, 30 Jun 2016 18:25:37 +0100
From: 	Gary Poyner garypoyner at gmail.com [baavss-alert] 
<baavss-alert at yahoogroups.com>
Reply-To: 	baavss-alert at yahoogroups.com
To: 	Baavss Alert <baavss-alert at yahoogroups.com>



I've just noted on an AAVSO News Flash that the Recurrent Object UZ Boo 
is in outburst at 13.3.

Might someone be able to confirm please? (no chance here - weather) 
It's quite an important and interesting detection if real.

Thanks and good luck,

Gary


-- 
------------------------------------------------------
Gary Poyner FRAS
garypoyner at gmail.com <mailto:garypoyner at gmail.com>
www.variablestars.co.uk <http://www.variablestars.co.uk/>

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