From jop at astro.columbia.edu  Sun Sep  5 05:05:02 2010
From: jop at astro.columbia.edu (Joe Patterson)
Date: Sun, 05 Sep 2010 05:05:02 -0400
Subject: (cba:news) OT_J234440.5-001206  = new Catalina transient
Message-ID: <4C835D3E.6030507@astro.columbia.edu>

Another little cutie in this great survey's net. Pretty large outburst 
amplitude (6.5 mag).  Gianluca reports superhumps.  Transiting near 
midnight.  Equatorial.  Our proverbial cup of tea.  Go for it!

You can find a chart on the CRTS survey page, under "MLS bright CVs". 
The double star points to the transient!

joe

BTW Lanning 420 appears to be finished - too faint.  Nice new SU UMa, I 
guess.  Just to remind, this is a good time to resume our study of 
OT2138+26, the Pegasus transient of the springtime - now in 
quiescence... and definitely a good time to study IGR0023+61 (Cas), 
which is now pulsing with a strangely much higher amplitude.



-------- Original Message --------
Subject: [vsnet-outburst 11501] Re: [vsnet-alert 12140] 
OT_J234440.5-001206  = MLS transient
Date: Sun, 05 Sep 2010 04:31:59 +0200
From: Gianluca Masi <gianluca at bellatrixobservatory.org>
To: Taichi Kato <tkato at kusastro.kyoto-u.ac.jp>
CC: vsnet-alert at ooruri.kusastro.kyoto-u.ac.jp, 
vsnet-outburst at ooruri.kusastro.kyoto-u.ac.jp, 
vsnet-outburst at yahoogroups.com, vsnet-newvar at yahoogroups.com, 
variable_star_forum at yahoogroups.com, 
vsnet-campaign-dn at ooruri.kusastro.kyoto-u.ac.jp, 
vsnet-alert at yahoogroups.com,	vsnet-newvar at ooruri.kusastro.kyoto-u.ac.jp

Dear Colleagues,

as soon as I received this alert, I slewed my robotic system to this
transient, starting time resolved photometry.

After 1.6 hours, I see a clear evidence of superhumps, with an amplitude
of 0.3 mags and a period around 2 hours (estimated by eye!).

So, this star seems to be a SU UMa star.

Regards,
Gianluca

Taichi Kato ha scritto:
> OT_J234440.5-001206 = MLS transient
>
>    Forwarded message:
>    (The CRTS event identifier is MLS100904:234441-001206)
>
> From: Patrick Wils <patrickwils at yahoo.com>
> Subject: [cvnet-outburst] Mount Lemmon CRTS Transient
>
> The Mount Lemmon CRTS survey found a relatively bright transient at mag 14.3, position 23 44 40.54 -00 12 05.8.  It is mag 21 in its faint state according to SDSS, 20-20.5 according to CRTS.  This is very likely a previously unknown dwarf nova.  Details can be found here: <http://www.skyalert.org/events/15318/>.
>
> Patrick
>
>
> __________ Informazione NOD32 5423 (20100904) __________
>
> Questo messaggio  ?stato controllato dal Sistema Antivirus NOD32
> http://www.nod32.it
>
>
>



From jop at astro.columbia.edu  Thu Sep 30 16:28:52 2010
From: jop at astro.columbia.edu (Joe Patterson)
Date: Thu, 30 Sep 2010 16:28:52 -0400
Subject: (cba:news) Stars for October
Message-ID: <4CA4F304.2070802@astro.columbia.edu>

Dear CBAers,

Thanks for all the great data you've been sending!  V709 Cas and IGR 
0023+61 are being well-covered - especially from Enrique, Bob Koff, and 
Jim Jones.  I reckon these can be put aside until late in the season.
(V709 Cas, by the way, pulses primarily at its first harmonic - at 552 
c/d - and hence requires pretty fast integrations.)

Many of you jumped promptly on the superoutburst of SDSS0804+51.  And 
rightly so!  Rotten sky position, but with data from Europe (Arto and 
Enrique) and the USA (Bob Kogg, Tut and George), we're managing to track 
its beautiful wave pretty well.  It's likely to be a very important 
star, a very old binary with a greatly whittled-down secondary - and the 
measure of the period is the clue needed to learn the mass.  It might 
have another 2 weeks or so of visibility in our scopes - let's keep 
leaning on it till the photons are gone.

I don't want to sound greedy... but I am.  I had hoped to get some early 
season data on RX0636+35 ("Aur") and RX0704+26 ("Gem").  So far, no 
takers: I think the glamor of sdss0804 blew my request away.  But it 
would be great to get some pulse timings of these stars - and I have 
*immediate" use for Mister Gem, because I have a long-term pulse timing 
study ready to ship out the door (but would be enhanced by 2010 data, 
since it would test the candidate long-term ephemeris).  Gem has a 480 s 
period, but most of the power is at 240 s; and the amplitude is so high 
that your light curves may look funny, as if there some new noise in the 
CCD.  (Fast integrations will reassure you on this.)

And as for late season DQ Her stars, I'd love to see something on 
RX1654-19.  Probably too late, but I thought I'd try.

For the best northern stars for quite long time series, I nominate 
XSS0056+46 and V455 And.  In the south, BW Scl (for sure)... and maybe 
(getting ambitious here) RX0232-37 and RX0354-16.  The latter two are 
faint and kind of mysterious, and hence long shots - but worth getting 
to know.

For those thinking ahead, we will probably have a CBA meeting coincident 
with the AAS meeting in Boston - and with the AAVSO meeting.  Nominally 
May 21-26, 2011.  This would mean skipping the Big Bear meeting. 
Opinions on that?  My guess is that CBAers would prefer the AAS+AAVSO 
setting... but the costs of Boston and the AAS are a problem.

joe