From jop at astro.columbia.edu  Tue Jan  1 08:11:59 2008
From: jop at astro.columbia.edu (Joe Patterson)
Date: Tue, 01 Jan 2008 08:11:59 -0500
Subject: (cba:news) VZ Sex = RX 0944+03 in outburst
Message-ID: <477A3C1F.4090401@astro.columbia.edu>


Dear CBAers,

This looked pretty interesting.  The eruption might be very brief, if 
the star is indeed (as presently classified) a DQ Her star.  But even if 
it is, the amplitude of the (alleged) spin signal at 36 minutes is of 
very great interest.

And you gotta love that brightness, at 12.4.  Even if it has declined a 
lot, this is a VERY good target for the next few days at least.  There's 
basically no coverage yet of any eruption.  Suitable for all scopes and 
all latitudes.

joe



-------- Original Message --------
Subject: 	[cvnet-outburst] VZ Sex in outburst
Date: 	Tue, 1 Jan 2008 13:03:32 +0100
From: 	Eddy Muyllaert <eddy.muyllaert1 at pandora.be>
Reply-To: 	cvnet-outburst at yahoogroups.com
To: 	<cvnet-outburst at yahoogroups.com>



Hi all,

According to Carlo Gualdoni (GCO) VZ Sex is in a bright outburst :

VZ SEX 2454465.6202 DEC 31.1202 12.4 KY GCO

Happy, clear but above all a healthy 2008 to all observers around the world.

Best wishes,
Eddy Muyllaert (MUY)
Oostende
Belgium
eddy.muyllaert1 at pandora.be <mailto:eddy.muyllaert1%40pandora.be>




From jop at astro.columbia.edu  Wed Jan  2 19:44:33 2008
From: jop at astro.columbia.edu (Joe Patterson)
Date: Wed, 02 Jan 2008 19:44:33 -0500
Subject: (cba:news) chart and info re Swift 0732-13
Message-ID: <477C2FF1.6010400@astro.columbia.edu>


Some of you asked about this one.  Here's coords, charts, spectrum, 
p.s., etc.  Nice target, but don't forget the new arrivals up there - FQ 
Mon and VZ Sex.

joe


-------- Original Message --------
Subject: (cba:news) Swift J0732.5-1331
Date: Mon, 13 Feb 2006 21:02:40 -0500 (EST)
From: Joe Patterson <jop at astro.columbia.edu>
Reply-To: Joe Patterson <jop at astro.columbia.edu>
To: <cba-news at cbastro.org>



Dear CBAers,

The full moon has clobbered many of our choicer targets... but
here's a new one which promises to be very interesting, can survive a
little moonlight, and is decently equatorial.  It's a Swift X-ray
source - a quite hard X-ray source, which strongly suggests that it's
a magnetic CV.  For proof, though, that's where you come in!

So let's go after this star with all hemispheres and as many telescopes
as possible.  The ASAS dwarf novae have I think run their course
(ASAS0233 and 1025) - time to close 'em up and turn to fresh targets!

~10" away from
a much brighter star, so be careful with the data analysis:

http://www.astro.columbia.edu/~jules/SwiftJ0732.5-1331/

07 32 37.6
-13 31 09.0

It's a USNO-B1 star


joe



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https://cbastro.org/communications/mailing-lists/


From jop at astro.columbia.edu  Mon Jan 21 22:55:07 2008
From: jop at astro.columbia.edu (Joe Patterson)
Date: Mon, 21 Jan 2008 22:55:07 -0500
Subject: (cba:news) New outbursting dwarf novae - battle stations
Message-ID: <4795691B.9070503@astro.columbia.edu>

Dear CBAers,

Two new outbursting dwarf novae in the last 2 days - both with excellent 
prospects for being the short-period WZ Sge-type which have been so good 
to us... and both superbly placed in the sky for all hemispheres.

The first is the one attached, a dwarf nova in Canis Minor (0747+06), 
and a few minutes ago large-amplitude superhumps were first reported.
Fire away!  I believe mag 12.5 tonight.  I think Tom Krajci is setting 
up on it right now.

The second is OT084555.1+033930, also excellently placed, as you can see 
from the position.  Also about mag 13 I think.

And the third star which should share center stage to some extent is
OT111217.4-353829, a star which Greg Bolt covered thoroughly for the 
first few weeks of outburst.  It's still bright and quite possibly still 
superhumping.  Almost certainly an EXTREMELY INTERESTING star... and now
better placed for observing.

I'll forward a few messages which might be of interest in learning about 
these targets... although VERY LITTLE is known about 'em yet (this is 
the "discovery eruption" for each one of these stars).

These stars deserve first priority in our pantheon.  It's not that "all 
the children are above average"... they really are likely to be great 
winners!

joe

-------- Original Message --------
Subject: CBET 1216: 20080120 : DWARF NOVA IN CANIS MINORIS
Date: Sun, 20 Jan 2008 16:03:05 -0500 (EST)
From: IAUC mailing list <quai at cfa.harvard.edu>
To: iauc at libraries.cul.columbia.edu

                                                   Electronic Telegram 
No. 1216
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS at CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT at CFA.HARVARD.EDU (science)
URL http://www.cfa.harvard.edu/iau/cbat.html


DWARF NOVA IN CANIS MINORIS
      H. Yamaoka, Kyushu University, reports that K. Itagaki (Yamagata, 
Japan)
has discovered a variable star (mag 12.3) on unfiltered CCD images obtained
with a 0.21-m reflector on Jan. 19.546 UT, the "new" object located at R.A.
= 7h47m27s.64, Decl. = +6o50'50".0 (equinox 2000.0; photometry and 
astrometry
apparently measured from an image obtained with a 0.30-m reflector). 
Nothing
is visible at this position on Itagaki's image from 2007 Oct. 17 (limiting
mag 17.5), though a faint star of mag about 19.5 is within 1" of this
position in both the USNO-B1.0 and GSC 2.3.2 catalogues.  H. Naito and S.
Narusawa, Nishi-Harima Astronomical Observatory (NHAO), report (via Yamaoka)
that a low-resolution (R about 270) spectrum (range 410-670 nm), taken on
Jan. 19.63 UT with 2.0-m NAYUTA telescope at NHAO under hazy conditions,
shows a smooth, blue continuum with absorption lines of the Balmer series,
which indicates that the new variable is a dwarf nova in outburst; the
equivalent widths of H_beta and H_gamma are 0.6 and 0.7 nm.


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
       superseded by text appearing later in the printed IAU Circulars.

                          (C) Copyright 2008 CBAT
2008 January 20                  (CBET 1216)              Daniel W. E. Green
_______________________________________________
iauc mailing list
iauc at astro.columbia.edu
https://mail.astro.columbia.edu/mailman/listinfo/iauc



From jop at astro.columbia.edu  Mon Jan 21 22:58:00 2008
From: jop at astro.columbia.edu (Joe Patterson)
Date: Mon, 21 Jan 2008 22:58:00 -0500
Subject: (cba:news) new CV in Hya
Message-ID: <479569C8.6030702@astro.columbia.edu>

Here's the info on the guy in hya. 13.5 last night...

joe

-------- Original Message --------
Subject: [vsnet-outburst 8461] New CV? in Hya (OT_084555.1+033930)
Date: Sun, 20 Jan 2008 12:50:12 +0900
From: Taichi Kato <tkato at kusastro.kyoto-u.ac.jp>
To: suuma at yahoogroups.com, 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, wzsge at yahoogroups.com

   Again, there is another new variable star in Hya announced at the site
of "CBAT Unconfirmed Observations Page".
(http://www.cfa.harvard.edu/iau/unconf/cbat_unconf.html)

084555.08 +033929.7 mag 13.3

   If this is real, the amplitude again suggests a large-amplitude
dwarf nova.  No ROSAT source is present.  No previous ASAS detection.
Use OT_084555.1+033930 for a temporary designation.






From jop at astro.columbia.edu  Fri Jan 25 14:54:46 2008
From: jop at astro.columbia.edu (Joe Patterson)
Date: Fri, 25 Jan 2008 14:54:46 -0500
Subject: (cba:news) [Fwd: CBET 1225: 20080125 : POSSIBLE DWARF NOVA IN HYDRA]
Message-ID: <479A3E86.9020507@astro.columbia.edu>

Here's the CBET message on the "other" dwarf nova - the *candidate* 
dwarf nova in hydra.  Like the certain (because of the just-discovered 
superhumps) dwarf nova freshly found in Canis Minor, it's a WZ Sge 
candidate because of the large amplitude... This makes it of great 
interest to us.

Can someone post a chart of it to cba-news?  Some CBAers are having 
trouble identifying it... and sitting here in New York City, I'm not the 
best qualified to do it!

joe

-------- Original Message --------
Subject: CBET 1225: 20080125 : POSSIBLE DWARF NOVA IN HYDRA
Date: Fri, 25 Jan 2008 12:03:09 -0500 (EST)
From: IAUC mailing list <quai at cfa.harvard.edu>
To: iauc at libraries.cul.columbia.edu

                                                   Electronic Telegram 
No. 1225
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS at CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT at CFA.HARVARD.EDU (science)
URL http://www.cfa.harvard.edu/iau/cbat.html


POSSIBLE DWARF NOVA IN HYDRA
      H. Yamaoka, Kyushu University, reports that K. Itagaki (Yamagata, 
Japan)
has discovered a variable star (mag 13.3) on unfiltered CCD images obtained
with a 0.21-m reflector on Jan. 19.592 UT, the "new" object located at R.A.
= 8h45m55s.08, Decl. = +3o39'29".7 (equinox 2000.0; photometry and 
astrometry
apparently measured from an image obtained with a 0.30-m reflector). 
Nothing
is visible at this position on an image taken by Itagaki on 2007 Oct. 17
(limiting mag 17.5).  An image on Jan. 25.516 by Itagaki shows that the star
had faded to mag about 14.2.  The USNO-B1.0 and GSC 2.3.2 catalogues 
contain a
faint (mag about 20.0) star within 1" of the reported position.  H. Maehara,
Kyoto University, reports (via VSNET) that this variable star shows a
small-amplitude (about 0.1 mag) modulation.  A. Henden, AAVSO, notes (AAVSO
Special Notice 94) that the star is likely to be a WZ Sge-subclass variable.


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
       superseded by text appearing later in the printed IAU Circulars.

                          (C) Copyright 2008 CBAT
2008 January 25                  (CBET 1225)              Daniel W. E. Green
_______________________________________________
iauc mailing list
iauc at astro.columbia.edu
https://mail.astro.columbia.edu/mailman/listinfo/iauc



From jop at astro.columbia.edu  Fri Jan 25 16:17:58 2008
From: jop at astro.columbia.edu (Joe Patterson)
Date: Fri, 25 Jan 2008 16:17:58 -0500
Subject: (cba:news) [Fwd: Re: (cba:chat) [Fwd: CBET 1225: 20080125 :
 POSSIBLE DWARF NOVA IN HYDRA]]
Message-ID: <479A5206.6090506@astro.columbia.edu>

Thanks, Arne and Mike.  I dunno if this star will prove to be a winner - 
but at least you can find it now!

BTW, apologies for Olde Whiteface up there.  Sitting in my office, it's 
pretty easy to overlook how thoroughly our targets are getting clobbered 
by the Moon.

joe

-------- Original Message --------
Subject: Re: (cba:chat) (cba:news) [Fwd: CBET 1225: 20080125 : POSSIBLE 
  DWARF NOVA IN HYDRA]
Date: Fri, 25 Jan 2008 14:36:32 -0600
From: Michael Koppelman <lolife at bitstream.net>
Reply-To: cba-chat at cbastro.org
To: cba-chat at cbastro.org
References: <479A3E86.9020507 at astro.columbia.edu> 
<479A404E.7000307 at aavso.org>

The correct URL is:

http://www.aavso.org/observing/charts/vsp/

M.


On Jan 25, 2008, at 2:02 PM, arne wrote:

> You can get it through the AAVSO VSP.  Enter
> VSX J084555.0+033929
>
> and you will get a chart.  (http://www.aavso.org/charts/vsp/)


____________________________________________________________ 

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https://cbastro.org/communications/mailing-lists/ 




From jop at astro.columbia.edu  Sun Jan 27 20:38:00 2008
From: jop at astro.columbia.edu (Joe Patterson)
Date: Sun, 27 Jan 2008 20:38:00 -0500
Subject: (cba:news) choosing your optical transient...
Message-ID: <479D31F8.2090809@astro.columbia.edu>


Dear CBAers,

I've analyzed all the data so far on ot0747, and ot0845.  The former 
looks to be very well behaved, with a constant period at Psh=0.06073(8) 
d.  Seems to be under control!  I'll send the full lot of data to all 
the observers.

OT0845 is another story.  This now has strong superhumps, but they 
probably *just* emerged, and the star is a bit fainter at 15.  So our 
data on it is very sparse - not enough to really parse the period(s). So 
if you can get comfortably to 15.5 or so, OT0845 is definitely the 
better choice.

joe


From jop at astro.columbia.edu  Thu Jan 31 05:28:00 2008
From: jop at astro.columbia.edu (Joe Patterson)
Date: Thu, 31 Jan 2008 05:28:00 -0500
Subject: (cba:news) Tonny's 1-cycle dwarf nova
Message-ID: <47A1A2B0.6080801@astro.columbia.edu>

Dear CBAers,

Please take note of this guy.  The light curve definitely suggests a 
superhump, but the sky position is so awkward that the period will be 
very tough to nail unless we can get round-the-world coverage.  If you 
have a clear evening sky, see if you can squeeze out a short time-series 
(the longer the better, of course).

Borealites only, of course.  By the way, on the other side of the night, 
it's AM CVn season again.  I've written a short paper on the orbital 
period change in AM CVn; all it needs is one more seasonal timing in 
February 2008, and it's complete.  That would be YOUR timing!

Happy observing!  I'm sure I don't need to tell you, but there's a 
beautiful conjunction of Venus and Jupiter in the predawn sky this week. 
Gorgeous sight even from the Big Apple.

joe

-------- Original Message --------
Subject: 	[cvnet-outburst] Optical transient OT_J021110.2+171624 is most
likely a new UGSU-type dwarf nova
Date: 	Thu, 31 Jan 2008 00:29:12 +0100
From: 	Tonny Vanmunster <Tonny.Vanmunster at cbabelgium.com>
Reply-To: 	cvnet-outburst at yahoogroups.com
Organization: 	CBA
To: 	<aavso-photometry at mira.aavso.org>,
<cvnet-discussion at yahoogroups.com>, "'CVnet outburst'"
<cvnet-outburst at yahoogroups.com>
CC: 	Cba-Chat <cba-chat at cbastro.org>, cba-news
<cba-news at cbastro.org>



Dear colleagues,

Earlier today, Patrick Wils announced (on cvnet-discussion) the detection by
the Catalina Sky Survey of an optical transient (mag 14.3) on Jan 29th, that
was suspected to be an outburst of USNO-B1.0 1072-0031053 (position RA =
02:11:10.19, Decl = +17:16:24.4, J2000.0), a star which is normally R=19.2.
Patrick furthermore reported that object appeared bright on 2 out of 9
POSSII images.

Following Patrick's announcement, I started unfiltered CCD time-series
observations of the new OT at CBA Belgium Observatory on Jan 30.833 UT,
2008, using a 0.35-m f/6.3 telescope and ST-7XME CCD camera. Sky conditions
were good, and the session lasted for 2 hours. The resulting light curve is
presented at my website (www.cbabelgium.com) and shows a superhump-like
structure with an amplitude of 0.15 mag. Given the short duration of the
session, it's difficult to accurately establish the hump period. Using
Peranso's implementation of the ANOVA method, I find a value of 0.063 +/-
0.009 d. The ANOVA period window and phase diagram for P = 0.063d are
presented as well.

Follow-up CCD and spectroscopic observations are highly needed to further
study the lightcurve characteristics of this dwarf nova and to firmly secure
its UGSU nature.

Tonny Vanmunster
CBA Belgium Observatory
http://www.cbabelgium.com <http://www.cbabelgium.com>

PERANSO : The Light Curve and Period Analysis Software
http://www.peranso.com <http://www.peranso.com>

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