From jop at astro.columbia.edu Mon Aug 24 10:11:27 2009 From: jop at astro.columbia.edu (Joe Patterson) Date: Mon, 24 Aug 2009 10:11:27 -0400 Subject: (cba:news) BW Scl and V455 And, mainly Message-ID: <4A929F8F.9060506@astro.columbia.edu> Dear CBAers, The dwarf novae of mid-August have dropped off the radar. We managed to track some of 'em (1610+09 and 2230-14), while others (2100+00) were just too faint. Wipe 'em out. The prime southern object for the next few weeks should be BW Scl = RX2353-38. This object is about V=16.5, but it has large-amplitude signals at the orbital and one other frequency (of unknown origin)... plus a superhump signal that pops up every so often, not associated with any outburst. In fact, no outburst has ever been observed from this star. It is one of the burned-out CVs which has been a major topic of research in recent years - sometimes called the WZ Sagittae stars. We manage to do very well with this star - make it a regular feature of your August and September nights! In the north, the bookended star is V455 And = HS2331+39. Practically everything I just wrote applies to this star also! Except that one outburst finally did occur, in 2007. It's now just a tad above quiescence at 16.5, but has some very strong periodic signals, and will greatly reward your time. We expect to have some time also at professional telescopes (SAAO and KPNO) during the next week on both stars, so that will boost the value of the global coverage. The DQ Her stars remain valuable, except V1223 Sgr, which has had enough coverage to pin down the period change. Especially RX1803+40=Her, RX0022+61=IGR0023+61=Cas... and AO Psc and FO Aqr as the easy bright targets. The latter two are the ideal targets for people starting out in this enterprise (of which we have several this month). Finally, a meetings reminder. We'll meet again in Big Bear along with SAS (the astro club, not the airline) in late May 2010. It's possible we'll have a small session of our own, so people can give talks about their own setup - not just the big more scientifically oriented talks which are the main element of the meeting. In addition, there's a AAS meeting in Boston in late May 2011, where there's likely to be a pro-am research section where we - and more importantly, individual CBAers - could play a role and meet each other. In both cases, I promise to organize some social functions outside the confines of the meeting (and not just golf). Happy observing! joe From jop at astro.columbia.edu Wed Aug 26 12:24:33 2009 From: jop at astro.columbia.edu (Joe Patterson) Date: Wed, 26 Aug 2009 12:24:33 -0400 Subject: (cba:news) V455 And and HS2219+1824 Message-ID: <4A9561C1.3060801@astro.columbia.edu> Further to Bob and Etienne's cba-chat... V455 And has periodic signals on timescales from 34 s to 3.5 hours. Most of them are reliable, others wander a bit... and except for the orbital period, I'd say they are all still of unknown origin. (In fact, I don't think Porb is 100.00% nailed either - but awfully close.) A few CBAers might be able to resolve that fast period, but most should probably settle for the 30-60 s time resolution that this magnitude (16) probably permits. That will bring everything into play except the fast signal; we'll try to resolve the latter with some bigger-scope data. Just a touch earlier in the night, it's time to jump on HS2219+1824... which Gianluca Masi has found to be flashing waves that look awfully like superhumps. This one won't be with us long! joe From jop at astro.columbia.edu Thu Aug 27 23:34:11 2009 From: jop at astro.columbia.edu (Joe Patterson) Date: Thu, 27 Aug 2009 23:34:11 -0400 Subject: (cba:news) V336 Per? Message-ID: <4A975033.4000606@astro.columbia.edu> This one could be interesting... definitely enough to look for waves in the light curve. If the star declines fast, well, then it's probably not a super. Chart in Downes et al. joe -------- Original Message -------- Subject: RE: [cvnet-outburst] V336 Per Date: Thu, 27 Aug 2009 23:40:46 +0000 From: Jeremy Shears Reply-To: cvnet-outburst at yahoogroups.com To: , References: Sorry this should be 15.2C > To: baavss-alert at yahoogroups.com; cvnet-outburst at yahoogroups.com > From: bunburyobservatory at hotmail.com > Date: Thu, 27 Aug 2009 23:30:02 +0000 > Subject: [cvnet-outburst] V336 Per > > > The ROP star V336 Per appears to be in outburst: > > > > Aug 27.971 14.2C > > > > Jeremy Shears > > Cheshire, UK > > _________________________________________________________________ > Windows Live Messenger: Happy 10-Year Anniversary?get free winks and emoticons. > http://clk.atdmt.com/UKM/go/157562755/direct/01/ > > [Non-text portions of this message have been removed] > > > > ------------------------------------ > > Visit us on the web at http://cvnet.aavso.org > Yahoo! Groups Links > > > _________________________________________________________________ Upgrade to Internet Explorer 8 Optimised for MSN. http://extras.uk.msn.com/internet-explorer-8/?ocid=T010MSN07A0716U [Non-text portions of this message have been removed] ------------------------------------ Visit us on the web at http://cvnet.aavso.org Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/cvnet-outburst/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/cvnet-outburst/join (Yahoo! ID required) <*> To change settings via email: mailto:cvnet-outburst-digest at yahoogroups.com mailto:cvnet-outburst-fullfeatured at yahoogroups.com <*> To unsubscribe from this group, send an email to: cvnet-outburst-unsubscribe at yahoogroups.com <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/ From jop at astro.columbia.edu Thu Aug 27 23:53:36 2009 From: jop at astro.columbia.edu (Joe Patterson) Date: Thu, 27 Aug 2009 23:53:36 -0400 Subject: (cba:news) LD317 low state Message-ID: <4A9754C0.6040502@astro.columbia.edu> John Thorstensen reports that this novalike has dived into a low state. There have no studies (that I know of) of this star in a low state - in fact I didn't even know it had very low states. Anyway, it's pretty well placed for observation - it's 2344+43, or "And" in Downes et al. I dunno yet how bright it is - maybe too faint. It's not likely to be photometrically active; but photometry of VY Scl's at minimum is quite scarce... and it's worth a peek. joe From jop at astro.columbia.edu Fri Aug 28 18:38:34 2009 From: jop at astro.columbia.edu (Joe Patterson) Date: Fri, 28 Aug 2009 18:38:34 -0400 Subject: (cba:news) V713 Cep in outburst Message-ID: <4A985C6A.5000303@astro.columbia.edu> Wow! An eruption of V713 Cep. We've been waiting for this one! We have a lot of detailed photometry at quiescence, spectroscopy thanks to John Thorstensen who observed it just three nights ago... and are just waiting for the superoutburst to complete the triad. This could be the one - and it's extremely well placed in the northern sky. Sorry for all the cries of "the sky is falling"... but if it's actually a super, time to spring into action! joe -------- Original Message -------- Subject: Re: [cvnet-outburst] V713 Cep Date: Fri, 28 Aug 2009 22:47:36 +0200 From: Jochen Pietz Reply-To: cvnet-outburst at yahoogroups.com To: cvnet-outburst at yahoogroups.com References: <671ABF5C06DB4B4ABFC863994C752482 at ownerPC> V713 Cep 2009-08-28.795 15.1C and a "historical" V336 Per outburst http://home.arcor.de/j.pietz/img/v336_per_20020129b.jpg http://home.arcor.de/j.pietz/img/v336_per_aladin.jpg V336 Per 2002-01-12.849 <15.7 V336 Per 2002-01-28.918 15.3 V336 Per 2002-01-31.847 15.9 V336 Per 2002-02-16.804 <15.7 Regards, Jochen __._,_.___ Messages in this topic (2) Reply (via web post) | Start a new topic Messages | Photos | Members Visit us on the web at http://cvnet.aavso.org MARKETPLACE Mom Power: Discover the community of moms doing more for their families, for the world and for each other Yahoo! 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