From jop at astro.columbia.edu Tue Jun 3 07:07:03 2003 From: jop at astro.columbia.edu (Joe Patterson) Date: Tue, 3 Jun 2003 07:07:03 -0400 (EDT) Subject: (cba:news) GO Com and Lib 3 Message-ID: Dear CBAers, Christopher Jones reported the dwarf nova GO Com in bright outburst, near 13th magnitude. It has only been up a day (certifiably, that is) - not quite enough to establish credentials as a supermax. But the brightness level suggests supermax, and this makes the star a superb candidate for time-series photometry. Because of the rarity of its outbursts, GO Com has long attracted interest as a WZ Sge star - but no one has managed to get good coverage of it at max (or for that matter, min). The field is very sparse, as usual in Coma. Report comparison stars with care, and try not to make them too distant! We hope for maybe a week of coverage before the Moon probably ends the fun. Speaking of fun, Lib 3 isn't providing much. Is this actually a CV? I'm not so sure. We'll force John Thorstensen to take some spectra in 2 weeks and tell us... but for now let's not invest any more in it. Sorry for the (probably) bum steer. And it's a good time to start up again on EX Hya. I've been analyzing this year's data and found some effects which, despite all these years of study, seem to be new. A coupla more weeks would be great. V4743 Sgr (or V1494 Aql) would be nice second targets of those southern nights! joe From jop at astro.columbia.edu Thu Jun 5 10:39:34 2003 From: jop at astro.columbia.edu (Joe Patterson) Date: Thu, 5 Jun 2003 10:39:34 -0400 (EDT) Subject: (cba:news) GO Com and V803 Cen Message-ID: Dear CBAers, A day ago Patrick Schmeer reported that GO Com jumped back into outburst, and Major Tom found beautiful, freshly formed superhumps in the light curve. (Data attached) So this is definitely the prime target for these northern June evenings! I imagine it'll stay decently bright for a coupla weeks, enough time to get precise measures of Psh and Porb (assuming that one of the "orbital sidebands" shows up. Go Com go! And just for symmetry, Rod Stubbings promptly reported V803 Cen back at mag 12.6. This *usually* means a supermax, although they are quite short-lived in V803 Cen. We have managed to cover a couple of supermaxima in this helium star, though never so thoroughly as to yield the harvest of information commonly available in the H-rich dwarf novae. It's pretty good seasonal timing... so this is now the prime southern evening target. With V4743 Sgr and V1494 Aql the best follow-ons. joe From jop at astro.columbia.edu Thu Jun 19 20:07:31 2003 From: jop at astro.columbia.edu (Joe Patterson) Date: Thu, 19 Jun 2003 20:07:31 -0400 (EDT) Subject: (cba:news) Stars for the Solstice Message-ID: Dear CBAers, I'm starting to pack up to go back to NYC now. It's only 60 miles, but for any move to or from New York, tack on an extra 2000 for aggravation. Anyway, sorry, that's why communications have been a bit slow lately. Another aggravation is that 2003 is proposal-writing year. Every third year I need to spend a lot of time on proposals for continued CBA funding. Mostly they have been successful, but it's always subject to the whims of just who happens to be on the selection committee in a particular year. You might think it would be people known for their Solomonesque wisdom... but the reality is much closer to a random selection of astronomers not feeling particularly busy when that phone call or email arrives. So it's a time of anxiety for people writing the damn proposals; you have to accept a large chance component in the outcome. Sort of like swinging at a good knuckleball (for baseball fans). And funding in the U.S. is really a necessity, I'm afraid. It costs ~$15000/year just for "page charges" alone. The reason I bother you with this stuff is that it is helpful for us to have the label "CBA" out there associated with the results that come out of our enterprise. So as you disseminate your work around the planet, consider using that label, if you don't find it too awkward or embarrassing. In the long run, it does raise visibility and credibility, and improves our prospects for long-term existence (funding)... although of course it's no big deal in any particular case. On to stars. V803 Cen has been having a great outburst and post-outburst. The coverage is a touch less than in 1997 and 2000, but on the other hand this year's coverage started right as the SO started, unlike the others. Long runs by Bob Rea, Berto, Greg Bolt, Neil Butterworth, and Bill Allen have been filling CBA coffers. Keep up the vigil! OU Vir has long disappeared below the radar (except for the 1.3 m), and GO Com has gotten faint too. We'll track it with the 1.3 m, but I think it's really gone for the CBAers (correct me if I'm wrong - how bright is it now?). The star I recommend most highly now is V1494 Aql. It has pronounced dips every 3.2 hours, and other variations on a similar timescale that may be superhumps (or something like it). It's nearly an all-night object for the north, and a good second-half object for the south. About 15th magnitude. However, V603 Aql is quite timely too, for basically the same reasons, only it is 3.5 mag brighter, and you can expect to get much better data. This should really be the start of a 2-month campaign on V603 Aql - just invite it into your life for the most of the summer/winter. You can flirt with both for a while, but eventually I recommend you adopt V1494 or V603 as your main man. The people who like order will be drawn to V1494, while V603's the choice if you kinda like those light curves on the wild side. I think you've suffered enough with MV Lyrae. I'll write more on it later, but... it's just too wild for any of us I think (except maybe Elena Pavlenko, who does awfully well with it). Very simple list for early summer/winter! joe From jop at astro.columbia.edu Wed Jun 25 18:51:31 2003 From: jop at astro.columbia.edu (Joe Patterson) Date: Wed, 25 Jun 2003 18:51:31 -0400 (EDT) Subject: (cba:news) stars, comin' 'n goin' Message-ID: Dear CBAers, Well, the V1494 Aql campaign has been going very well, with some of the usual suspects chipping in: Rea, Krajci, Starkey, MDM. Aside from a little flickering, there's just the one period present, presumably orbital. As Retter-Bos-Novak (from memory) mentioned a couple years ago, the sharp component of this signal looks like a true eclipse. The period from 2000-2003 is 0.1346667(2) d. The waveforms of the sharp eclipse and of the slow variation change somewhat from year to year, and it will be fascinating to follow this progressive change as the star gradually fades back to quiescence. It's a done deal. Wrapped up till next year. I will try to attach the mean light curves from 2000, 2001, and 2003 (2002 is also in hand but is somewhat corrupted). If they don't attach here, I'll put 'em in the next message. Good time to start the year's coverage on V1223 Sgr - and also on its friends AO Psc and FO Aqr in the morning sky. Let's make it a good year for DQ Her stars. V603 Aql is still perched on the celestial equator, and everyone can get good runs on it. It's really ideal for very long CBA runs, yet we've never quite got them for some reason. It'll be around a while, but don't forget it... I hope to send another message tomorrow... joe -------------- next part -------------- 0 -4.586184E-02 .01 -4.401344E-02 .02 -3.664582E-02 .03 -2.967612E-02 .04 -4.338138E-02 .05 -3.162528E-02 .06 -2.716587E-02 .07 -3.036489E-02 .08 -1.414643E-02 9.000001E-02 -2.242312E-03 .1 -9.736359E-03 .11 3.696578E-03 .12 5.38457E-03 .13 1.871003E-02 .14 1.328702E-02 .15 1.783583E-02 .16 2.741822E-02 .17 2.719971E-02 .18 .012771 .19 3.433451E-02 .2 2.341614E-02 .21 1.495143E-02 .22 1.828628E-02 .23 2.162612E-02 .24 2.543892E-02 .25 1.483668E-02 .26 1.732704E-02 .27 .0142152 .28 8.221182E-03 .29 2.228233E-02 .3 8.559924E-03 .31 1.523993E-02 .32 4.755661E-03 .33 1.539168E-02 .34 5.147837E-03 .35 -8.370485E-05 .36 9.044962E-03 .37 7.905123E-04 .38 -6.910037E-03 .39 -2.421415E-03 .4 -5.950748E-03 .41 -1.037547E-02 .42 -1.484467E-02 .43 -1.554117E-02 .44 -1.266523E-02 .45 -2.546434E-02 .46 -2.339278E-02 .47 -1.918102E-02 .48 -1.170644E-02 .49 -.0223736 .5 -1.539522E-02 .51 -1.120031E-02 .52 -.0192289 .53 -1.360786E-02 .54 -2.325625E-02 .55 -2.104897E-02 .56 -2.124459E-02 .57 -2.085047E-02 .58 -1.421658E-02 .59 -.0184723 .6 -5.649097E-03 .61 -8.758761E-03 .62 -9.330781E-03 .63 1.305474E-03 .64 1.139793E-03 .65 7.706842E-03 .66 1.307902E-02 .67 1.142917E-02 .68 1.718864E-02 .69 2.675426E-02 .7 2.945506E-02 .71 2.695564E-02 .72 2.629138E-02 .73 2.221083E-02 .74 2.815785E-02 .75 4.682638E-03 .76 1.280034E-02 .77 1.443784E-02 .78 8.764659E-04 .79 6.765202E-03 .8 8.013053E-03 .81 5.783475E-03 .82 -6.426937E-03 .83 2.745958E-03 .84 1.731051E-03 .85 -9.004257E-03 .86 -1.483937E-03 .87 -3.412525E-03 .88 -6.623191E-03 .89 1.183775E-03 .9 -5.740521E-03 .91 -7.484529E-03 .92 -1.186033E-02 .93 -2.721562E-02 .94 -2.363922E-02 .95 -3.415598E-02 .96 -3.626721E-02 .97 -4.911824E-02 .98 -4.511431E-02 .99 -4.345333E-02 1 -4.586184E-02 1.01 -4.401344E-02 1.02 -3.664582E-02 1.03 -2.967612E-02 1.04 -4.338138E-02 1.05 -3.162528E-02 1.06 -2.716587E-02 1.07 -3.036489E-02 1.08 -1.414643E-02 1.09 -2.242312E-03 1.1 -9.736359E-03 1.11 3.696578E-03 1.12 5.38457E-03 1.13 1.871003E-02 1.14 1.328702E-02 1.15 1.783583E-02 1.16 2.741822E-02 1.17 2.719971E-02 1.18 .012771 1.19 3.433451E-02 1.2 2.341614E-02 1.21 1.495143E-02 1.22 1.828628E-02 1.23 2.162612E-02 1.24 2.543892E-02 1.25 1.483668E-02 1.26 1.732704E-02 1.27 .0142152 1.28 8.221182E-03 1.29 2.228233E-02 1.3 8.559924E-03 1.31 1.523993E-02 1.32 4.755661E-03 1.33 1.539168E-02 1.34 5.147837E-03 1.35 -8.370485E-05 1.36 9.044962E-03 1.37 7.905123E-04 1.38 -6.910037E-03 1.39 -2.421415E-03 1.4 -5.950748E-03 1.41 -1.037547E-02 1.42 -1.484467E-02 1.43 -1.554117E-02 1.44 -1.266523E-02 1.45 -2.546434E-02 1.46 -2.339278E-02 1.47 -1.918102E-02 1.48 -1.170644E-02 1.49 -.0223736 1.5 -1.539522E-02 1.51 -1.120031E-02 1.52 -.0192289 1.53 -1.360786E-02 1.54 -2.325625E-02 1.55 -2.104897E-02 1.56 -2.124459E-02 1.57 -2.085047E-02 1.58 -1.421658E-02 1.59 -.0184723 1.6 -5.649097E-03 1.61 -8.758761E-03 1.62 -9.330781E-03 1.63 1.305474E-03 1.64 1.139793E-03 1.65 7.706842E-03 1.66 1.307902E-02 1.67 1.142917E-02 1.68 1.718864E-02 1.69 2.675426E-02 1.7 2.945506E-02 1.71 2.695564E-02 1.72 2.629138E-02 1.73 2.221083E-02 1.74 2.815785E-02 1.75 4.682638E-03 1.76 1.280034E-02 1.77 1.443784E-02 1.78 8.764659E-04 1.79 6.765202E-03 1.8 8.013053E-03 1.81 5.783475E-03 1.82 -6.426937E-03 1.83 2.745958E-03 1.84 1.731051E-03 1.85 -9.004257E-03 1.86 -1.483937E-03 1.87 -3.412525E-03 1.88 -6.623191E-03 1.89 1.183775E-03 1.9 -5.740521E-03 1.91 -7.484529E-03 1.92 -1.186033E-02 1.93 -2.721562E-02 1.94 -2.363922E-02 1.95 -3.415598E-02 1.96 -3.626721E-02 1.97 -4.911824E-02 1.98 -4.511431E-02 1.99 -4.345333E-02  From jop at astro.columbia.edu Wed Jun 25 18:56:24 2003 From: jop at astro.columbia.edu (Joe Patterson) Date: Wed, 25 Jun 2003 18:56:24 -0400 (EDT) Subject: (cba:news) v1494 aql Message-ID: <200306252256.h5PMuOY01495@fidelio.phys.columbia.edu> Well I dunno if that attached. Here are the 3 mean light curves, delta mag versus orbital phase. Pretty interesting waveforms, hey? 2000 data (early season) 0 -4.586184E-02 .01 -4.401344E-02 .02 -3.664582E-02 .03 -2.967612E-02 .04 -4.338138E-02 .05 -3.162528E-02 .06 -2.716587E-02 .07 -3.036489E-02 .08 -1.414643E-02 9.000001E-02 -2.242312E-03 .1 -9.736359E-03 .11 3.696578E-03 .12 5.38457E-03 .13 1.871003E-02 .14 1.328702E-02 .15 1.783583E-02 .16 2.741822E-02 .17 2.719971E-02 .18 .012771 .19 3.433451E-02 .2 2.341614E-02 .21 1.495143E-02 .22 1.828628E-02 .23 2.162612E-02 .24 2.543892E-02 .25 1.483668E-02 .26 1.732704E-02 .27 .0142152 .28 8.221182E-03 .29 2.228233E-02 .3 8.559924E-03 .31 1.523993E-02 .32 4.755661E-03 .33 1.539168E-02 .34 5.147837E-03 .35 -8.370485E-05 .36 9.044962E-03 .37 7.905123E-04 .38 -6.910037E-03 .39 -2.421415E-03 .4 -5.950748E-03 .41 -1.037547E-02 .42 -1.484467E-02 .43 -1.554117E-02 .44 -1.266523E-02 .45 -2.546434E-02 .46 -2.339278E-02 .47 -1.918102E-02 .48 -1.170644E-02 .49 -.0223736 .5 -1.539522E-02 .51 -1.120031E-02 .52 -.0192289 .53 -1.360786E-02 .54 -2.325625E-02 .55 -2.104897E-02 .56 -2.124459E-02 .57 -2.085047E-02 .58 -1.421658E-02 .59 -.0184723 .6 -5.649097E-03 .61 -8.758761E-03 .62 -9.330781E-03 .63 1.305474E-03 .64 1.139793E-03 .65 7.706842E-03 .66 1.307902E-02 .67 1.142917E-02 .68 1.718864E-02 .69 2.675426E-02 .7 2.945506E-02 .71 2.695564E-02 .72 2.629138E-02 .73 2.221083E-02 .74 2.815785E-02 .75 4.682638E-03 .76 1.280034E-02 .77 1.443784E-02 .78 8.764659E-04 .79 6.765202E-03 .8 8.013053E-03 .81 5.783475E-03 .82 -6.426937E-03 .83 2.745958E-03 .84 1.731051E-03 .85 -9.004257E-03 .86 -1.483937E-03 .87 -3.412525E-03 .88 -6.623191E-03 .89 1.183775E-03 .9 -5.740521E-03 .91 -7.484529E-03 .92 -1.186033E-02 .93 -2.721562E-02 .94 -2.363922E-02 .95 -3.415598E-02 .96 -3.626721E-02 .97 -4.911824E-02 .98 -4.511431E-02 .99 -4.345333E-02 1 -4.586184E-02 1.01 -4.401344E-02 1.02 -3.664582E-02 1.03 -2.967612E-02 1.04 -4.338138E-02 1.05 -3.162528E-02 1.06 -2.716587E-02 1.07 -3.036489E-02 1.08 -1.414643E-02 1.09 -2.242312E-03 1.1 -9.736359E-03 1.11 3.696578E-03 1.12 5.38457E-03 1.13 1.871003E-02 1.14 1.328702E-02 1.15 1.783583E-02 1.16 2.741822E-02 1.17 2.719971E-02 1.18 .012771 1.19 3.433451E-02 1.2 2.341614E-02 1.21 1.495143E-02 1.22 1.828628E-02 1.23 2.162612E-02 1.24 2.543892E-02 1.25 1.483668E-02 1.26 1.732704E-02 1.27 .0142152 1.28 8.221182E-03 1.29 2.228233E-02 1.3 8.559924E-03 1.31 1.523993E-02 1.32 4.755661E-03 1.33 1.539168E-02 1.34 5.147837E-03 1.35 -8.370485E-05 1.36 9.044962E-03 1.37 7.905123E-04 1.38 -6.910037E-03 1.39 -2.421415E-03 1.4 -5.950748E-03 1.41 -1.037547E-02 1.42 -1.484467E-02 1.43 -1.554117E-02 1.44 -1.266523E-02 1.45 -2.546434E-02 1.46 -2.339278E-02 1.47 -1.918102E-02 1.48 -1.170644E-02 1.49 -.0223736 1.5 -1.539522E-02 1.51 -1.120031E-02 1.52 -.0192289 1.53 -1.360786E-02 1.54 -2.325625E-02 1.55 -2.104897E-02 1.56 -2.124459E-02 1.57 -2.085047E-02 1.58 -1.421658E-02 1.59 -.0184723 1.6 -5.649097E-03 1.61 -8.758761E-03 1.62 -9.330781E-03 1.63 1.305474E-03 1.64 1.139793E-03 1.65 7.706842E-03 1.66 1.307902E-02 1.67 1.142917E-02 1.68 1.718864E-02 1.69 2.675426E-02 1.7 2.945506E-02 1.71 2.695564E-02 1.72 2.629138E-02 1.73 2.221083E-02 1.74 2.815785E-02 1.75 4.682638E-03 1.76 1.280034E-02 1.77 1.443784E-02 1.78 8.764659E-04 1.79 6.765202E-03 1.8 8.013053E-03 1.81 5.783475E-03 1.82 -6.426937E-03 1.83 2.745958E-03 1.84 1.731051E-03 1.85 -9.004257E-03 1.86 -1.483937E-03 1.87 -3.412525E-03 1.88 -6.623191E-03 1.89 1.183775E-03 1.9 -5.740521E-03 1.91 -7.484529E-03 1.92 -1.186033E-02 1.93 -2.721562E-02 1.94 -2.363922E-02 1.95 -3.415598E-02 1.96 -3.626721E-02 1.97 -4.911824E-02 1.98 -4.511431E-02 1.99 -4.345333E-02  2001 season 0 -2.059734 .01 -2.064457 .02 -2.06297 .03 -2.054712 .04 -2.046733 .05 -2.035467 .06 -1.980517 .07 -1.931134 .08 -1.87303 .09 -1.84492 .1 -1.772535 .11 -1.738243 .12 -1.711076 .13 -1.690061 .14 -1.688661 .15 -1.6564 .16 -1.639048 .17 -1.612875 .18 -1.616515 .19 -1.615182 .2 -1.602292 .21 -1.606361 .22 -1.592886 .23 -1.587961 .24 -1.588667 .25 -1.589106 .26 -1.585278 .27 -1.583061 .28 -1.597594 .29 -1.587 .3 -1.584314 .31 -1.593732 .32 -1.57675 .33 -1.568833 .34 -1.569056 .35 -1.580579 .36 -1.581014 .37 -1.589667 .38 -1.589833 .39 -1.605773 .4 -1.615956 .41 -1.632 .42 -1.6448 .43 -1.6589 .44 -1.66965 .45 -1.673542 .46 -1.689118 .47 -1.670382 .48 -1.6715 .49 -1.6704 .5 -1.661894 .51 -1.659603 .52 -1.662484 .53 -1.6593 .54 -1.649076 .55 -1.651636 .56 -1.637471 .57 -1.642136 .58 -1.622307 .59 -1.611383 .6 -1.599312 .61 -1.582617 .62 -1.567481 .63 -1.5588 .64 -1.565105 .65 -1.558771 .66 -1.566217 .67 -1.573979 .68 -1.572288 .69 -1.576978 .7 -1.585979 .71 -1.577386 .72 -1.590643 .73 -1.602621 .74 -1.614616 .75 -1.618586 .76 -1.620776 .77 -1.642593 .78 -1.651891 .79 -1.65145 .8 -1.67225 .81 -1.679035 .82 -1.68725 .83 -1.69681 .84 -1.713983 .85 -1.735411 .86 -1.748733 .87 -1.7505 .88 -1.787683 .89 -1.825086 .9 -1.855017 .91 -1.877717 .92 -1.920807 .93 -1.966717 .94 -2.007466 .95 -2.03036 .96 -2.083133 .97 -2.080552 .98 -2.079567 .99 -2.073589 1 -2.059734 1.01 -2.064457 1.02 -2.06297 1.03 -2.054712 1.04 -2.046733 1.05 -2.035467 1.06 -1.980517 1.07 -1.931134 1.08 -1.87303 1.09 -1.84492 1.1 -1.772535 1.11 -1.738243 1.12 -1.711076 1.13 -1.690061 1.14 -1.688661 1.15 -1.6564 1.16 -1.639048 1.17 -1.612875 1.18 -1.616515 1.19 -1.615182 1.2 -1.602292 1.21 -1.606361 1.22 -1.592886 1.23 -1.587961 1.24 -1.588667 1.25 -1.589106 1.26 -1.585278 1.27 -1.583061 1.28 -1.597594 1.29 -1.587 1.3 -1.584314 1.31 -1.593732 1.32 -1.57675 1.33 -1.568833 1.34 -1.569056 1.35 -1.580579 1.36 -1.581014 1.37 -1.589667 1.38 -1.589833 1.39 -1.605773 1.4 -1.615956 1.41 -1.632 1.42 -1.6448 1.43 -1.6589 1.44 -1.66965 1.45 -1.673542 1.46 -1.689118 1.47 -1.670382 1.48 -1.6715 1.49 -1.6704 1.5 -1.661894 1.51 -1.659603 1.52 -1.662484 1.53 -1.6593 1.54 -1.649076 1.55 -1.651636 1.56 -1.637471 1.57 -1.642136 1.58 -1.622307 1.59 -1.611383 1.6 -1.599312 1.61 -1.582617 1.62 -1.567481 1.63 -1.5588 1.64 -1.565105 1.65 -1.558771 1.66 -1.566217 1.67 -1.573979 1.68 -1.572288 1.69 -1.576978 1.7 -1.585979 1.71 -1.577386 1.72 -1.590643 1.73 -1.602621 1.74 -1.614616 1.75 -1.618586 1.76 -1.620776 1.77 -1.642593 1.78 -1.651891 1.79 -1.65145 1.8 -1.67225 1.81 -1.679035 1.82 -1.68725 1.83 -1.69681 1.84 -1.713983 1.85 -1.735411 1.86 -1.748733 1.87 -1.7505 1.88 -1.787683 1.89 -1.825086 1.9 -1.855017 1.91 -1.877717 1.92 -1.920807 1.93 -1.966717 1.94 -2.007466 1.95 -2.03036 1.96 -2.083133 1.97 -2.080552 1.98 -2.079567 1.99 -2.073589 2003 season 0 -.3704936 .01 -.3801929 .02 -.3673431 .03 -.3848529 .04 -.317975 .05 -.3173784 .06 -.2525578 .07 -.2125536 .08 -.1848333 .09 -.1242134 .1 -8.380405E-02 .11 -3.503749E-02 .12 -2.403572E-02 .13 4.307691E-03 .14 2.229861E-02 .15 4.163636E-02 .16 .0421859 .17 5.377704E-02 .18 .0565 .19 .0332195 .2 .0273581 .21 2.489744E-02 .22 2.407237E-02 .23 9.628377E-03 .24 4.291669E-03 .25 2.691178E-03 .26 -1.340196E-09 .27 -3.993589E-03 .28 -1.500658E-02 .29 -8.192857E-03 .3 -2.471154E-02 .31 -1.205469E-02 .32 1.98718E-03 .33 -.0011875 .34 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1.61 .1452927 1.62 .1633954 1.63 .1552389 1.64 .1437143 1.65 .1454545 1.66 .1434695 1.67 .1346987 1.68 .1268807 1.69 .1248716 1.7 .1084097 1.71 .116829 1.72 .10915 1.73 8.970943E-02 1.74 .0717564 1.75 6.568918E-02 1.76 3.891251E-02 1.77 4.862791E-02 1.78 1.988971E-02 1.79 1.598718E-02 1.8 1.748889E-02 1.81 7.461954E-03 1.82 -.01664 1.83 -9.142044E-03 1.84 -.0113718 1.85 -2.434147E-02 1.86 -3.774359E-02 1.87 -4.879487E-02 1.88 -.0426369 1.89 -6.562879E-02 1.9 -.0735 1.91 -.10025 1.92 -.1381375 1.93 -.1897361 1.94 -.243079 1.95 -.2874188 1.96 -.292189 1.97 -.3566986 1.98 -.3653398 1.99 -.3689056 From jop at astro.columbia.edu Fri Jun 27 19:58:55 2003 From: jop at astro.columbia.edu (Joe Patterson) Date: Fri, 27 Jun 2003 19:58:55 -0400 (EDT) Subject: (cba:news) southern notes, mostly Message-ID: Dear CBAers, Coupla things. Time to call off the dogs on V803 Cen. This is now the best-observed superhumper in the sky... and although the star does show a few wrinkles not generally found in the H-rich superhumpers (e.g. the refusal of the humps to die), they're very well documented now. We also have a very accurate orbital period, testifying to the very small fractional superiod excess (0.41%). We've started to work on recent novae this year. In particular, Berto and Jennie have been observing V4743 Sgr (N 2002), and analysis shows a periodic signal probably at 3.59(+-0.01) c/day, but possibly at 2.59 c/day. It's weak and aliased, but we should be able to improve the significance and eliminate the impostor alias with some extensive coverage (long runs) from the south. Please consider it! Also on the subject of recent novae, I've noticed that I sent you the wrong period for V1494 Aql. For purists, the correct period is 0.1346163(3) d. The yearly waveforms are pretty much OK. We're getting decent coverage of V603 Aql from Lew Cook and David Messier... but not other longitudes. Help us out, it's a CBA green-light special! Officially moving back to New York City tomorrow morning, even though I keep an office here at Princeton for at least another year. And an ID so I can play on that lovely golf course! joe From jop at astro.columbia.edu Mon Jun 30 12:33:33 2003 From: jop at astro.columbia.edu (Joe Patterson) Date: Mon, 30 Jun 2003 12:33:33 -0400 (EDT) Subject: (cba:news) NSV 09923 Message-ID: Dear CBAers, As some of you know, Berto has found shiny new superhumps in NSV 09923, at around 2 hr period. It's ideally placed for all southerners, at 17 59 16.52 -42 35 6.8 (J2000.0) Have at it, from horizon to horizon! (Nearly.) joe