(cba:news) summer trinkets, and v sge
Joe Patterson
jop at astro.columbia.edu
Tue Jul 8 15:10:34 EDT 1997
Dear CBAers, July 7, 1997.
Great campaigns on DQ Her and V503 Cyg going on now. But the DQ Her
data, while of excellent quality, has pretty much told us everything we
want and/or could ever learn. Namely, there is a fairly but not
completely stable orbital waveform (see end of this letter), and
there is no superhump (unless it is <0.025 mag semi-amplitude, or
coincides with a 1-day alias to an accuracy <0.02 c/d). These are
solid results and mean that it's time to quit.
V503 Cyg is better. Although hanging around mag 17-17.5, the amplitude
of the 109 min signal is very large at 0.9 mag, so we get good timing
data anyway. At the end I attach one night's data from Bob Fried -
pretty impressive! We'd like to keep watching it throughout the
season, because we want to study the long-term timing effects. So
basically, let's pepper this star with occasional nightly time series
through December or so. We don't need the *continuous* coverage any
more. Avoid outburst and superoutburst; quite difficult to get useful
data then since the outbursting thing doesn't seem to know much about
the 109 m signal (as we discussed earlier in the Harvey et al. 1995
paper).
The most urgent and timely star is V Sagittae. This has been a low-
priority target for years now, so has never gotten done. Maybe ('fess
up) you folks have been scorning it because it's too bright to impress
the neighbors with. Anyway, I'm writing up the other results (X-ray,
spectroscopic, etc.) and it's now urgent to get a very dense time
series for a few weeks on it. Let's do it now! The star has also
cooperated by diving into a semi-low state (at magnitude 12.2); no
previous time series have been obtained with the star this faint. From
my reconaissance it looks like the most promising comp star is the
V=13.13, B-V=0.40 star located 3.1 arcmin ESE from the variable.
This is also a very good star for people new to our network, by the
way.
We still want to follow AM CVn and EC1533-1403 into the western
twilight. One-hour time series will suffice to yield acceptable pulse
timings under good conditions; two hours are needed under poor
conditions. I estimate late July is the end of both seasons, though
southerners (anyone down there still doing it?) could do mister EC for
4-6 more weeks.
Finally, there's our old friend RX1940-10. Too southerly for the
Europeans, and too faint for the small telescopes, but we want to keep
tracking the 3.3 hr wave through October 1.
Unfortunately our top three targets (V Sge, RX1940, V503 Cyg) have very
similar RAs. I suggest that the Europeans and smaller telescopes
should concentrate heavily on V Sge now, while the bigger scopes could
select between the other stars, with coverage of V Sge in bright time
(some coverage would be awfully nice to give a better longitude
spread). Anyway I am most psyched for V Sge precisely now because I'm
trying to get this paper beaten into shape.
Make me a happy man!
joe
Now here's the average orbital waveform of DQ Her over the last 17
days. It's a funny looking thing, not quite resembling the waveforms
recorded in the past. I dunno what to make of it.
Orbital phase, Delta mag:
.006 -2.6085
.016 -2.435063
.026 -2.189286
.036 -1.870052
.046 -1.631412
.056 -1.425606
.066 -1.263403
.076 -1.133649
.086 -1.069159
.096 -1.006228
.106 -.9204114
.116 -.8597136
.126 -.8597605
.136 -.8209498
.146 -.8256414
.156 -.8139953
.166 -.8286847
.176 -.8001378
.186 -.8108318
.196 -.803881
.206 -.800639
.216 -.7897092
.226 -.7730477
.236 -.7546591
.246 -.7684167
.256 -.7528352
.266 -.7376708
.276 -.7413386
.286 -.7403155
.296 -.7419331
.306 -.7468812
.316 -.7518453
.326 -.7286333
.336 -.7321488
.346 -.7189626
.356 -.7254566
.366 -.7047671
.376 -.6707221
.386 -.6900691
.396 -.6856071
.406 -.6696476
.416 -.6679889
.426 -.6645251
.436 -.6634535
.446 -.670595
.456 -.6636628
.466 -.6506196
.476 -.67495
.486 -.6660105
.496 -.6702794
.506 -.667255
.516 -.6633062
.526 -.6536176
.536 -.6525001
.546 -.6456429
.556 -.6538186
.566 -.6341058
.576 -.6419746
.586 -.6304075
.596 -.6410802
.606 -.6453045
.616 -.6325589
.626 -.6396251
.636 -.6439998
.646 -.6545833
.656 -.6713443
.666 -.6744501
.676 -.6956698
.686 -.69807
.696 -.6973623
.706 -.7061747
.716 -.6983125
.726 -.7062499
.736 -.6999118
.746 -.698948
.756 -.6847048
.766 -.6788549
.776 -.6885201
.786 -.6737176
.796 -.69029
.806 -.6916471
.816 -.6864895
.826 -.6916735
.836 -.69982
.846 -.7032041
.856 -.6814845
.866 -.6998351
.876 -.6894198
.886 -.708965
.896 -.7307091
.906 -.765516
.916 -.8349938
.926 -.932689
.936 -1.09568
.946 -1.309414
.956 -1.577079
.966 -1.891065
.976 -2.199688
.986 -2.4934
.996 -2.667965
1.006 -2.6085
1.016 -2.435063
1.026 -2.189286
1.036 -1.870052
1.046 -1.631412
1.056 -1.425606
1.066 -1.263403
1.076 -1.133649
1.086 -1.069159
1.096 -1.006228
1.106 -.9204114
1.116 -.8597136
1.126 -.8597605
1.136 -.8209498
1.146 -.8256414
1.156 -.8139953
1.166 -.8286847
1.176 -.8001378
1.186 -.8108318
1.196 -.803881
1.206 -.800639
1.216 -.7897092
1.226 -.7730477
1.236 -.7546591
1.246 -.7684167
1.256 -.7528352
1.266 -.7376708
1.276 -.7413386
1.286 -.7403155
1.296 -.7419331
1.306 -.7468812
1.316 -.7518453
1.326 -.7286333
1.336 -.7321488
1.346 -.7189626
1.356 -.7254566
1.366 -.7047671
1.376 -.6707221
1.386 -.6900691
1.396 -.6856071
1.406 -.6696476
1.416 -.6679889
1.426 -.6645251
1.436 -.6634535
1.446 -.670595
1.456 -.6636628
1.466 -.6506196
1.476 -.67495
1.486 -.6660105
1.496 -.6702794
1.506 -.667255
1.516 -.6633062
1.526 -.6536176
1.536 -.6525001
1.546 -.6456429
1.556 -.6538186
1.566 -.6341058
1.576 -.6419746
1.586 -.6304075
1.596 -.6410802
1.606 -.6453045
1.616 -.6325589
1.626 -.6396251
1.636 -.6439998
1.646 -.6545833
1.656 -.6713443
1.666 -.6744501
1.676 -.6956698
1.686 -.69807
1.696 -.6973623
1.706 -.7061747
1.716 -.6983125
1.726 -.7062499
1.736 -.6999118
1.746 -.698948
1.756 -.6847048
1.766 -.6788549
1.776 -.6885201
1.786 -.6737176
1.796 -.69029
1.806 -.6916471
1.816 -.6864895
1.826 -.6916735
1.836 -.69982
1.846 -.7032041
1.856 -.6814845
1.866 -.6998351
1.876 -.6894198
1.886 -.708965
1.896 -.7307091
1.906 -.765516
1.916 -.8349938
1.926 -.932689
1.936 -1.09568
1.946 -1.309414
1.956 -1.577079
1.966 -1.891065
1.976 -2.199688
1.986 -2.4934
1.996 -2.667965
And here's a recent nightly light curve of V503 Cyg, from Bob Fried.
JD, Delta Mag
636.68523 0.3623
636.68606 0.5261
636.68771 0.5597
636.68853 0.5820
636.68935 0.6049
636.69017 0.6624
636.69100 0.6805
636.69184 0.7788
636.69266 0.7142
636.69348 0.8009
636.69431 0.8383
636.69513 0.8277
636.69596 0.8231
636.69678 0.8814
636.69761 0.7855
636.69843 0.9931
636.69925 0.7617
636.70008 0.8202
636.70090 0.8272
636.70172 0.8875
636.70254 0.8192
636.70336 0.8838
636.70418 0.8139
636.70500 0.7260
636.70583 0.7558
636.70665 0.6817
636.70829 0.6678
636.70911 0.7819
636.70994 0.7157
636.71077 0.7011
636.71159 0.7881
636.71241 0.7246
636.71324 0.8373
636.71406 0.7977
636.71488 0.9810
636.71572 0.9564
636.71655 0.7972
636.71738 0.9237
636.71822 0.9426
636.71905 0.8774
636.71987 0.9376
636.72070 0.9701
636.72154 0.8686
636.72237 0.8922
636.72320 0.8059
636.72403 0.7186
636.72487 0.7186
636.72570 0.6938
636.72653 0.7320
636.72737 0.6906
636.72820 0.6584
636.72903 0.5607
636.72987 0.5680
636.73070 0.5999
636.73153 0.6121
636.73236 0.6749
636.73320 0.6489
636.73403 0.5885
636.73486 0.6085
636.73570 0.4678
636.73653 0.5080
636.73736 0.5009
636.73820 0.4877
636.73903 0.3900
636.73986 0.3174
636.74069 0.2803
636.74153 0.2084
636.74236 0.2408
636.74319 0.1654
636.74403 0.1510
636.74486 0.1807
636.74653 0.1037
636.74736 0.0506
636.74819 0.0394
636.74902 0.0544
636.74986 0.0143
636.75069 0.1312
636.75152 0.0696
636.75236 0.1681
636.75319 0.1018
636.75402 0.0483
636.75486 0.0602
636.75569 0.0943
636.75652 0.0846
636.75735 0.1093
636.75819 0.1025
636.75902 0.1320
636.75985 0.2150
636.76067 0.3630
636.76151 0.3757
636.76234 0.3556
636.76317 0.3758
636.76401 0.4248
636.76484 0.4234
636.76567 0.5385
636.76651 0.6139
636.76733 0.5298
636.76816 0.5464
636.76899 0.7228
636.76983 0.6640
636.77065 0.7192
636.77148 0.7470
636.77231 0.8482
636.77315 0.7478
636.77398 0.6973
636.77481 0.7288
636.77565 0.7844
636.77647 0.7377
636.77730 0.7985
636.77813 0.7551
636.77897 0.7258
636.77980 0.7891
636.78062 0.7427
636.78145 0.6914
636.78229 0.7912
636.78312 0.7059
636.78395 0.7496
636.78478 0.7110
636.78561 0.6536
636.78644 0.6694
636.78727 0.6675
636.78811 0.7223
636.78894 0.7442
636.78976 0.7416
636.79059 0.7755
636.79143 0.7535
636.79211 0.7584
636.79294 0.7616
636.79377 0.7988
636.79461 0.7177
636.79544 0.7229
636.79627 0.8011
636.79711 0.7832
636.79794 0.7517
636.79877 0.7590
636.79961 0.7259
636.80044 0.6560
636.80127 0.5395
636.80210 0.5181
636.80294 0.5380
636.80377 0.5906
636.80460 0.4688
636.80544 0.4768
636.80627 0.5205
636.80710 0.5310
636.80794 0.5762
636.80877 0.5170
636.80960 0.4713
636.81043 0.4652
636.81127 0.4992
636.81210 0.4984
636.81293 0.4029
636.81377 0.4274
636.81460 0.3599
636.81543 0.3653
636.81627 0.3221
636.81710 0.3457
636.81793 0.3523
636.81876 0.3034
636.81960 0.2517
636.82043 0.2346
636.82126 0.1790
636.82210 0.1424
636.82293 0.1535
636.82376 0.1469
636.82459 0.1023
636.82543 0.1082
636.82626 0.1400
636.82709 0.1084
636.82793 0.0812
636.82876 0.1174
636.82959 0.1644
636.83043 0.0872
636.83126 0.0683
636.83209 0.1515
636.83292 0.1576
636.83375 0.1550
636.83458 0.1775
636.83541 0.2310
636.83625 0.2248
636.83708 0.2431
636.83791 0.3185
636.83873 0.4270
636.83955 0.4291
636.84039 0.4464
636.84122 0.5566
636.84204 0.5887
636.84286 0.5421
636.84370 0.5699
636.84453 0.6680
636.84536 0.6114
636.84618 0.6800
636.84700 0.7905
636.84784 0.7784
636.84867 0.7095
636.84949 0.7680
636.85031 0.7324
636.85115 0.8004
636.85198 0.7166
636.85281 0.8041
636.85363 0.7853
636.85446 0.7199
636.85529 0.6495
636.85612 0.6767
636.85694 0.8032
636.85776 0.7002
636.85859 0.6678
636.85941 0.7388
636.86023 0.6739
636.86105 0.7184
636.86187 0.7084
636.86269 0.8011
636.86353 0.7156
636.86435 0.7755
636.86517 0.7568
636.86599 0.7079
636.86682 0.7993
636.86764 0.7604
636.86929 0.6356
636.87011 0.7326
636.87093 0.6558
636.87176 0.6792
636.87258 0.7327
636.87341 0.7851
636.87423 0.7243
636.87506 0.7401
636.87588 0.7124
636.87670 0.6426
636.87752 0.6189
636.87835 0.6183
636.87917 0.5181
636.88000 0.4910
636.88082 0.3858
636.88164 0.4540
636.88330 0.4164
636.88412 0.4295
636.88494 0.4583
636.88659 0.4798
636.88742 0.3626
636.88824 0.3964
636.88907 0.3763
636.88989 0.3957
636.89071 0.3592
636.89153 0.3443
636.89237 0.3439
636.89319 0.2949
636.89401 0.3154
636.89483 0.2707
636.89567 0.2962
636.89649 0.1703
636.89732 0.1425
636.89814 0.1333
636.89897 0.1341
636.89981 0.0182
636.90063 0.0879
636.90146 0.0261
636.90230 0.0008
636.90312 0.0376
636.90394 0.0827
636.90477 0.0483
636.90560 0.0484
636.90644 0.1070
636.90727 0.1041
636.90810 0.0915
636.90892 0.0873
636.90976 0.1282
636.91059 0.1000
636.91142 0.1693
636.91224 0.2195
636.91307 0.3063
636.91473 0.3198
636.91556 0.3796
636.91640 0.4504
636.91806 0.5047
636.91890 0.6488
636.91973 0.6367
636.92056 0.5724
636.92140 0.6821
636.92223 0.6510
636.92306 0.6755
636.92389 0.7290
636.92473 0.7350
636.92556 0.7272
636.92639 0.7672
636.92723 0.7946
636.92806 0.8131
636.92889 0.8473
636.92973 0.8316
636.93056 0.8630
636.93139 0.8082
636.93222 0.8287
636.93306 0.8112
636.93389 0.7710
636.93472 0.8072
636.93556 0.8684
636.93639 0.8517
636.93722 0.9159
636.93806 0.7806
636.93889 0.6996
636.93972 0.7412
636.94055 0.8153
636.94139 0.7204
636.94222 0.8040
636.94305 0.7580
636.94389 0.7844
636.94472 0.9135
636.94555 0.9052
636.94639 0.8043
636.94722 0.7883
636.94805 0.8206
636.94888 0.8461
636.94972 0.8585
636.95055 0.8386
636.95138 0.8470
636.95222 0.8030
636.95305 0.7383
636.95388 0.6871
636.95472 0.7119
636.95555 0.6541
636.95638 0.6610
636.95721 0.5663
636.95805 0.5832
636.95888 0.5583
636.95971 0.5177
636.96055 0.6400
636.96138 0.6805
636.96221 0.5526
636.96305 0.4863
636.96388 0.4567
636.96471 0.4183
636.96554 0.3341
636.96638 0.4192
636.96721 0.5018
636.96804 0.5650
636.96888 0.4369
636.96971 0.6045
636.97054 0.4341
636.97137 0.3702
636.97221 0.2012
636.97304 0.2422
636.97387 0.2369
636.97471 0.1670
636.97554 0.1546
636.97637 0.0699
636.97721 0.3251
636.97804 0.2542
636.97887 0.3291
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