[Message Prev][Message Next][Thread Prev][Thread Next][Message Index][Thread Index]
[vsnet-chat 582] V651 Mon (summary of fading episode)
- Date: Sat, 6 Sep 1997 13:28:05 +0900 (JST)
- To: vsnet-chat
- From: Taichi Kato <tkato@kusastro.kyoto-u.ac.jp>
- Subject: [vsnet-chat 582] V651 Mon (summary of fading episode)
- Sender: owner-vsnet-chat@kusastro.kyoto-u.ac.jp
V651 Mon (summary of fading episode)
* The center of the fading was around 1997 February. The central star
was barely visibile.
* After removing the 16-day (orbital) variation, the midpoints of the
ingress and egress become 1996 November and 1997 May, respectively.
Thus it took about 6 months for the cloud core to pass in front of
the binary.
* Superimposed on this long-term obscuration episode, 16-day orbital
variation was observed as in the previous (1980's) fading.
* Notable was the brightness spike observed at the beginning of 1997
April, probably indicating the cloud was partially transparent here.
About 6+ month preceding this brightness spike, similar but _fading_
spike was observed in late 1996 September. It seems to be that the
obscuring cloud is not symmetrical, and that there may have been a
condensation in the moving (orbiting) direction of the cloud, and
a transparent patch behind the cloud core. Was the 6-month interval
a mere coincidence, or some sort of natural consequence?
* In 1980's, such fading episodes were said to be observed only once in
century, but the present "second" occurrence of such phenomenon may
indicate such episodes may occur more frequently. This star should
be monitored every clear night as many observers are doing for R CrB
stars.
* In a session of the IAU Meeting, the MACHO collaboration team reported
the discovery of a young Magellanic PNN which showed showed sporadic
fading episodes (I don't remember the name or other information).
This case may be a second example of PNNs showing temporary and changing
obscuration by the surrounding clouds.
Suggestions and comments are highly appreciated.
Regards,
Taichi Kato
--------------------------------------------------------------------------
YYMMDD(UT) mag observer
960806.7569 112 (A. Jones)
960810.7514 112 (A. Jones)
960811.7521 111 (A. Jones)
960816.7472 112 (A. Jones)
960822.7465 121 (A. Jones)
960822.7556 121 (A. Jones)
960823.7417 121 (A. Jones)
960824.7125 123 (A. Jones)
960824.7382 124 (A. Jones)
960826.7285 119 (A. Jones)
960828.7431 120 (A. Jones)
960830.7319 115 (A. Jones)
960906.7069 120 (A. Jones)
960910.7153 119 (A. Jones)
960914.1 113 (D. Overbeek)
960915.6778 112 (A. Jones)
960916.0 113 (D. Overbeek)
960916.7035 114 (A. Jones)
960918.7028 117 (A. Jones)
960919.6840 121 (A. Jones)
960920.7028 122 (A. Jones)
960921.6958 133 (A. Jones)
960923.6813 129 (A. Jones)
960924.7000 127 (A. Jones)
960925.101 125 (D. Overbeek)
960926.089 120 (D. Overbeek)
960926.7000 125 (A. Jones)
960927.738 120 (T. Watanabe)
960929.6847 116 (A. Jones)
961001.110 112 (B. H. Granslo)
961001.774 110 (T. Watanabe)
961005.778 121 (T. Watanabe)
961011.680 118 (T. Watanabe)
961017.710 110 (T. Watanabe)
961027.683 123 (T. Watanabe)
961108.141 139: (G. Poyner)
961109.095 136 (L. T. Jensen)
961109.735 <138 (T. Watanabe)
961110.139 <131 (G. Poyner)
961113.667 12.29V (S. Kiyota)
961114.250 134 (B. King)
961114.610 130 (T. Watanabe)
961114.822 12.96V (Ouda team)
961115.694 123 (T. Watanabe)
961116.640 121 (T. Watanabe)
961116.699 12.45V (Ouda team)
961119.747 12.88V (Ouda team)
961121.089 146: (G. Poyner)
961122.672 <136 (T. Watanabe)
961129.715 <139 (T. Watanabe)
961130.619 <135 (S. Takahashi)
961130.705 <139 (T. Watanabe)
961201.812 136 (T. Watanabe)
961202.062 131 (G. Poyner)
961202.822 131 (T. Watanabe)
961203.747 127 (T. Watanabe)
961204.000 120 (L. Kiss)
961205.067 124 (G. Poyner)
961206.765 126 (T. Watanabe)
961207.597 136 (T. Watanabe)
961209.589 13.62V (Ouda team)
961211.607 13.30V (Ouda team)
961213.966 132 (A. Diepvens)
961214.660 13.61V (Ouda team)
961215.631 139 (S. Takahashi)
961219.331 130 (L. E. Shaw)
961220.642 13.39V (Ouda team)
961221.544 13.24V (Ouda team)
961221.737 131 (T. Watanabe)
961223.051 138: (G. Poyner)
961223.550 13.90V (Ouda team)
961224.550 13.70V (Ouda team)
961225.576 13.30V (Ouda team)
961227.594 12.92 (Ouda team)
961230.578 13.34 (Ouda team)
961231.516 13.86V (Ouda team)
970101.071 <145 (G. Poyner)
970101.590 <135 (H. Itoh)
970101.628 13.77V (Ouda team)
970102.010 <139 (G. Poyner)
970102.533 13.67V (Ouda team)
970102.590 130 (N. Makiguchi)
970103.078 133: (G. Poyner)
970103.738 13.57V (Ouda team)
970103.792 137 (H. Itoh)
970104.469 13.17V (Ouda team)
970106.572 137 (H. Itoh)
970107.526 142 (S. Takahashi)
970109.644 133 (T. Watanabe)
970110.531 136 (S. Takahashi)
970112.594 12.60V (Ouda team)
970113.573 13.30V (Ouda team)
970114.238 132 (L. E. Shaw)
970115.044 141 (G. Poyner)
970115.444 136 (S. Takahashi)
970115.607 13.86V (Ouda team)
970117.494 <140 (S. Takahashi)
970118.572 <132 (T. Watanabe)
970125.587 134 (H. Itoh)
970125.975 142 (G. Poyner)
970126.925 143: (G. Poyner)
970128.928 144: (G. Poyner)
970201.647 <142 (T. Watanabe)
970202.799 <131 (B. Csak)
970202.924 <149 (G. Poyner)
970203.606 <142 (T. Watanabe)
970203.700 <131 (B. Csak)
970207.900 155: (G. Poyner)
970210.800 <127 (L. Kiss)
970211.667 <132 (T. Watanabe)
970214.001 <149 (G. Poyner)
970219.581 <132 (T. Watanabe)
970227.001 <134 (G. Poyner)
970227.440 <138 (S. Takahashi)
970227.548 14.26V (Ouda team)
970227.800 <131 (B. Csak)
970228.460 14.04V (Ouda team)
970228.906 <145 (G. Poyner)
970301.310 141 (L. Szentasko)
970301.433 <135 (S. Takahashi)
970301.537 14.06V (Ouda team)
970302.885 <139 (G. Poyner)
970305.466 14.26V (Ouda team)
970306.848 <145 (G. Poyner)
970308.488 14.16V (Ouda team)
970310.849 <139 (G. Poyner)
970311.448 13.85V (Ouda team)
970312.828 146 (G. Poyner)
970319.824 140: (G. Poyner)
970324.492 <134 (T. Watanabe)
970324.858 <139 (G. Poyner)
970326.874 <145 (G. Poyner)
970328.417 14.01V (Ouda team)
970329.865 146: (G. Poyner)
970330.421 13.26V (Ouda team)
970330.533 131: (T. Watanabe)
970331.430 12.92V (Ouda team)
970331.839 128 (G. Poyner)
970331.91 129: (AFOEV observations (via E. Schweitzer))
970401.421 12.24V (Ouda team)
970402.169 118 (R. J. Modic)
970410.858 <139 (G. Poyner)
970413.424 14.00V (Ouda team)
970414.438 13.96V (Ouda team)
970415.113 <142 (R. J. Modic)
970415.875 <139 (G. Poyner)
970426.469 131 (T. Watanabe)
970429.465 131 (T. Watanabe)
970505.482 119 (T. Watanabe)
970507.103 121 (R. J. Modic)
970510.455 133 (T. Watanabe)
970525.465 <114 (T. Watanabe)
970608.379 116 (F. Farrell)
970729.840 <120 (F. Farrell)
970803.157 113 (D. Overbeek)
970804.150 113 (D. Overbeek)
970904.421 111 (R. J. Modic)
970905.783 108 (T. Watanabe)
Return to Daisaku Nogami
vsnet-adm@kusastro.kyoto-u.ac.jp
VSNET Home Page