Affiliation
American Association of Variable Star Observers (AAVSO)
Thu, 09/04/2014 - 17:25
Hello All
Decided to start a new topic, now that EE Cep is out of minimum. As the campaign winds on, I am interested in hearing what TOM is calculated from the data. Using a very unconventional approach, I got 2456894.75xx. What's your TOM?
BTW: I redid my Transformations, and now it looks like my observations are no longer fainter than others. They seem to be right on. This only applies to pre minima data of mine. I am doing the post minima fixing today. I did not think that Tx on a 4 color chart with two magnitudes of range would show much. It did.
Gary
Here is another non-rigorous value TOM=894.4213
This was obtained by opening data in VStar, running a phase plot, visually selecting min V value and checking selected observation. Quite apparent since eclipse is very sharp if date range is wide enough!
Peranso and other software will work but need to get data downloaded in appropriate format?
Ken
For my non-rigorous estimate, I chose a 20 day window which visually seemed symmetric about the TOM from a vstar plot of raw VIS and V data. I then fit a parabola to the plot and determined TOM by inspecting the data for the model minimum value. I got ~6893.919.
Hello
I transformed my data from JD 6894 where the clear minim was seen in v. Now with BVRcIc, fitting a parabola to >8 hours of data that night, I am getting:
B = 6894.94
V = 6894.77 (was 6894.75 in v, untransformed)
Rc = 6894.83
Ic = 6894.92
Any other multi color Non Rigorous TOM's. How does it vary with color for you?
Gary
Looks like there is a subtle dip in curve between 9/1 and 9/6?? Interesting little change in dust cloud? T7 in Spain still seems to have the usual 3-4 observers still getting data. Great campaign, great data! Target will return to normal mag soon. ;-(
Ken
I have some unreduced data in that date range. I'll try to get that done ASAP.
I just uploaded my B and V filter data from 02.09 - 05.09 (all nights have at least one series of 5) to VPHOT, hopefully today night-tomorrow I can transform them as well.
Hi Ken,
I'm one of the usual 3-4 observers you mention in your post. I've been imaging EE Cep since July 30. I have one more image scheduled for Monday at 1am (I'm using T7 in Spain..the weather there has been fantastic for this campaign!). I'll have a total of 19 good images. I'll upload all of this to the light curve hopefully this coming week. That will probably be my last EE Cep image unless somebody thinks that it's worthwhile to do more imaging.
Dave (HDHA)
Dave:
I think it would be nice to continue until ee cep is back to normal mag! Not too much longer.
Ken
Ken,
I scheduled three more observations thru next Sunday on T7.
Dave
Hello Ken
I agree it would be great to follow this star for a while longer. In fact, another at least 40 days would be good. That would give and egress about like the dense ingress. Lets make the density equal on both sides of the eclipse, that way the data analysis will not be weighted to the early data.
BTW: The interesting bump is probably the other side of the gap in the disk--this gap is believed to cause the bump on the fading part of the eclipse.
Gary
Gary and Ken,
OK this is the feedback I was looking for! I'll continue to image for a 40 day period (hopefully the good weather will hold that long). I typically take an image about every other day at about the same time if the time slot is available (1-1:20 am Spain time). I use an Excel spreadsheet to track the progress.
I'll upload the data I have so far to the LC hopefully sometime this week.
Dave