I’m going to be giving a talk at NEAIC this year, and would like to show a time series that I took of V601 Dra. This is the time series in the Szkody et al (2004) paper discussing the 3rd set of CVs that we discovered in the SDSS survey. The time series is about 60 images taken with the 1m telescope at USNO-Flagstaff. I’d like someone to make a movie/animated gif of the 60 images that I could display, as this is a deep eclipsing system. The images are 1024x1024 pixels, but I’d like to trim it down to the center 500x500, and then perhaps display one image every second and repeat. I know it is not too difficult to do this, but someone out there has better tools than I do and more time before the meeting than I have! If anyone is interested, I’ll give them a link to the images.
If you know a python programmer:
If you have MaxIM, it will play a video and you can zoom in and play a single star. Good for watching scintillation.
Maxim will also save as .png and those can go to ffmpeg.
https://www.ffmpeg.org/documentation.html
Caveat: If I actually had done this before I would do it for you.
Ray
Arne,
I’d be happy to do this for you if you haven’t found another resource yet. Wouldn’t take terrible long either.
Mike
Hi Mike,
Sounds good - give it a try! Beware - I may ask for one or two revisions, after the initial movie is made.
Here is the dropbox link: https://www.dropbox.com/scl/fo/kr29pa2mdpjze8l3aft5l/AOQ5ObSl4uODJhCHkgbLlWU?rlkey=emej2mys32qg9axxfqt020648&st=vi1t98qk&dl=0
The files are FITS, but in bzip2 compression (my default). I can change that if you don’t find a tool that will uncompress that format.
The star is at pixel 505,453. A cutout of about 500x500 pixels centered on this would probably display the variation the best (enough nearby stars that show no variation, plus the eclipsing guy, which undergoes two eclipses during this time series).
These images are 4min exposures, unfiltered, with the USNO-FS 1m telescope. With these thinned, backside illuminated sensors, you get fringing, which is pretty obvious near the edges of the sensor. That is another reason for the 500x500 cutout. The star itself is about 19th magnitude.
Arne
As requested, two videos are attached. Each is a full run through of the data set at 1 frame per second, centered on V0601 Dra. Frame size is a smidge over 500x500.
One video contains dark sky background, the other is inverted.
Happy to make whatever changes you’d like to see.
Mike
Thanks, Mike! These look wonderful. I’ll get back to you if I need any changes.
Arne