Position from SIMBAD
RA, Dec (J2000) 16 13 18.7377 +06 02 15.537
Michael Koppelman, 2003 May 8
OK, I looked at HD 145913 last night. Check out my data here: http://www.lolife.com/astronomy/hd145913/ I have some multicolor data, too. What I did was do BVRI for an hour then high time resolution in R for an hour, and then another hour in BVRI. My S/N was very high. For the program star it was (according to Mira) 800 or so. It was not saturated. The integrations in Rc was 30 seconds. The standard deviation in the comp stars was 0.005. The standard deviation of the program star was 0.008. There is a slight period to this flicker (13 minutes and 4.5 minutes), but it could just be noise. I would for sure call it noise except that, according to Mira, the errors are very low. The standard deviation in the comp stars is 0.005. The amplitude of the program star is 0.04, which is damn small but still 8 times the 1-sigma error and almost 3 times the 3-sigma error. So maybe it is flickering. I had an exchange with Joe Patterson of the CBA (on another matter) and he had stated "Virtually all CVs flicker erratically on timescales of 1-3 minutes, so if your time resolution is much worse than ~40 s, you become blind to this and it appears merely as unwanted noise (which can be quite large, even ~0.2 mag)." This is what caused me to look at such short periods. This star is A5, so it's not red. I'm not claiming it's a CV and it's probably just noise and can be crossed off the list for a short period 0.2 mag eclipser that John thought it might be (see below). I don't know.