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    Quote Originally Posted by Bob Denny View Post
    I had to give up on photometry for now. Work just takes too much out of me. Last night I took data in the hopes of calibrating the 24" and the extinction images at transit have lower intensities than the ones at higher airmasses, so that was a bust.
    Here's an example of quick/easy science that you can do...without all that calibration stuff. No filter needed, just bias, dark, flat calibration.

    Some of us are taking data for IPHAS 0627+0148, a cataclysmic variable where the white dwarf rotates every 37 minutes or so. It's also an eclipsing system - happens about every 8 hours.

    Our data helps update the orbital ephemeris since we captured an eclipse. But with some frequency analysis/processing of the data...the principal investigator has removed the eclipse and slow rise/fall/flickering (typical in many CV's)...and shown that we clearly captured the 37-minute white dwarf rotation.

    This was taken with a C-11, unfiltered, 120-second exposures. (The variable was about mag 16 - in it's 'bright' state.)

    Bob, it's hard for you to corral that 24-inch for 8 hours...but in 1 or 1.5 can take enough data to help refine/update things like white dwarf rotation in cataclysmic variables.

    Some pro's would be very happy to have that data from time to time. Mike Rice will be happy that you don't tie up the scope all night. And you don't need to spend hours determining extinction and transformation coefficients.

    Three attachements:
    1. Light curve, showing eclipse

    2. Power spectrum (with orbital frequency removed), showing the white dwarf rotation at about 40 cycles/day

    3. Light curve, detrended (low-freq. variations removed), and phase plotted/wrapped at the 37-minute white dwarf rotation period.

    Tom Krajci
    Cloudcroft, New Mexico

    Center for Backyard Astrophysics (CBA) CBA New Mexico

    American Association of Variable Star
    Observers (AAVSO): KTC
    Attached Images Attached Images



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