CCD: FULL 13'x13'armin READOUT: ONE AMP (lower left or 11) GAIN INDEX: 4: Read Noise ~ 5.0 FILTER SET: ubvy plus ND1 ----------------------------------------------------------------------- NOTES FOR TARGET FIELDS ----------------------------------------------------------------------- 1. The observing run consists of u-band photometric monitoring of the variable B-type star HD 37017 (V=6.54). Stars in the surrounding field will be used as comparisons. 2. I think the exposure times should be around 30-60 seconds. Feel free to take exploratory exposures to ensure that the star does not saturate. 3. As the night progresses (and HD 37017 continues to rise), the exposure time may need to be shortened to prevent saturation. Likewise, later in the night (as HD 37017 starts to set), the exposure time may have to be lengthened. Ideally, in all target frames, the peak counts on HD 37017 should not be allowed to rise above 45,000, and likewise should not be allowed to drop below 20,000. 4. The surrounding stars are of similar magnitude. Please center the image above HD 37017, close to HD 37016, at RA = 05 35 21.87, Dec = -04 25 27.0 so as to include the A0 star HD 37040. The finder chart included takes this shift into account. In the finder chart, HD 37017 is the star in at the bottom center, 37016 above it in the center of the image, and 37040 up to the left. 5. Use full chip mode, and one amplifier readout. Please avoid using the upper left amplifier (2,1). 6. Please adjust exposure times to allow the stars into the count ranges mentioned above. If the exposure time for the target frames is too small (i.e. less than 20s, try using an ND2 filter and adjusting the exposure times accordingly) ----------------------------------------------------------------------- NOTES FOR CALIBRATION FIELDS ----------------------------------------------------------------------- 1. Please obtain 10 bias frames and 10 u-filter flat field frames at the start of each night. ----------------------------------------------------------------------- OBSERVING SEQUENCE ----------------------------------------------------------------------- TARGET HD 37017 PRIORITY 1 COORDINATES (star) 05 35 21.87 -04 29 39.0 (FK5 2000.0/2000.0 epoch) COORDINATES (telescope) 05 35 21.87 -04 25 27.0 (FK5 2000.0/2000.0 epoch) FINDER CHART http://aladin.u-strasbg.fr/alapre.pl?-c=HD+37016&button=N%26B AIRMASS Less than 2.5 FILTER(S) u INTEGRATION(S) See notes 2, 3, and 6 TOTAL TIME Continuous monitoring NOTES Any conditions acceptable