CCD: FULL 13'x13'armin READOUT: ONE AMP GAIN INDEX: 3: Read Noise ~ 3.5 FILTER SET: UBVRI ----------------------------------------------------------------------- NOTES FOR TARGET FIELDS ----------------------------------------------------------------------- 1. Make sure that the focus is good. 2. Check to make sure that the coordinates are correct. 3. Take the exposures. Do not worry about saturated stars in the long integrations. (In each filter there is a long and a short exposure. This is to get data for both bright and faint stars.) 4. Check first image against finding chart to ensure that the field centre is correct (NB the fields include a number of known cluster members, so centering to an accuracy of 20-30 arcseconds is sufficient) 5. This program aims to monitor stars in young open clusters to look for flares. The prime target is IC 2391. The observing sequence lists three fields in that cluster. The observer should cycle through those three fields (i.e. field 1, then field 2, then field 3, then back to field 1, etc.) as long as IC 2391 is above an airmass of 2.2. 6. When IC 2391 descends below airmass 2.2, please switch to observations of NGC 5617. Note that all of the finding charts are on the same web page. ----------------------------------------------------------------------- NOTES FOR CALIBRATION FIELDS ----------------------------------------------------------------------- Please take a series of bias frames and dome flats in U and I It is not necessary to observe standard fields, since a) the target fields include stars with reliable photometry b) the prime aim is to obtain time-resolved differential photometry to look for variability in star cluster members ----------------------------------------------------------------------- OBSERVING SEQUENCE ----------------------------------------------------------------------- TARGET IC2391_1 PRIORITY 1 COORDINATES 08 41 08.2 -52 38 06 FINDER CHART http://www.stsci.edu/~inr/ic2391.html AIRMASS no more than 2.2 FILTER(S) I, I, U, U INTEGRATION(S) 10s, 40s, 100s, 700s TOTAL TIME 30 minutes NOTES any conditions acceptable TARGET IC2391_2 PRIORITY 1 COORDINATES 08 37 37.0 -53 3 45 FINDER CHART http://www.stsci.edu/~inr/ic2391.html AIRMASS no more than 2.2 FILTER(S) I, I, U, U INTEGRATION(S) 10s, 40s, 100s, 700s TOTAL TIME 30 minutes NOTES any conditions acceptable TARGET IC2391_3 PRIORITY 1 COORDINATES 08 41 43.7 -53 25 52 FINDER CHART http://www.stsci.edu/~inr/ic2391.html AIRMASS no more than 2.2 FILTER(S) I, I, U, U INTEGRATION(S) 10s, 40s, 100s, 700s TOTAL TIME 30 minutes NOTES any conditions acceptable TARGET NGC 5617_1 PRIORITY 2 COORDINATES 14 29 48.0 -60 43 00 FINDER CHART http://www.stsci.edu/~inr/ic2391.html AIRMASS no more than 2.2 FILTER(S) I, I, U, U INTEGRATION(S) 10s, 40s, 100s, 700s TOTAL TIME 30 minutes NOTES any conditions acceptable