Polarimetry Standard Stars - Observing Method and Star List
The following is a quick summary of the method of observation of polarimetric standards with Mimir and the list of standards recommended for Mimir use.
[updated as of 2007/09/27 - DPC] - especially note the coordinate fields containing multiple standards
[further updated 2009/01/13 - DPC] - note doubles ("- D") among the standards, detected by Mimir
The primary list of polarimetric standard stars is drawn from Whittet, Martin, Hough, Rouse, Bailey, & Axon (ApJ, 386, 562 - 1992). These stars span a brightness range at H-band of 6-9th mag so the observations take very little time to execute (about 10 minutes total per standard).
At least one standard should be observed each night polarimetry is performed, with at least 4-5 different standards observed at least once in an observing run.
The procedure to observe a polarimetric standard is:
In order to map the instrumental polarization across the field of view of Mimir, observations of globular clusters away from the galactic plane are recommended. This should be done once per observing run, but not nightly.
The list below is a subset of the Whittet et al. 1992 list, and all polarimetric values are theirs. This list has been chosen based on Mimir observations, which revealed some binaries in the original Whittet list and so not ideal for use, and the desire to sample the range of percentage polarization and polarization position angle - these are needed to establish instrumental polarization, polarization efficiency, and HWP offset angle. Estimated integration times are approximate for F/5 observations.