HPOL target data
Be Star Atlas
People Fits Files
UW Astron Dept
The HPOL spectropolarimeter is a modified Boller and Chivens small telescope spectrograph. The system provides simultaneous spectrophotometry and spectropolarimetry over the range of 3200A to 10500A (prior to 1995, the spectral range was 3200A to 7750A), with a spectral resolution of 10A (25A prior to 1995). The halfwave plate is a super-achromatic half-wave retarder. The wave plate is rotated by a stepper motor and rack and pinion drive, with stops every 11.25 degrees. A Wollaston prism produces two orthogonally polarized beams (ordinary and extraordinary) separated perpendicular to the dispersion. The ultraviolet achromatic camera is specifically designed for this instrument. The camera is all-refractive, which eliminates vignetting and thus enhances the polarimetric stability. The image is focused on a 400 X 1200 pixel CCD. Through 2004, the instrument was primarily installed as a dedicated intrument to the 36" telescope at the University of Wisconsin-Madison Pine Bluff Observatory (PBO). HPOL was also mounted on the 3.5 m WIYN telescope at Kitt Peak National Observatory for limited observational runs once a year or so. HPOL stopped taking data at PBO in October 2004 due to hardware problems.
HPOL no longer resides on the 36" telescope at Pine Bluff Observatory. It was relocated to Ritter Observatory, a 1-meter telescope at the University of Toledo run by the Ritter Astrophysical Research Center and refurbished. This project is led by Dr. Karen Bjorkman (University of Toledo), Dr. Jennifer Hoffman (University of Denver) and Dr. James Davidson (University of Toledo).
HPOL has been in operation at the University of Toledo's Ritter Observatory, with 'first' light on March 11th, 2012. Observations for testing and calibration purposes have been a focus up to this point. HPOL is currently operational in 'medium mode'. Examination of calibration observations at Ritter are comparable to PBO. A final polarization calibration for the first year of observations along with a Ritter atmospheric extinction curve will be ready soon. 'faint mode' operations are planned to be up and running in the future. Normal hit-list observing will begin soon.
Fits files and ASCII files for HPOL data taken from February 1989 through
March 4, 2000
can be obtained
from the Mikulski Archive for Space Telescopes (MAST) .
HPOL ProgramsInterstellar Medium (ISM)
Be Stars (Be) - A Spectropolarimetric Atlas of 61 Northern Be Stars-Vol. 1 (1989-1994 Results)
Luminous Red Variables (LRVs)
Hot Super Giants (OBsg)
Interacting Binaries (IntBin)
Herbig Ae/Be stars (AeBe)
Solar System objects including planets, comets, moons, and asteroids (Sol-Sys)
Wolf-Rayet stars (WR)
Symbiotic stars (Symb)
Pol and Unpol Standards (Pol-St, Unpol)
Miscellany (all other targets of interest)
The HPOL target database
was last updated Aug 7, 2013.
This plot shows all HPOL observations in galactic longitude and latitude.
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